AI Article Synopsis
- The study focused on synthesizing and evaluating 7 new derivatives of PAC-1, with SM-1 emerging as the most effective in activating procaspase-3 and showing favorable pharmacokinetics.
- In vitro and in vivo tests revealed that SM-1 significantly enhanced caspase-3 activity, leading to increased cancer cell apoptosis while effectively reducing tumor size in mouse models.
- Preliminary safety tests indicated that SM-1 has a relatively low toxicity profile, making it a promising candidate for further evaluation as an antitumor treatment.
Article Abstract
Purpose: To develop more potent procaspase-3 activator, 7 novel derivatives of PAC-1 were synthesized and evaluated. Among them, SM-1 stood out for its promising activity and good pharmacokinetics properties. The purpose of this study is to elucidate the pharmacological mechanism of SM-1 and evaluate its efficacy and toxicity in-depth.
Methods: To reveal the effects of SM-1 on caspase-3 activity, both in vitro activation assay and in cells fluorometric assay were tested. The protein levels and distributions of procaspase-3 and cleaved caspase-3 were also measured by western blot and immunostaining. MTT assay, apoptosis assay and mouse xenograft model were applied to evaluate the efficacy of SM-1. Preliminary safety assessments also tested the acute toxicity and tissue distribution of SM-1.
Results: Compared to PAC-1, SM-1 showed higher cytotoxicity in cancer cells. Further investigation demonstrated that SM-1 relieved zinc-mediated inhibition of procaspase-3 and activated the caspase-3 activity both in tube test and in cells. Efficacy evaluation showed SM-1-induced cell apoptosis mainly via activation of caspase-3 and reduced tumor size in mouse xenograft model. Its apoptosis induction efficacy was higher than PAC-1. The preliminary safety assessment demonstrated that the overall LD50 of SM-1 lied between 500 and 1000 mg/kg and the distribution of SM-1 in brain was low.
Conclusions: We identified SM-1 as a promising antitumor candidate, which displayed enhanced procaspase-3 activating activity and potent cytotoxicity for cancer cells but low toxicity for normal cells.
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| http://dx.doi.org/10.1007/s00280-016-3115-6 | DOI Listing |
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