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1 Mutant p53 as an Antigen in Cancer Immunotherapy
Navid Sobhani
 + 10300 word(s) 10300 2020-06-12 08:41:43 |
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Catherine Yang
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Sobhani, N.; D’angelo, A.; Wang, X.; Young, K.H.; Generali, D.; Li, Y. Mutant p53. Encyclopedia. Available online: https://encyclopedia.pub/entry/1151 (accessed on 25 April 2024).
Sobhani N, D’angelo A, Wang X, Young KH, Generali D, Li Y. Mutant p53. Encyclopedia. Available at: https://encyclopedia.pub/entry/1151. Accessed April 25, 2024.
Sobhani, Navid, Alberto D’angelo, Xu Wang, Ken H. Young, Daniele Generali, Yong Li. "Mutant p53" Encyclopedia, https://encyclopedia.pub/entry/1151 (accessed April 25, 2024).
Sobhani, N., D’angelo, A., Wang, X., Young, K.H., Generali, D., & Li, Y. (2020, June 20). Mutant p53. In Encyclopedia. https://encyclopedia.pub/entry/1151
Sobhani, Navid, et al. "Mutant p53." Encyclopedia. Web. 20 June, 2020.
Mutant p53
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This entry is adapted from the peer-reviewed paper 10.3390/ijms21114087

The p53 tumor suppressor plays a pivotal role in cancer and infectious disease. Many oncology treatments are now calling on immunotherapy approaches, and scores of studies have investigated the role of p53 antibodies in cancer diagnosis and therapy. This review summarizes the current knowledge from the preliminary evidence that suggests a potential role of p53 as an antigen in the adaptive immune response and a monitoring key role of the innate immune system, thereby speculating on the idea that mutant p53 antigens serve as a druggable target in immunotherapy. Except in a few cases, the vast majority of published work on p53 antibodies in cancer patients use wild-type p53 as the antigen to detect these antibodies and it is unclear that they can recognize p53 mutants carried by cancer patients at all. We envision that an antibody targeting a specific mutant p53 will be effective therapeutically against the cancer carrying the exact mutant p53. Thus, novel antibodies targeting mutant p53, but not the wild-type isoform, should be pursued in preclincial and clinical studies.

p53 serum antibodies tumor-suppressor immunoncology cancer

1. Discovery of p53

Approximately 70 years ago, several DNA viruses such as adenovirus, human Epstein–Barr virus, polyoma and SV40 were found to be able to cause tumors in humans and rodents [1]. In all of these cases, the viral proteins which stem from the viral genome—either integrated into a chromosome or as plasmid—were observed to be involved in tumor promotion, formation and maintenance [2][3][4]. These viral proteins—subsequently named tumor antigens (TA)—were recognized by the immune system and the different antibodies were found to target them specifically [5]. Given this scenario, in 1979, four different groups in England, the United States, and France nearly simultaneously discovered the p53 protein in normal and cancerous cells, testing the serum from animals with spontaneously derived or SV40 virus-induced tumors [6][7][8][9]. Among these four studies, the same 53kD protein (called p53) was detected—and confirmed with peptide maps—in SV40-transformed cells and malignant cells that are not transformed by a virus, whereas decreased p53 levels were observed in uninfected normal cells. Malignant cells that were not transformed by any virus also had increased levels of p53, suggesting that the SV40 tumor antigen, a well-known factor for the tumor initiation and progression, binds to p53 and raises its concentration above its normal levels in control healthy cells [10]. These preliminary results paved the way for a vast number of studies on the role of cellular protein p53 in the cancer biology field, leading to the discovery that p53 mutations are the most common genetic alteration in human cancers.

2. Tumor Suppression Role

p53 has a unique and unequivocal tumor suppression role, which has been confirmed by the cancer susceptibility of individuals affected by Li–Fraumeni syndrome, the p53 inactivation in most sporadic human cancers, and the spontaneous tumorigenesis in mice with the p53 gene knocked out [11]. During tumor development, inherited and/or sporadic TP53 genetic missense mutations are normally followed by a loss of heterozygosity (LOH), turning into an entire p53 deficiency. It seems there is a selective advantage towards the loss of the remaining allele of the wild-type p53 (p53-wt) gene [12][13][14]. The loss of p53 gives way to the initiation and progression of malignancies, which are generally characterised by more malignant features such as intensified invasiveness and metastatic capability, genetic instability and poor cellular differentiation [15][16][17][18]. In all likelihood, these outcomes are given not only by the loss-of-function (LOF) of wild-type p53 (p53-wt) but also by the tumorigenic gain-of-function (GOF) features of some p53 mutants (p53-mut) described later.

p53 is known as the “guardian of the genome” thanks to its capacity to respond to outside stresses, which promotes transient or permanent cycle arrest and apoptosis, following different stress factors including hypoxia, DNA impairment, oxidative stress, hyperproliferative signals, nutrient shortage [19][20][21]. p53 supports tumor suppression through its roles as transcription factor and mitochondrial membrane permeabilization (to trigger apoptosis) and, indeed, the most investigated biological activity of p53 is its transcriptional activator role [17].

