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Nada, H. Key Heterocyclic Anti-Angiogenic Leads. Encyclopedia. Available online: https://encyclopedia.pub/entry/7223 (accessed on 20 April 2024).
Nada H. Key Heterocyclic Anti-Angiogenic Leads. Encyclopedia. Available at: https://encyclopedia.pub/entry/7223. Accessed April 20, 2024.
Nada, Hossam. "Key Heterocyclic Anti-Angiogenic Leads" Encyclopedia, https://encyclopedia.pub/entry/7223 (accessed April 20, 2024).
Nada, H. (2021, February 13). Key Heterocyclic Anti-Angiogenic Leads. In Encyclopedia. https://encyclopedia.pub/entry/7223
Nada, Hossam. "Key Heterocyclic Anti-Angiogenic Leads." Encyclopedia. Web. 13 February, 2021.
Key Heterocyclic Anti-Angiogenic Leads
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This entry is adapted from the peer-reviewed paper 10.3390/molecules26030553

Pathological angiogenesis is a hallmark of cancer; accordingly, a number of anticancer FDA-approved drugs act by inhibiting angiogenesis via different mechanisms. However, the development process of the most potent anti-angiogenics has met various hurdles including redundancy, multiplicity, and development of compensatory mechanisms by which blood vessels are remodeled. Moreover, identification of broad-spectrum anti-angiogenesis targets is proved to be required to enhance the efficacy of the anti-angiogenesis drugs. In this perspective, a proper understanding of the structure activity relationship (SAR) of the recent anti-angiogenics is required. Various anti-angiogenic classes have been developed over the years; among them, the heterocyclic organic compounds come to the fore as the most promising, with several drugs approved by the FDA.

anticancer heterocyclic

1. Introduction

As the second leading cause of mortality globally, cancer has become the focus for extensive research [1][2]. Although cancer progression and metastasis consist of multiple, complex, interacting, and interdependent steps [3], angiogenesis plays an essential part of the tumor’s growth and metastasis [4], owing to the fact that growth beyond the size of l–2 mm3 requires tumors to develop an adequate blood supply [5][6]. Angiogenesis is the processes whereby new blood and lymphatic vessels form[7]. Angiogenesis and its induction remain a major hallmark of cancer as it flourishes nutrient-deprived tumors with oxygen and nutrients, thus routing tumor metastasis[8][9]. 

Under normal conditions, angiogenesis is essential for formation of a new vascular network to supply nutrients, oxygen, and immune cells, as well as to remove waste products [10]. This process is regulated by a balance between pro- and anti-angiogenic molecules, and once that delicate balance is disturbed[11], it could lead to various diseases, especially cancer [12]. Angiogenesis is a vital mediator of tumor development[13]. As tumors enlarge, diffusion distances from the current vascular supply rise, leading to hypoxia [14]. Continued expansion of a tumor mass needs new blood vessel formation to offer rapidly proliferating tumor cells with a suitable supply of oxygen and metabolites[15]. Without the proper blood supply, tumors cannot grow beyond a critical size or metastasize to another organ[16]. Therefore, targeting angiogenesis is one of the most effective ways to stop a tumor progression [17].

Most of the drugs that have been developed to combat angiogenesis have heterocyclics in their backbone as a common feature. This is demonstrated by heterocyclics occupying the major part of the number of FDA-approved anti-angiogenic drugs, as demonstrated in Figure 1. This domination of FDA-approved drugs is likely due to the wide availability of various heterocyclic fragments that have different potency, physicochemical properties, and lipophilicity. This versatility makes heterocyclic fragments a sound rational choice when developing new drugs or altering an existing one.

Molecules 26 00553 g001 550

Figure 1. FDA-approved angiogenesis inhibitors for treatment of cancer[18][19]. VEGFR, vascular endothelial growth factor receptor.

2. Nitrogen-Based Heterocycles

The number of anti-cancer candidates possessing a nitrogen heterocycle is an indicator of the structural significance of nitrogen-based heterocycles in the fight against cancer [20][21][22]. More than 75% of drugs approved by the FDA and currently available in the market are nitrogen-containing heterocyclic moieties [23]. One of the most important targets in angiogenesis inhibition is vascular endothelial growth factor receptors (VEGFRs).

