159857-80-4Relevant articles and documents
Novel N-Methylated Cyclodepsipeptide Prodrugs for Targeted Cancer Therapy
Wu, Chunlei,Cheng, Zhehong,Lu, Danyi,Liu, Ke,Cheng, Yulian,Wang, Pengxin,Zhou, Yimin,Li, Meiqing,Shao, Ximing,Li, Hongchang,Su, Wu,Fang, Lijing
, p. 991 - 1000 (2021)
Coibamide A (1) is a highly N-methylated cyclodepsipeptide with low nanomolar antiproliferative activities against various cancer cell lines. In previous work, we discovered a simplified analogue, [MeAla3-MeAla6]-coibamide (1a), which exhibited the same inhibitory abilities as coibamide A. Herein, to reduce the whole-body toxicity and improve the solubility of 1a, two novel peptide-drug conjugates RGD-SS-CA (2) and RGD-VC-CA (3) were designed, synthesized, and evaluated. Composed of cyclodepsipeptide 1a, a tumor-homing RGD motif, and a conditionally labile linker, the conjugates are expected to release 1a tracelessly in specific tumor microenvironments. Compared with RGD-VC-CA (3), RGD-SS-CA (2) proved to be superior in in vitro drug release and cytotoxicity tests. Notably, intravenous injection of RGD-SS-CA (2) into mice-bearing human tumor xenografts induced significant tumor growth suppression with negligible toxicity. Therefore, as a novel prodrug of the coibamide A analogue, conjugate 2 has great potential for further exploration in cancer drug discovery.
Development of bifunctional anti-PD-L1 antibody MMAE conjugate with cytotoxicity and immunostimulation
Xiao, Dian,Luo, Longlong,Li, Jiaguo,Wang, Zhihong,Liu, Lianqi,Xie, Fei,Feng, Jiannan,Zhou, Xinbo
, (2021/09/27)
In recent years, tumor immunotherapy, especially the combination of PD1/PD-L1 inhibitors and chemotherapy, has developed rapidly. However, the systemic side effects induced by chemotherapy remain a crucial problem that needs to be addressed. Antibody drug conjugates (ADCs) are exceptional target-specific prodrugs that greatly improve the therapeutic window of chemotherapy drugs. Therefore, designing PD-L1-targeting ADCs is an interesting research project. In this study, we confirmed for the first time that the commercial anti-PD-L1 antibody Atezolizumab has better endocytosis efficiencies than Avelumab, and was more suitable for ADC design. Then, the most popular cytotoxic payload MMAE was conjugated to Atezolizumab via a classical dipeptide (valine-alanine) linker to generate a bifunctional PD-L1 ADC (ADC 3). An in vitro cytotoxicity test indicated the potent tumor cell inhibitory activity of ADC 3, with EC50 values of 9.75 nM to 11.94 nM. In addition, a co-culture of PBMCs in vitro proved that ADC 3 retained the immune activation effect of the Atezolizumab antibody. Moreover, ADC 3 exhibited a higher tumor inhibition rate and tumor regression rate in humanized immune system mice. To the best of our knowledge, this is the most active PD-L1-ADC reported thus far, which may promote the development of immunotherapy and novel ADCs.
DRUG ANTIBODY CONJUGATES
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, (2021/03/13)
Drug conjugates having formula [D-(X)b-(AA)w-(T)g-(L)-]n-Ab wherein: D is a drug moiety having the following formula (I) or a pharmaceutically acceptable salt or ester thereof, wherein D is covalently attached via a hydroxy group at OR1, OR3 or ZH, or a thiol group at ZH to (X)b if any, or (AA)w if any, or to (T)g if any, or (L); that are useful in the treatment of cancer.