3. Transcriptional Role of p53, Relevant Mutations and the Mutant p53 GOF

In common with other transcription factors, p53 is composed of three distinct domains, which are responsible for oligomerization, transcriptional activation and sequence-specific DNA-binding [22][23]. Although the carboxy-terminal domain has been shown to play a pivotal role for the tetramerization of p53 monomers—which, in turn, triggers transcriptional activation—approximately 30% of TP53 mutations in human malignancies occur in six “hotspot” amino acid residues within the DNA-binding domain (R175, G245, R248, R249, R273 and R282). Such alterations in malignancies highlight the crucial role of p53 as a transcription factor in tumor suppression [24][25]. Together with the well-established tumorigenic promotion via loss of p53-wt function, the retained p53-mut is also thought to promote tumorigenesis via GOF properties and a dominant negative effect on the p53-wt protein [19][26]. After showing malignant characteristics such as increased survival and invasiveness, a poor differentiation rate and proliferation in preliminary cell culture studies, the GOF of tumor-derived p53-mut was corroborated by knock-in mice studies. In these studies, different mice strains harboring equivalent human tumor p53-mut (e.g., p53273H, p53R248Q, p53R248W, p53175H and p53G245S) reported a shorter tumor latency, a wider tumor spectrum and a higher rate of metastasis, supporting the concept that p53-mut actively sustains cancer development and progression [13][17][28][29][30]. p53 GOF could be attributable to an increase in the interaction with other transcriptional factors such as the vitamin D receptor (VDR), the nuclear factor Υ (NFΥ) and p63 and p73 [31][32], resulting in the alteration or inhibition of the DNA-binding capacity of these transcription factors [33][34]. Lastly, p53-mut has been observed to interact with the Nijmegen breakage syndrome protein 1 (NBS1), Meiotic Recombination 11 (MRE11) and DNA repair protein RAD50 (RAD50), to make a complex (NBS1-MRE11-RAD50) and impair the DNA damage signalling [35][36].

p53 Degradation and Accumulation

The p53 transcription factor is part of an autoregulatory loop where p53 protein promotes the expression of Mouse double minute 2 homolog (MDM2) protein, which, in turn, polyubiquitinates the p53 protein and supports its degradation [10][37]. Yue et al. showed that BAG family molecular chaperon regulator 2 (BAG2) binds to p53-mut and translocates it into the nucleus to inhibit the interaction between MDM2 and p53, thus blocking the MDM2-mediated ubiquitination and degradation of p53. They further reported that the DBD of the p53-mut and the BAG domain of the BAG2 are essential for the BAG2-p53-mut interaction. Noteworthily, different models expressing p53-mut, that lacked the main sites for p53 ubiquitination by MDM2, still showed a normal half-life and stabilization for p53 under stress conditions [38][39]. In fact, there are alternative pathways involved in the degradation of p53. Benchimol et al. showed, for the first time, that MDM2 is not the only E-3 ligase capable of controlling p53 ubiquitination [40]. There are many different E3 ligases targeting p53 for ubiquitin-mediated degradation and their description is out of the scope of this review. For a more thorough description of such molecules involved in p53 degradation we refer to tailored reviews [41][42]. Briefly, the following are E-3 ligases involved in p53 ubiquitin-mediated degradation that mediate the K48-linked polyubiquitination of p53, marking the protein for proteosomal degradation: MDM2, Fogol Caspase Recruitment Domain-Containing protein 16 (COP1) and Ring Finger And CHY Zinc Finger Domain Containing 1 (Pirh2), as well as Tripartite Motif Containing 24 (TRIM24) [43], TOP1 Binding Arginine/Serine Rich Protein (TOPORS) [44], WW Domain Containing E3 Ubiquitin Protein Ligase 1 (WWP1) [45], ADP ribosylation factor–Protein oikybromo-1 (ARF-BP1) [46], Ubiquitin-conjugation enzyme E2 13 (Ubc13) [47], Human Herpes Virus Infected Cell Polupeptide 0 (ICP0) [48], Cell Division Cycle And Apoptosis Regulator 1 (CARP1/2) [49], Cullin 7 (CUL7) [50], Synoviolin (SYVN) [51], E4F Transcription Factor 1 (E4F1) [52], STIP1 Homology And U-Box Containing Protein 1 (CHIP) [53], E4orf6 and E1B55K [54], MSL Complex Subunit 2 (MSL2) [55], F-Box Protein 42 (JFK) [56] and Makorin Ring Finger Protein 1 (MKRN1)  [56]. Notably, mono- or K63-linked polyubiquitination is linked to other functions besides ubiquitination, such as nuclear and cytosolic localization, alterations of p53 transcriptional levels. Nuclear export is induced by conjugating with ubiquitin by MDM2, MSL2 and WWP1; ICP0 was shown to accumulate ubiquitin p53 at nuclear foci; E4F1, was shown to active cell-cycle arrest at G0/G1 after mono-di or tri- ubiquitinating p53; CUL7 was shown to mono- or deubiquitinate p53 to repress p53 transcriptional activity by unknown mechanisms [45][48][50][52][55]. Therefore, there are different mechanisms by E3 ligases to fine-tune the levels of p53 in cells. However, none of these E3 ligases has been studied in detail as much as MDM2. p53 mutated proteins do not activate the expression of MDM2. In consequence, such mechanisms of degradation do not occur in p53-mut where MDM2 levels are very low [57]. Therefore, this has been postulated as an explanation of why only p53-mut bearing patients result in the formation of p53 antibodies (p53-Abs).

