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Ismail, N.H.;  Mussa, A.;  Zakaria, N.A.;  Al-Khreisat, M.J.;  Zahidin, M.A.;  Ramli, N.N.;  Mohammad, S.N.N.A.;  Hassan, R.;  Noor, N.H.M.;  Iberahim, S.; et al. Targeting Epigenetic Mechanisms in Multiple Myeloma. Encyclopedia. Available online: https://encyclopedia.pub/entry/35310 (accessed on 13 June 2024).
Ismail NH,  Mussa A,  Zakaria NA,  Al-Khreisat MJ,  Zahidin MA,  Ramli NN, et al. Targeting Epigenetic Mechanisms in Multiple Myeloma. Encyclopedia. Available at: https://encyclopedia.pub/entry/35310. Accessed June 13, 2024.
Ismail, Nor Hayati, Ali Mussa, Nur Atikah Zakaria, Mutaz Jamal Al-Khreisat, Muhamad Aidil Zahidin, Noor Nabila Ramli, Siti Nur Nabeela A’ifah Mohammad, Rosline Hassan, Noor Haslina Mohd Noor, Salfarina Iberahim, et al. "Targeting Epigenetic Mechanisms in Multiple Myeloma" Encyclopedia, https://encyclopedia.pub/entry/35310 (accessed June 13, 2024).
Ismail, N.H.,  Mussa, A.,  Zakaria, N.A.,  Al-Khreisat, M.J.,  Zahidin, M.A.,  Ramli, N.N.,  Mohammad, S.N.N.A.,  Hassan, R.,  Noor, N.H.M.,  Iberahim, S.,  Zulkafli, Z.,  Yusoff, S.M.,  Husin, A., & Johan, M.F. (2022, November 18). Targeting Epigenetic Mechanisms in Multiple Myeloma. In Encyclopedia. https://encyclopedia.pub/entry/35310
Ismail, Nor Hayati, et al. "Targeting Epigenetic Mechanisms in Multiple Myeloma." Encyclopedia. Web. 18 November, 2022.
Targeting Epigenetic Mechanisms in Multiple Myeloma
Edit

Multiple myeloma (MM) is an exceptionally complicated and heterogeneous disease that is caused by the abnormal proliferation of malignant monoclonal plasma cells initiated in the bone marrow. In disease progression, a multistep process including differentiation, proliferation, and invasion is involved.

multiple myeloma DNA methylation histone modification

1. Targeting DNA Methylation

Between the years 2004 and 2015, the United States Food and Drug Administration (FDA) granted authorisation for the use of six different epigenetic agents in clinical trials. These epigenetic agents include azacytidine, 5-aza-2′-deoxycytidine, suberoylanilide hydroxamic acid (SAHA), romidepsin, belinostat, panobinostat and chidamide [1]. In addition, the FDA has granted approval for the therapeutic use of 5-aza-2′deoxycytidine (5-aza-AZA; decitabine) and 5-aza-acytidine (5-aza-AZA) for the treatment of patients who suffer from MDS and chronic myelomonocytic leukaemia. These two epigenetic drugs did not have a clinical license to treat myelodysplastic syndromes [2], but they did display anti-myeloma efficacy in vitro and in vivo [3][4]. AZA [5] and DAC [6] accelerate clonal cell cycle arrest by boosting the activation of negative cell cycle regulators, which ultimately leads to apoptosis and senescence pathways (p16 and p15). G0/G1 and G2/M cell cycle arrests involving p21 and p38 were detected following DAC therapy [6]. Curiously, AZA in combination with doxorubicin and bortezomib had synergistic anti-MM efficacy [7] and restored sensitivity to dexamethasone [8]. Both AZA and 5-aza-2′-deoxycytidine (DAC) are capable of exerting detrimental effects by integrating into DNA and blocking covalently bound DNMT enzymes, which in turn causes DNMT damage and passive DNA demethylation [9]. In a model of murine myeloma, treatment with CM-272, an inhibitor combination that blocks both DNMTs and the histone methyltransferase G9a, decreases bone loss associated with the tumour and reduces the overall volume of the tumour. Utilising inhibitors allows for the induction of osteoblast formation in myeloma MSCs and the restoration of the expression of hypermethylated osteogenic regulators [10].

