Bristol-Myers Squibb (BMS)-derived indole-glyoxamide compounds, known as HIV entry inhibitors (ENIs), have been modified through strategic conjugation to polyol scaffolds such as β-cyclodextrin and hyperbranched polyglycerol (HPG) via click chemistry. These modifications were designed to enhance the potential of these molecules as next-generation vaginal microbicides—specifically, fourth-generation candidates capable of blocking HIV-1 at the initial stage of infection. The key innovation lies in linking the BMS-like pharmacophores to the C7 position of the indole ring, a site previously identified as optimal for attachment due to its favorable interaction with the gp120 glycoprotein of HIV-1. This approach preserves antiviral activity while improving delivery properties.
The synthesis began with the preparation of indole-3-glyoxylic acid derivatives bearing aliphatic spacers ending in either azide or activated alkyne groups, enabling Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC). These functionalized BMS analogues were then reacted with propargylated β-cyclodextrin (8) and propargylated HPG (11), yielding conjugates 9 and 12, respectively. Additionally, a thiol-functionalized HPG derivative was synthesized and conjugated to an alkyne-containing BMS analogue via Michael addition under physiological conditions, producing compound 14. All resulting conjugates were characterized using MALDI-TOF/TOF mass spectrometry, confirming successful incorporation of multiple BMS units onto the polymer backbones.
Toxicity assessments were conducted using TZM.bl cells, a human cervical epithelial cell line commonly used in HIV research. None of the conjugates—9, 10, 12, or 14—showed cytotoxicity at concentrations up to 100 μM, indicating excellent biocompatibility. Notably, the unmodified β-cyclodextrin, its propargylated form, HPG, and its derivatives also exhibited no toxicity, reinforcing the safety profile of the scaffold materials.
Antiviral efficacy was evaluated against R5-tropic HIV-1NLAD8, a clinically relevant strain responsible for primary infection. At non-toxic concentrations, all conjugates demonstrated significant inhibition of viral entry, with inhibition rates comparable to those of the reference carbosilane-polysulfonate dendrimer G2-S16 (a known ENI active in the nanomolar range). Even at 1 μM, conjugates 9 and 12 retained high potency, showing only slightly reduced activity compared to the unsubstituted parent compound 3.SF3A1 Antibody medchemexpress This suggests that conjugation does not compromise the intrinsic antiviral mechanism of the BMS scaffold.CK II alpha Antibody Formula
These results highlight the feasibility of creating multifunctional, low-toxicity microbicide platforms by anchoring potent ENIs to biocompatible polymers.PMID:35046697 The ability of these constructs to maintain anti-HIV activity despite structural modification opens new avenues for developing long-acting, user-controlled prevention strategies. Future work will focus on optimizing molecular weight, increasing ligand density, and testing against diverse HIV-1 strains to advance toward clinical application. This study establishes a strong proof-of-concept for fourth-generation microbicides based on click-chemistry-linked BMS derivatives.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com