The accumulation of p53 can be triggered by many mechanisms, such as stress signals, DNA damage, nucleotide deprivation, DNA damage, mitogenic or oncogenic activation viral infection, heat shock proteins like HSP70/HSP40/HSP90, which, in cancer cells, form a multi-chaperone complex around p53-mut facilitating the unfolding of the p53-mut and its spontaneous folding to another conformation with different energy minimum [58][59][60] (Figure 1). In addition, the activity of p53 can be further enhanced by post-translational modifications working as positive or negative regulators [6][58][61][62].

Ijms 21 04087 g001 550

Figure 1. Mechanisms of regulation of wild-type p53 (p53-wt) and p53 mutants (p53-mut) and the potential role of p53 antibodies (p53-Abs).

4. p53-Abs measurements and specificity

There are several methods for the measurement of p53-Abs from specimens, such as ELISA [63][64], Western blot or Immunoprecipitation[65][66], possibly explaining why results are different in the literature regarding the frequency of p53-Abs. Additionally there are different types of epitopes recognized by these assays. The p53-Abs usually recognizes immunodominant epitopes found in the COOH and NH2 termini of p53. Therefore it is crucial to have valid systems recognizing the entire p53 protein, looking at both sides [67].

The structure of p53 has been already been established by X-ray crystallography. The protein has a central region made of 102-292 amino acids[89]. This includes two β-sheets antiparallel motifs made of 4 and 5 β-strands, respectively. Moreover, these strands form a structure that keeps together the protein: 1) LSH with and α-helix, three β-strands and the L1 loop; 2) L2 loop with smaller helix; 3) L3 loop made of turns. The region involved in the DNA interaction is the LSH motif and L3 helix. According to Suossi et al, these two loops stabilize the protein structure by binding with each other by a zinc atom connected to Cys176 and His179 on the L2 loop and Cys278 and Cys242 on the L3 loop [68][69]. Additionally the central region of p53-wt is held in a compact conformation by two antiparallel β-sheets. This specific conformation is hydrophobic and poorly immunogenic [68]. Some key epitope residues used by anti-p53 Abs correspond to those needed for the MDM2 interaction with NH2 terminus of p53 [7].

p53 antibodies could be specific to at least one conformation of p53-mut. Interestingly, there are some publications showing that p53-Abs are able to recognize not only the p53-mut but also the p53-wt [70][71][72] . The epitopes of human p53 were precisely mapped [73]. From the analysis of more than 200 sera it was possible to evince that the immune-dominant epitopes were on the COOH terminus of human p53 and a much less extent very few antibodies recognized the human p53 central region [71][73][74][75].