Vascular endothelial growth factor is an important signaling protein involved in both vasculogenesis (the formation of the circulatory system) and angiogenesis (the growth of blood vessels from pre-existing vasculature)[24][25]. As its name implies, VEGF activity is restricted mainly to cells of the vascular endothelium [26]. The expression of VEGF is potentiated in response to hypoxia, by activated oncogenes, and by a variety of cytokines [27]. VEGF induces endothelial cell proliferation, promotes cell migration, and inhibits apoptosis [28]. VEGF induces angiogenesis as well as permeabilization of blood vessels, and plays a central role in the regulation of vasculogenesis[29][30].

Deregulated VEGF expression contributes to the development of solid tumors by promoting tumor angiogenesis and to the etiology of several additional diseases characterized by abnormal angiogenesis[31]. Consequently, inhibition of VEGF signaling abrogates the development of a wide variety of tumors[32]. All members of the VEGF family stimulate cellular responses by binding to tyrosine kinase receptors (the VEGFRs) on the cell surface, causing them to dimerize and become activated through transphosphorylation[33][34].

Several nitrogen-based heterocyclic drugs have been used to inhibit VEGF, for example, agents that inhibit the VEGFR tyrosine kinase such as the pyrrolidinone-based Sunitinib were approved by the FDA for the treatment of renal cell carcinoma (RCC) and imatinib-resistant gastrointestinal stromal tumor[35][36]. Another example is the phthalazine-based vatalanib, which is under investigation for the treatment of metastatic colorectal cancer and non-small cell lung cancer (NSCLC) [37][38]. Indole ring is one of the nitrogen-based heterocyclics that have been involved in VEGF inhibition[39]. It has demonstrated the ability to inhibit the proliferation, growth, and invasion of human cancer cells. Panobinostat is an indole-based drug approved in 2015 for the treatment of multiple myeloma[40].

Renhowe et al. synthesized a series of quinolin-2-one analogues that showed promising VEGFR-2 inhibition activity (Table 1)[41]. Upon examining the series of analogues synthesized by Renhowe et al., it was found that the free NH of the hydroquinolin-2-one scaffold (Figure 2), the quinolinone carbonyl, and the benzimidazole NH formed donor–acceptor motifs that would bind to the hinge region of the VEGFR-2, which could be implicated in tumor vasculature formation and maintenance [42][43]. The importance of a hydrogen donating group was found through substituting different groups at the C4 position, observing the potency increasing with (NH2 > OH > H). The incorporation of large basic amine at the C4 position such as an amino quinuclidine resulted in much more potent activity; however, it negatively affected the pharmacokinetics. Therefore, the NH2 substitution at C4 was maintained and subsequent efforts focused on modifying the substitution on both rings A and D to attain additional enzymatic affinity and to improve physicochemical properties.

Molecules 26 00553 g002 550

Figure 2. Structure–activity relationship study of 3-benzimidazol-2- ylhydroquinolin-2-one derivatives.

Table 1. In vitro inhibition of vascular endothelial growth factor receptor 2 (VEGFR-2) by the quinolin-2-one analogues (1–10) [41].

Compound Y R1 R2 VEGFR-2 (IC50 μM) PDGFRβ (IC50 μM)
1 OH H H 0.24 0.020
2 NH2 H H 0.058 0.010
3 NHMe H H 0.22 0.030
4 Molecules 26 00553 i001 H H 0.17 0.0002
5 H Molecules 26 00553 i002 H 0.017 0.0003
6 NH2 Molecules 26 00553 i003 H 0.005 0.0001
7 NH2 H Me 0.22 0.030
8 NH2 H Molecules 26 00553 i004 0.057 0.005
9 NH2 H Molecules 26 00553 i005 0.027 0.002
10 NH2 H Molecules 26 00553 i006 0.026 0.0009

As illustrated in Figure 3, the interaction of compound 10 with VEGFR-2 receptor active site (IC50 = 0.026 μM) was subjected to docking studies using Schrodinger maestro. The modelling simulation shows a significant docking score of −9.058, along with the formation of two hydrogens bonds as well as two π–cation bonds. These interactions were found to be energetically significant as all the formed bonds among the donor and acceptor atoms are within about 3.7 Å.

Molecules 26 00553 g003 550

Figure 3. Predicted interaction of compound 10 (imidazole-scaffold) with active site residues of VEGFR-2. (a) 3D structural view of ligand inside the receptor’s active site. (b) Ligand interaction diagram; violet lines represent hydrogen bonds and red lines represent π–cation interactions.

