Medicinal Aspects of PTP 1B Inhibitors as Anti-Breast Cancer Agents: An Overview.

Protein tyrosine phosphatase 1B (PTP1B) has gained interest as a therapeutic target for type 2 diabetes and obesity. Besides metabolic signalling, PTP1B is a positive regulator of signalling pathways linked to ErbB2-induced breast tumorigenesis. Substantial evidence proves that its overexpression is involved in breast cancer, which suggests that selective PTP1B inhibition might be effective in breast cancer treatment. Therefore, huge research is being carried out on PTP1B inhibitors and their activity against breast cancer development. To date, only two PTP1B inhibitors, viz. ertiprotafib and trodusquemine, have entered clinical trials. The discovery of selective inhibitors of PTP1B could open a new avenue in breast cancer treatment. In this review, we provide an extensive overview on the involvement of PTP1B in breast cancer, its pathophysiology, with special attention on the discovery and development of various natural as well as synthetic PTP1B inhibitors. This study will provide significant information to the researchers developing PTP1B inhibitors for breast cancer treatment.

Recent Advancements in the Discovery of MDM2/MDM2-p53 Interaction Inhibitors for the Treatment of Cancer.

Discovery of MDM2 and MDM2-p53 interaction inhibitors changed the direction of anticancer research as it is involved in about 50% of cancer cases globally. Not only the inhibition of MDM2 but also its interaction with p53 proved to be an effective strategy in anticancer drug design and development. Various molecules of natural as well as synthetic origin have been reported to possess excellent MDM2 inhibitory potential. The present review discusses the pathophysiology of the MDM2-p53 interaction loop and MDM2/MDM2-p53 interaction inhibitors from literature covering recent patents. Focus has also been put on characteristic features of the active site of the target and its desired interactions with the currently FDA-approved inhibitor. The designing approach of previously reported MDM2/MDM2-p53 interaction inhibitors, their SAR studies, in silico studies, and the biological efficacy of various inhibitors from natural as well as synthetic origins are also elaborated. An attempt is made to cover recently patented MDM2/MDM2- p53 interaction inhibitors.