5. p53-Abs in Cancer Patients

The first population study looking at s-p53-Abs produced by human cancer patients relates back to 1982, where it was demonstrated that p53-Abs were found in 10% of the sera of breast cancer women [66]. More studies on various cancers came afterwards proving that in about 30% of different types of cancers p53-Abs were detected [69].

The s-p53-Abs has been found in patients with head and neck cancer, ovarian cancer ascites’ fluids, pancreatic, colon and lung tumors pleural effusions, and saliva from oral cancer patients [69][76][77][78][79]. As expected, there is a high correlation between the s-p53-Ab and the frequency of p53 gene alterations in the tumors [63][70][77][78][80][81][84,92,100,101,103,104]. In mesothelioma and prostate cases where p53-mut were low, the presence of s-p53-Abs was low [82]. Tavassoli et al showed that p53 was detected in both saliva and sera of 29 oral SCC patients [78]. Angelopoulou et al analysed 96 ascites fluids from women with primary ovarian cancer for s-p53-Abs. They showed that autoantibodies were present in both serum and ascites of 6/30 patients; of them 22 were negative for auto-antibodies in either serum or ascites, and 2 had them only in the serum [77].

Suoussi et al made a meta-analysis of 18 clinical studies, pulling down 9,489 patients with cancer and discovered that the s-p53-Abs were a marker for patients with neoplasia (p< 10-4) [69]. There was a significant correlation between s-p53-Abs and p53 mutations and various types of cancer. Interestingly, cancers that did not have p53-mut, specifically testicular carcinoma [83][84], hepatoma [85] and melanoma [86][87] were also negative for p53-Abs. On the other hand, most cancers with high rate of p53-mut have also a high frequency of s-p53-Abs, except for glioma with high p53-mut [88] and low rate of s-p53-Abs [88][89]. In a glioblastoma cohort of 60 patients, 24 of them had p53-mut, but none of them had s-p53-Abs. This could be due to the lack of the p53 immune response in the brain (an immunoprivileged organ), preventing the production of s-p53-Abs.

Roughly, about 20-40% of p53-mut patients had the s-p53-Abs in the sera. It is worthy to mention that despite similar tumors, p53-mut and its accumulation, it is not a rule that all these patients are positive for s-p53-Abs [90][91][92][93]. There must be other factors that come into play in the production of s-p53-Abs that future research could unravel.

6. Prognostic Value of p53-Abs in Cancer Patients

Many studies have been conducted to evaluate the clinical utility of s-p53-Abs. In Breast Cancer (BC), there are several studies showing that s-p53-Abs correlated with high grades of the tumor and in hormone negative steroid hormones they were not expressed [66][71][94][95][64]. Lenner et al showed in 353 BC patients that the presence of a high concentration of s-p53-Abs correlated significantly with worse survival (p=0.003) [96]. Likewise Peyrat et al showed in 165 BC patients that overall survival was worse in patients with s-p53-Abs (p<0.0005) [95].

Of note, Willsher et al in 82 BC patients did not find any correlation[97]. Porzsolt et al in 50 BC patients showed that p53-Abs were present in BC patients with a good prognosis [98]. On the contrary, Generali et al showed the association with the absence of ER expression and p53 expression, supporting its negative predictive role. Moreover, hypoxia inducible factor-1α (HIF-1α) is directly linked to the p53-mut in BC (noteworthy, the routine immunohistochemical procedures usually detect the mutated form); it leads to the inhibition of tumor apoptosis with a negative impact on treatment response in BC [99]. In colorectal cancer (CRC), few initial studies demonstrated that s-p53-Abs correlated with worse survival [80][81][100]. In fact Kressner et al showed in 184 CRC patients that s-p53-Abs correlated with shorter survival. However, the latter data did not reach the same statistical significance when Duke’s stage was taken into consideration in the analysis model [100]. Houbiers et al conducted a post-operative study in 255 CRC patients using ELISA. The group showed that 25.5% of the patients were s-p53-Abs positive. The presence of such antibodies significantly correlated with prognostic factors, like tumor shape, histological grade, angiogenesis and Quetelet Index (p= 0.02, p=0.04, p=0.02 and p=0.01, respectively). Moreover, in 64 of the CRC patients, who were at stage A or B1, the positivity to s-p53-Abs significantly correlated with decreased overall survival and disease-free survival (p=0.04 for both) [81]. On the contrary more recently, Kunizaki et al in 170 CRC observed that serum s-p53-Abs did not correlate with overall survival [101]. Angelopoulou et al study made of 229 CRC patients that 53 (23%) of the patients were s-p53-Abs positive and that the concentration of s-p53-Abs changed during disease progression or regression reflecting the disease stage. Although their data failed to reach statistical significance, they postulated an interesting hypothesis that s-p53Abs could be used to monitor CRC disease progression [80]. However, Tokunaga et al with 244 CRC patients more recently observed that serum s-p53-Abs were not able to predict patients prognosis (p=0.788) [102].

