Protein tyrosine phosphatases (PTPs) are a large family of diverse molecules that play an important role in both activating and attenuating a wide variety of cellular responses. One of these phosphatases, protein tyrosine phosphatase 1B (PTP1B), is clearly involved in attenuating insulin signaling, and much effort has been devoted towards the development of inhibitors of this enzyme as a therapeutic approach to treat insulin resistance and type 2 diabetes. This review will focus on recent advances in the development of small molecule inhibitors for PTP1B and the challenges for generating selective molecules. This review is largely limited to papers published within the last two years, since a review on this subject was published recently in this journal.
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