Although VEGF is an important pathway in angiogenesis, several other targets are also involved in angiogenesis. Matrix metalloproteinases (MMPs) are one such target involved in angiogenesis[44]. MMPs are implicated in early steps of tumor evolution including stimulation of cell proliferation and modulation of angiogenesis[45]. During angiogenesis, new vessels develop from present endothelial lined vessels to encourage the degradation of the vascular basement membrane and remodel the extracellular matrix (ECM), followed by endothelial cell migration, proliferation, and formation of the new generation of matrix components[46][47].

Matrix metalloproteinases participate in the disruption, tumor neovascularization, and successive metastasis, while tissue inhibitors of metalloproteinases (TIMPs) downregulate the activity of these MMPs [48]. Therefore, MMPs, through the modulation of the balance between pro- and anti-angiogenic factors, can directly or indirectly mediate the angiogenic response [49].

The relation between MMP overexpression in tumor and cancer progression has encouraged the progress of preclinical trials with a series of inhibitors designed to block the proteolytic activity of these enzymes.

Thus far, no FDA-approved MMP inhibitors for the treatment of cancer have emerged. However, several leads have been developed; for example, Becker et al. reported new piperidine α-sulfone hydroxamates with potent matrix metalloproteinase inhibition activity[50]. The α- and β-sulfone derivatives showed a difference in the inhibitory activity toward the metalloproteinases. The β-sulfone hydroxamate showed potency for the targeted MMPs and selectivity for MMP-1, but generally exhibited poor oral bioavailability. In addition, some β-sulfones with α-hydrogens can undergo β-elimination. On the other hand, the α-sulfones possess both potency and selectivity and provide an improvement in oral exposure demonstrated by a higher Cmax value and bioavailability relative to the β-sulfones.

On further investigation, they concluded that α-sulfone derivatives are two to four times more potent and bioavailable than the β-sulfones. The higher bioavailability and Cmax may be due to greater steric bulk around the hydroxamate, protecting it from the usual modes of hydroxamate metabolism including N-O bond cleavage, hydrolysis, and glucuronidation. The findings of Becker et al. can be explained through the comparison of the different activities of α- and β-sulfone derivatives, as demonstrated in Table 2.

Table 2. Comparing α- and β-sulfone derivatives for their matrix metalloproteinase 1 (MMP-1) activity [50].

Table 2. Comparing α- and β-sulfone derivatives for their matrix metalloproteinase 1 (MMP-1) activity [50].
Molecules 26 00553 i007
    Ki (nM)
Compound MMP-1 MMP-2 MMP-3 MMP-9 MMP-13 Cmax
11 (β-sulfone) 800 0.4 17.5 1 0.6 1372
12 (α-sulfone) 435 ˂0.1 18.1 0.3 0.15 3119

 

Looking at the interaction of the α- and β-sulfone derivatives (Figure 4 and Figure 5) with the active site residues of MMP-2 [51], the difference in potency can be elucidated because of the fact that the α-derivative showed a docking score of −7.054, while its counterpart, the β-derivative, exhibited a docking score of −5.22. This difference in the docking scores as well as forming different interactions with the active site could explain why the α-sulfone derivative would be a more promising lead for further development.

Molecules 26 00553 g004 550

Figure 4. Predicted interaction of α-sulfone (12) derivative active site residues of matrix metalloproteinase (MMP) [51,52]. (a) 3D structural view of ligand inside the receptor’s active site. (b) Ligand interaction diagram; violet lines represent hydrogen bonds and green lines and grey line represent metal interactions.

Molecules 26 00553 g005 550

Figure 5. Predicted interaction of β-sulfone (11) derivative active site residues of MMP. (a) 3D structural view of ligand inside the receptor’s active site. (b) Ligand interaction diagram; violet lines represent hydrogen bonds, green lines represent π–π interactions, and grey line represent metal interactions.

3. Heterocyclic Sulfonamides

Sulfonamides significance stems from the fact that they constitute a significant class of drugs with various types of pharmacological effects including antitumor, anti-carbonic anhydrase, and diuretic activity[53][55][56][54]. There are many reports of a multitude of structurally novel heterocyclic sulfonamide derivatives that have been stated to display significant antitumor activity[57][58]. Although the mechanism by which they combat cancer may vary, the majority of anti-cancer sulfonamides act on angiogenesis through several pathways.