Also in lung cancer, there are controversies regarding the clinical utility of s-p53-Abs. In fact while in Non-Small Cell Lung Carcinoma (NSCLC) the antibodies associated with worse survival [103][104][105], in Small Cell Lung Carcinoma (SCLC) Zalcman et al observed in 97 SCLC patients that patients with s-p53-Abs had a worse survival compared to patients without the s-p53-Abs (p=0.014) [106]. Other groups corroborated such findings. On the contrary, Murray et al showed in 231 SCLC that in those patients having elevated s-p53-abs levels had a better survival compared to patients with lower levels of the antibody. In fact, by setting through ELISA a strong level of p53 positivity to a score up to 5, the authors observed that p53-Abs positive patients had a median survival of 11 months vs. 8 months of the patients that did not have the antibody. p53Abs appeared to be an independent prognostic factor in this study (p=0.02) [57]. Moreover, Mack et al detected in 180 lung cancer patients that there was a significant correlation between p53-Abs positivity and a shorter survival of NSCLC patients (p=0.01) [107]. More recently, Mattioni et al conducted a study made of 201 lung cancer patients corroborating what is the knowledge about NSCLC. In fact the authors demonstrated that in NSCLC patients with lower levels of s-p53-Abs survived significantly longer than patients with higher levels of s-p53-Abs (p=0.049). On the same line, the same publication additionally showed that patients with squamous cell carcinoma (excluding adenocaricinoma) with lower levels of s-p53-Abs survived significantly longer compared to patients with higher levels of s-p53Abs (p=0.044) [79].

Another series of surprising data come from oral cancer. There were two initial studies proving that s-p53-Abs expression correlated with worse survival of patients [80][81]. Bourhis et al in 80 of oral cancer patients who were s-p53-Abs positive evinced that the s-p53-Abs expression correlated with a higher risk of tumor relapse and death (p=0.003 and p=0.03, respectively) [108]. Werner et al in 149 conducted a clinical study made of head and neck cancer patients who received surgery and radiation therapy. In line with what observed by the former group, the latter group detected in the 17 seropositive for s-p53-Abs patients (44.7%) that they failed to respond to the therapy; whereas only 8 of the seronegative patients for the s-p53-Abs failed to respond to therapy (21.1%) [109]. Later on, on the same line as the previous two groups, Gottschlich et al with 109 head and neck cancer patients observed that s-p53-abs correlated with worse outcomes, although the authors did not show any statistical significance in their data [110]. Successively, Shimada et al detected in 258 oesophageal cancer patients that s-p53-Abs (p < 0.001; HR: 10.6 2; 95%CI:.76-40.00) and S-CRP were independent prognostic factors [111]. To corroborate these findings, later on Sainger et al observed that the s-p53-Abs positivity correlated with lymph node metastasis, advanced disease and well-differentiated tumors [112]. Most recently, Kunizaki et al attested in 133 patients with esophageal squamous cell carcinoma the high levels of both S-p53Ab and SCC-Ag in patients correlated with significantly lower survival compared to patients with elevated and patients with elevated levels of only one or neither of these factors (p=0.009) [113]. Furthermore, s-p53-Abs positivity strongly correlated with poor outcome from treatment in in the 60 oral precancerous treated patients.

The updated list of all the clinical studies evincing the prognostic value of s-p53-Abs in all the cancer types is summarized in Table 1.    

Table 1. Clinical studies investigating the prognostic value of s-p53-Abs in cancer.

Study

Methods and patients

Prognostic or Predictive Outcomes

Reference

Kunizaki et al 2018

S-p53Ab, SCC-Ag, CEA

 

Antibody for p53-wt

 

133 esophageal squamous cell carcinoma patients

The presence of both S-p53Ab and SCC-Ag in patients correlated with significantly lower survival compared to patients with elevated and patients with elevated levels of only one or neither of these factors (p=0.009).

[113]

Kunizaki et al 2017

S-p53Ab 

 

Detected with anti-p53 detection kit MESACUP anti-p53 Test

 

Antibody for p53-wt

 

208 GC patients

 

Did not observe any significant correlation between S-p53Ab in GC and overall survival (hazard ratio(HR)=2.052; 95% confidence interval(CI)= 0.891-4.726; p=0.091).