2. Targeting Histone Acetylation

HDACi displays anti-MM activity in cells by activating the apoptotic pathway, inhibiting the proteasome, and decreasing tumorigenesis and treatment resistance [11][12]. WT161, an HDAC6 inhibitor, induces cell death by boosting tubulin acetylation and inhibiting aggresome-dependent protein degradation in MM cells both in vitro and in vivo [13]. Panobinostat (LBH589) is a pan-HDACi that interacts with bortezomib and has been licensed for patients with relapsed or refractory MM [14] due to its ability to inhibit class I, II, and IV HDACs at a low nanomolar concentration [15][16]. This agent inhibits aggresome and proteasome networks and enhances the acetylation of proteins implicated in many carcinogenic pathways in MM cells [17]. Thus, progression-free survival (PFS) and complete and near-complete responses were significantly enhanced. Nevertheless, some individuals had adverse symptoms, including thrombocytopenia, diarrhoea, asthenia, and weariness. The combined treatment of panobinostat, bortezomib, and dexamethasone is predicted to benefit patients with MM cancer who developed bortezomib resistance [18]. Additionally, the first oral selective HDAC6 inhibitor, Ricolinostat (ACY-1215), showed reduced class I HDAC activity when coupled with carfilzomib [19], lenalidomide, and dexamethasone [20], showing anti-MM effects following therapy. HDACi concentrates on bromodomain and the extra-terminal domain (BET) because the BET proteins physically link the enhancer and promoter regions to stimulate the initiation and extension of gene transcription. By blocking the MYC oncogene and its gene expression network, BET inhibitors have shown an anti-MM effect in vitro and/or in vivo, either alone or in combination, highlighting that BET inhibitors might be considered a feasible therapeutic intervention in MM [21].

3. Targeting Histone Methylation

Inhibitors of histone methyltransferase for enhancer of zeste homolog 2 (EZH2) are emerging as an epigenetic therapy strategy for MM disease whether used alone or in combination with other targeted drugs. EZH2, which contains the enzyme component of the polycomb repressive complex 2 (PRC2), is essential for both normal cell development and the progression of disease (PRC2). PRC2 in EZH2 catalyses the methylation of histone H3 lysine tail residue 27 (H3K27me3), which induces the reprogramming of cells associated with stem cell self-renewal, cell cycle, cell differentiation, and cellular transformation. Thus, the discovery of highly selective inhibitors of EZH2’s histone methyltransferase activity has shed light on the function of EZH2 and PRC2 in carcinogenesis and their potential as cancer therapy targets [22].
Since both target combinations allow for the control of gene expression, histone H3 lysine 27 (H3K27) methyltransferase and G9, an H3K9 methyltransferase, have been identified as another promising therapeutic target in MM. To be more specific, the combination of these two inhibitors induces cell cycle arrest and triggers the pathway that leads to apoptosis, which in turn lowers the rate of MM cell growth. In addition, an examination in animals demonstrated an anticancer effect, as shown by a decrease in the formation of MM cell xenografts. There is also a correlation between greater levels of EZH2 and EHMT2 expression (both of which encode G9a) and worse outcomes for patients with MM. In contrast, the inhibition of EZH2/G9a resulted in an increase in the expression of genes that are activated by IFN and a reduction in the expression of genes that are involved in the IRF4-MYC axis in MM cells. This is supported by the observation that the degree of ERV gene expression in MM cells has dramatically risen and that the H3K27/H3K9 methylation levels have decreased, both of which are indicators of an IFN response [23].
The methylation process in histone H3 lysine-4 (H3K4), -36 (H3K36), and -79 (H3K79) caused transcriptional pathway upregulation in MM cells. Gene silencing events, on the other hand, were shown by methylation involving histone H4 lysine 20 (H4K20) [24]. For instance, GSK126, the EZH2 inhibitor, has been administrated to patients with MM with relapsed or refractory phases in phase I clinical trials [25]. Furthermore, MMSET histone methyltransferase was discovered as a promising target for epigenetic treatment in MM due to the anti-tumour activity shown following the shRNA-mediated suppression of MM cells in vitro and in vivo [26]. Consequently, LEM-06 has been introduced as an MMSET inhibitor to serve as an alternative model for assessing the therapeutic potential of MMSET in MM [27].
Table 1 outlines the types of epigenetic inhibitors administered to patients with MM, along with their mode of action.
Table 1. The types of epigenetic inhibitors administered to patients with MM.