As of today, there are no FDA-approved heterocyclic sulfonamide anti-angiogenics in the market, but there are several promising leads being developed. One of such leads is E7820, which is now in phase II clinical trial for colorectal cancer treatment through the inhibition of integrin α2 [59]. Integrins are transmembrane receptors that are central to the biology of many human pathologies, where they act through the mediation of the cell-extracellular matrix and cell–cell interaction [60]. This mediative action is carried out through the transduction of information from the extracellular environment to modulate cell responses, together with adhesion, spreading, migration, growth signaling, survival signaling, secretion of proteases, and invasion[3][61][62]. Numerous studies report that the increased levels of integrin α2 facilitate the spread of cancer [63][64][65][66]. Thus, inhibitors of integrin α2, such as that shown in Figure 6, will slow the spread of cancer and its metastasis.

Molecules 26 00553 g006 550

Figure 6. Chemical structure of the heterocyclic sulfonamide anti-angiogenic E7820.

Hypoxia inducible factors (HIFs) are another promising anti-angiogenic inhibitor[67]. This is because of the requirement of an adequate oxygen supply for the macroscopic tumor to grow [68]. This need is fulfilled through tumor angiogenesis, which results from an increased synthesis of angiogenic factors and a decreased synthesis of anti-angiogenic factors[49][69].

The shift of the balance between pro- and anti-apoptotic factors due to the metabolic adaptation of tumor cells to decrease the oxygen availability by increasing glucose transport and glycolysis to promote survival is prominent in hypoxia[69][70]. In this regard, HIF-1, which is induced by many factors, is mainly implicated in tumor angiogenesis.

A class of heterocyclics based on the lead sulfonamide hits identified by Gerguson et al. showed potent activity against hypoxia (Table 3) [71][72]. It was found that the oxygen atom in ring A was essential for the activity, while the double bond in the same ring resulted in increased hepatotoxicity, leading to the conclusion that the double bond should be removed. Furthermore, the sulfonamide moiety as well as the hydrophobic substitutions in ring B increased the activity significantly. In ring C, the methoxy substituent at para position is essential for activity, while meta methoxy is not. Additionally, upon replacing the para methoxy with electron withdrawing groups, the activity was lost, demonstrating that only electron donating groups should occupy this position. This SAR is summarized in Figure 7.

Molecules 26 00553 g007 550

Figure 7. Structure–activity relationship study of the benzenesulfonamide hits and its analogues [71][72].

Table 3. In vitro inhibition of hypoxia inducible factor 1 (HIF-1) transcriptional activity in cell-based HRE reporter assay by the benzenesulfonamide analogues (13–18) [72].

Molecules 26 00553 i008
Compound R1 R2 LN229-HRE-Lux (IC50 μM)
13 Molecules 26 00553 i009 Molecules 26 00553 i010 0.6 μM
14 Molecules 26 00553 i011 Molecules 26 00553 i012 0.6 μM
15 Molecules 26 00553 i013 Molecules 26 00553 i014 1.3 μM
16 Molecules 26 00553 i015 Molecules 26 00553 i016 3.3 μM
17 Molecules 26 00553 i017 Molecules 26 00553 i018 >25 μM
18 Molecules 26 00553 i019 Molecules 26 00553 i020 0.5 μM

The interaction of compound 13, possessing IC50 of 0.6 μM, with HIF-1 active site residue, is demonstrated in Figure 8. It showed better binding energy and inhibition constant as compared with N-((2,2-dimethylchroman-6-yl) methyl) sulfonic amide, with docking scores of −6.85 and −5.4, respectively. This could be owing to the ability of the sulfonamide derivative (13) to form a hydrogen bond and metal interaction with the active site residue.

Molecules 26 00553 g008 550

Figure 8. Predicted interaction of compound 13 with hypoxia-inducible factor active site residue. (a) 3D structural view of the sulfonamide ligand inside the receptor’s active site. (b) Ligand interaction diagram; violet lines represent hydrogen bonds and grey lines represent metal interaction.

4. Conclusions

Throughout this review, several leads were investigated for SAR, molecular interaction, and in silico pharmacokinetics study. The following outlines were concluded, aiming to develop more active analogues of the discussed leads. Compound 10 and its derivatives would benefit from both a modification to prevent its efflux by the PGP as well as modifications to increase its interaction with the VEGFR-2 active site. Both compounds 12 and 13 and their derivatives show good drug-likeness properties, but would benefit from further isosteric changes to their structures to increase their interactions with their respective active site. Paclitaxel and its derivatives have shown the highest binding potential to MTA active site residue, with docking scores around −9.5. However, they all violated Lipinski’s rule of five, leading to poor bioavailability. Therefore, further modification to their chemical structure is highly needed.

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Subjects: Oncology; Chemistry, Medicinal
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Hossam Nada
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