 

Conversely, Cox regression analysis revealed that a high level of CA19-9 was an independent prognostic factor for GC (hazard ratio(HR)=3.864; 95% confidence interval(CI)= 1.248-11.959; p=0.019).

[114]

Tokunaga et al 2017

CEA, CA19-9, S-P53Ab

 

Antibody for p53-wt

 

 

244 CRC patients

S-P53Ab had no power to predict the prognosis (P = 0.786).

 

Combined CEA and CA19-9 positivity was an exclusive independent prognostic factor (P = 0.034).

[102]

Kunizaki et al 2016

S-p53Ab, CEA 

 

ELISA. Antibody for p53-wt

 

170 CRC patients

Positivity for s-p53Ab in CRC did not correlate with overall survival.

 

Kaplan-Meier analysis revealed significant differences between patients with elevated s-p53Ab and CEA and those with elevated levels of either one or neither of these factors (p<0.001).

[101]

Mattioni et al 2015

s-p53-Abs 

 

ELISA. Antibodies for p53-wt Direct Sequencing was used to detect mutations: Mutant and Wild type antibodies: 9 patients with p53-wt

and 3 patients with p53 deletions

 

201 NSCLC patients

Patients with lower levels of p53Abs survived significantly longer than patients with higher levels of p53Abs (p=0.049)

[79]

Anderson et al 2010

s-p53Ab

 

ELISA. Antibodies for p53-wt

 

Invasive serous OC (n = 60), nonserous ovarian cancers (n = 30), and women with benign disease (n = 30).

 

p53-Ab did not significantly improve the detection of cases [area under the curve (AUC), 0.69] or the discrimination of benign versus malignant disease (AUC, 0.64) compared with CA 125 (AUC, 0.99) or HE4 (AUC, 0.98). In multivariate analysis among cases, p53-AAb correlated only with a family history of breast cancer (P = 0.01).

[115]

Atta et al 2008

s-p53Ab

 

ELISA. Antibodies for p53-wt.

 

41 HCC, 26 Liver cirrhosis, 29 healthy controls

 

Our results revealed that anti-p53 has a positive significant correlation with AFP (p=0.002), severity of liver disease [Child Pugh score (p=0.02) and MELD score (p=0.0003)], tumor size (p<0.0001), tumor number (p=0.003) and tumor staging systems [Okuda (p=0.04), CLIP (p=0.006) and Tokyo (p<0.0001)]. Also, our results revealed that s-p53-Abs had a significant association with overall survival of patients with HCC (p=0.019) with a shorter survival time in anti-p53 positive status patients and with higher s-p53-Abs levels within 19 months follow up

[116]

Mattioni et al 2007

S-p53-Abs

 

Levels of

p53-mut were determined with a selective, quantitative

ELISA kit (Cambridge, Oncogene, USA)

 

 

111 GC patients

64 healthy donors

 

 

 

 

The survival time of serum-positive patients was significantly longer than that of patients with low/negative serum levels, with a survival rate of 41.2% and 14.9%, respectively, over 48 months (p<0.05).

[117]

Lawniczak et al 2007

S-p53-Abs 

 

ELISA

 

71 GC patients

 

The presence of p53-Abs  was connected with intestinal tumor type (p < 0.05) and older age (p = 0.0035).

 

[118]

Akere et al 2007

S-p53-Abs 

ELISA. Antibodies for p53-wt

 

41 HCC patients

45 controls 

 

There is a low prevalence of serum anti-p53 in our study population, and this is commoner in men. It is also present in the control group and therefore may not be useful as a diagnostic tool in this study population.

 

[119]

Sainger et al 2006

S-p53-Abs 

ELISA. Antibodies for p53-wt

 

60 oral precancerous patients,

75 untreated oral cancer patients, and 86 follow-up blood samples of the oral cancer patients.

55 healthy controls,

 

The s-p53-Abs positivity correlated with

lymph node metastasis, advanced disease and well-differentiated tumors.

 

Furthermore, p53-Abs  positivity strongly correlated with poor outcome from treatment in in the 60 oral precanecours treated patients.

 

[112]

Goodell et al 2006

S-p53-Abs 

 

ELISA. Antibodies against p53K132Q (c.394A>C).