4. Targeting MicroRNAs in MM

miRNAs have been suggested as a new class of agents for MM therapeutic intervention since extensive research indicated their deregulation effect on MM cells and the possible targeting of several oncogenes or tumour suppressor genes, hence modifying MM development in vitro and in vivo [48]. Dysregulation of the tumour suppressor miRNA, miR-155, leads to the suppression of MM cell proliferation and treatment resistance. miR-155 overexpression increased drug-resistant MM cells’ sensitivity to bortezomib in a dosage and time-dependent manner. miRNA-155, on the other hand, targets TNF-mediated apoptosis by decreasing caspase-8 activity, inhibiting BID cleavage and caspase-3 activation [49][50]. Furthermore, the potentiality of this inhibitor to reduce CD47 on the cell surface activates the phagocytosis process through macrophage activity, resulting in tumour regression and enhanced bone resorption in animal models [51].
The hsa_circRNA_101237 has been investigated as a potential candidate for a circular RNA (circRNA) diagnostic biomarker for multiple myeloma (MM) malignancy. When hsa_circRNA_101237 was upregulated, it was discovered that a few signalling pathways such as PI3K-Akt signalling and chemokine signalling, that are cell cycle-related, as well as the signalling pathway of cytokines and their receptors were affected. These complex interactions are associated with significantly reduced OS and PFS rates [52]. Patients with MM who received four cycles of bortezomib-containing therapy had a differential response, with a higher M protein decrease correlating with a declined expression of hsa_circRNA_101237 [52]. This is observed in contrast to patients with MM who received treatment that did not contain bortezomib. Patients who received treatment that did not include bortezomib did not have a differential response. In addition, individuals who had a deletion of 13q14, an amplification of 1q21, a deletion of the P53 gene, and mutations in the t(4,14), t(14,16), and t(11,14) genes were observed to have overexpression, but mutations in the t(11,14) gene had the opposite effect. Overexpression has a substantial effect on the prognosis of patients with MM. In addition to this, patients who had multiple myeloma that relapsed or was resistant to treatment exhibited higher expression of the hsa_circRNA_101237 [52].
Additionally, miR145-3p inhibits the growth of MM cells by initiating the apoptotic pathway in vitro and in vivo experiments. Increased rates of the pro-apoptotic protein BCL2L11 and the inactivation of mTORC1 result in the activation of the autophagic flux, which in turn causes increased autophagy and cell death [53]. Furthermore, a significantly lower expression of circ-MYBL2 was indicated in MM bone marrow and serum [54], indicating a poor prognosis due to their advanced clinical stage and other factors. Treatment with exogenous circ-MYBL2 resulted in a robust MM cell death rate and enhanced DNA production and proliferation machinery. In a manner analogous to this, the treatment of circ-MYBL2 has been shown to inhibit the growth of subcutaneous xenograft tumours in experimental animal models [55]. Additionally, miRNA-338-3p was a substrate to circ_000784, and both miRNA-338-3p and circ_0007841 showed anti-MM effects on the development and progression of multiple myeloma. Because of the efforts made by miRNA-338-3p, the PI3K/AKT signalling pathway was made more effective by circular 0007841 [53][56]. Circ_0007841 displayed its oncogene activity through the miRNA-338-3p/BRD4 complex to increase cell proliferation and cell cycle mechanisms, eventually evading the cell apoptosis and senescence route [56][57]. The effects of ncRNAs on the expression of oncogenes and tumour suppressor genes in MM are illustrated in Figure 1.
Figure 1. The dual roles of microRNAs in MM. microRNAs have the capacity to influence both the expressions of oncogenes and tumour suppressor genes. The upregulation of miR-21, miR-221/222, and miR-17-92 causes the deactivation of the BIM, SOCS1, and IL6-JAK-STAT3 pathways, which results in the activation of the Mcl-1, Bcl-XL, and c-Myc oncogenes and the suppression of the activity of the p53 gene through the LncRNAs PTV1, MALAT1, and MEG. In other pathways, the activation of miIR145-3p led to increased rates of the pro-apoptotic protein BCL2L11, and the inactivation of mTORC1 led to activation of the autophagic flux, which in turn led to increased autophagy and cell death. Both effects were caused by an increase in the rate of autophagy. miRNA-338-3p served as a substrate for circ_000784, which in turn activated the PI3K/AKT signalling pathway, as well as chemokines and cytokines, ultimately leading to the activation of hsa_circRNA_101237. Circ_0007841 revealed its oncogene activity via the miRNA-338-3p/BRD4 complex to boost cell proliferation and the processes of the cell cycle, hence bypassing the cell apoptosis and senescence pathway. Patients with multiple myeloma had significantly decreased levels of circ-MYBL2 expression in both bone marrow and serum, which is indicative of a poor prognosis owing to the advanced clinical stage of their disease and other variables. However, treatment with exogenous circ-MYBL2 resulted in a significant increase in the rate at which MM cells succumbed, as well as improved DNA synthesis and machinery for proliferation. Overexpression of miR-155 led to a dose- and time-dependent increase in drug-resistant multiple myeloma cells’ sensitivity to the anticancer drug bortezomib. In addition, the levels of miR-125a, miR-21, miR-221/222, miR-451, and miR-155 are increased in MM cells, which boosts the cell cycle, cell proliferation, and survival rate, as well as the likelihood of developing resistance to anti-myeloma therapy. miR: microRNA, BIM: Bcl-2-like protein 11, SOCS: Suppressors of cytokine signalling, IL6: Interleukin-6, JAK: Janus kinase, STAT: Signal transducer and activator of transcription, p53: tumour protein p53, Mcl-1: Myeloid cell leukemia-1, Bcl-XL: B-cell lymphoma-extra-large, c-Myc: c-myelocytomatosis oncogene product, mTOR: mammalian target of rapamycin complex 1, LncRNAs: Long Non-coding RNA, PTV1: plasmacytoma variant translocation 1, MALAT1: metastasis-associated lung adenocarcinoma transcript 1, MEG: maternally expressed gene, BCL2L11: Bcl-2-like protein 11, PI3K/AKT: Phosphatidylinositol-3-Kinase and Protein Kinase B, and BRD4: Bromodomain Containing 4.

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