 

104 ovarian cancer patients

 

Patients with s-p53Abs recognizing the mutated protein showed a significantly higher survival compared to patients without antibody (p=0.01)

[120]

Gumus et al 2004

S-p53-Abs 

 

ELISA. Antibodies for p53-wt

 

76 urinary bladder cancer patients

There was an association between the presence of s-p53-Abs and tumor p53 gene overexpression (P = 0.001)

 

[121]

Shimada H et al 2003

S-p53-Abs,

C-reactive

 

ELISA Antibodies for p53-wt

 

258 oesophageal cancer patients

s-p53-Abs (p < 0.001; HR: 10.6 2; 95%CI:.76-40.00) and S-CRP were independent prognostic factors.

[111]

Hødgall et al 2002

S-p53-Abs

ELISA Antibodies for p53-wt

 

193 OC patients

34 borderline OC

86 healthy controls

 

No significant associations were found between p53 AAb and clinical stage, age, histological subtype and radicality after primary surgery.

[122]

Parasole et al 2001

S-p53-Abs

ELISA. Antibodies for p53-wt

 

80 HCC patients

 

anti-p53 was not useful as prognostic factors 

 

[123]

Tangkijvanich et al 2000

S-p53-Abs

ELISA. Antibodies for p53-wt

 

121 HCC patients

There were no differences between groups with regard to age, sex, viral markers (HBsAg or anti-HCV), severity of liver disease and tumor advancement. The median survival rates for patients positive and negative for s-p53-Abs were 4.0 and 3.0 months, respectively (p = 0.443, by log-rank test). 

[124]

Sitruk et al 2000

S-p53-Abs

ELISA

 

159 HCC patients

Detection of s-p53-Abs was significantly correlated with the presence of a multinodular or infiltrative tumor (P<0.03)

 

[125]

Zalcman et al 2000

S-p53-Abs

ELISA. Antibodies for p53-wt

 

97 SCLC patients

Patients with limited-stage SCLC and p53-Ab had a median survival time of 10 months, whereas limited-stage SCLC patients without p53-Ab had a 17-month median survival time (p = 0.014).

[106]

 

Murray et al 2000

S-p53-Abs

ELISA. Antibodies for p53-wt

 

231 SCLC patients

High levels of p53-Abs correlated with worse survival compared to patients with lower levels of the antibodies (p = 0.02).

[57]

 

 

Gottschlich et al 2000

S-p53-Abs

ELISA. Antibodies for p53-wt

 

109 head and neck cancer patients

p53-seropositive for the p53-Abs patients showed a correlation with clinical outcome.

 

[110]

Mack et al 2000

S-p53-Abs

Immunofluorescence. Antibodies against p53 R273H (c.818G>A).

 

 

35 SCLC patients

99 NSCLC patients

 

There was no correlation between p53-Abs  status in SCLC, but the presence of these antibodies and a significant correlation with shorter survival in NSCLC (p=0.01).

 

[107]

Lenner et al 1999

S-p53-Abs

ELISA. Antibodies for p53-wt

 

353 BC patients

There was a significant negative correlation between presence of s-p53-Abs and survival (P= 0.003)

 

[96]

 

Kressner et al 1998

S-p53-Abs

ELISA. Antibodies for p53-wt

 

184 CRC patients

p53-Abs correlated with shorter survival (p=0.02)

[100]

Werner et al 1997

S-p53-Abs

ELISA. Antibodies for p53-wt

 

143 oral cancer patients

the presence of the p53-Ab significantly correlated with more local tumor recurrences and deaths tumor compared to the other group of p53-Ab negative patients (p<0.05)

 

[109]

 

 

 

Angelopoulou et al 1997

anti-p53 antibodies

 

ELISA. c.742C>T p.R248W

 

229 CRC patients

p53Abs did not significantly correlate with survival

[80]

Bourhis et al 1996

S-p53-Abs

ELISA. Antibodies for p53-wt. They previously showed a correlation between their ELISA p53-wt antibodies with the presence of p53-mut gene[105].

 

90 oral cancer patients

p53-Abs expression correlated with a higher risk of tumor relapse and death (p=0.003 and p=0.03, respectively)

[108]

 

Willsher et al 1996

S-p53-Abs

ELISA Antibodies for soluble p53 with 132 amino acids deletions from N-terminus.

 

82 BC patients

Did not find any correlation

[97]

Peyrat et al 1995

S-p53-Abs

ELISA. Antibodies for p53-wt.

 

165 BC patients

Overall survival was significantly worse in patients with s-p53-Abs compared to patients without the s-p53-Abs (p<0.0005).

 

[95]

 

Houbiers et al 1995

S-p53-Abs

ELISA. Antibodies for p53-wt

 

255 CRC patients

Overall survival and Disease Free Survival were significantly worse in patients with s-p53-Abs compared to patients without the s-p53-Abs (p=0.04 for both).

[81]

Porzsolt et al 1994

S-p53-Abs

ELISA. Antibodies against p53R273H (c.818G>A).

 

50 BC patients

s-p53-Abs were higher in BC patients with high risk vs patients with low risk. The difference was not statistically significant (p=0.15)

[98]

Volkmann et al 1993

S-p53-Abs

ELISA. Antibody PAb 1801 against p53-wt and p53-mut. Epitope amino acids 32-79

 

80 BC patients

s-p53-Abs correlated with better prognosis compared to patients without the antibodies (p<0.00003

)

[126]
             

Abbreviations: breast cancer, BC; hepatocellular carcinoma, HCC; gastric cancer, GC; serum p53 antibodies, s-p53-Abs; small cell lung carcinoma, SCLC; p53 wild-type, p53-wt; p53 mutant, p53-mut; Non-small cell lung carcinoma (NSCLC).

7. Discussions and Future Directions

The role of p53-Abs is becoming increasingly important in an era where immune-oncology is advancing at a great speed. Firstly, it is known that infection by SV40 and any other virus stresses the cell and that the infecting viruses avoid cell death by elaborating the following mechanisms: they inhibit p53-wt protein and they inhibit the Rb protein, which is needed to block apopotosis and cell cycle arrest. Secondly, in many cancer cells, from viral and no-viral origin, p53-mut is expressed at very high levels. The p53-mut is unable to bind to DNA to promote the transcription of MDM2 and other p53 transactivational targets and it is therefore not regulated by the same autoregulatory loop of p53-wt. As a direct consequence this leads to its expressed at very high levels in cancer cells, where they work as dominant negative proteins to p53-wt. As an indirect consequence, the accumulated p53-mut serves as an antigen. Finally these p53-mut antigens drive the adaptive immune system to recognize such antigens and produce antibodies that may kill the cancer cells with p53-mut or normal cells with p53-wt. Worth to say that the studies investigating the prognostic role of p53-Abs still remain controversial; and it appears to be tissue-specific. Most interestingly, we have reported here a full updated list of studies on the prognostic value of s-p53-Abs in cancer from published literature (Table 1). Except in a few cases, the vast majority of these studies use p53-wt as the antigen to detect s-p53-Abs in cancer patients and it is unclear that these s-p53-Abs can recognize p53-mut at all. In an historic epoch that has been contemplating the advancement of targeted therapies to meet specific therapeutic needs of cancer patients, it would be of paramount importance to know whether the ELISA assays, designed for recognition of s-p53-Abs, can recognize p53-mut. This review tries to summarize to the best of our knowledge such notion in Table 1. Having methods to detect specific p53-Abs recognizing specific p53-mut could become pivotal in future studies trying to better understand their prognostic value. Moreover, antibodies against specific p53-mut could be directly used for future therapies, which is something p53 biologists would like to further investigate. Sabapathy and colleagues have put this idea into practice by developing mouse monoclonal antibodies against p53 hotspot mutants, R175H, R248Q, and R273H[154], yet the therapeutic effacicy has not been reported.

Of note, expressions of PD-L1 and p53 correlated in various types of cancers[155–159]. Additionally p53-mut downmodulates the expression of PD-L1 through microRNA-34[155]. For such reasons, it would be also interesting in future experiments to investigate the efficacy of p53-Abs recognizing p53-mut in combination with checkpoint inhibitors against PD-L1.

In conclusion, there are s-p53-Abs in a significant portion of cancer patients (mostly observed by ELISA) and only in a small fraction of these studies, the presence of s-p53-Abs predicts better survival. Virtually all s-p53-Abs are detected using p53-wt as an antigen. One thing we do not currently know, but hope that an antibody targeting a specific p53-mut will be effective in therapeutics against the cancer carrying the exact p53-mut. In fact, s-p53-Abs from cancer patients may target both p53-wt and p53-mut. Novel antibodies targeting p53-mut, but not p53-wt, should be pursued in pre- and clinical trials.

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Subjects: Immunology
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Navid Sobhani
,
Alberto D’Angelo
,
Xu Wang
,
Ken H. Young
,
Daniele Generali
,
Yong Li
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Update Date: 27 Oct 2020
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