Particularly Interesting New Cysteine-Histidine-rich protein 1 (PINCH-1) (PINCH-1)

Particularly Interesting New Cysteine-Histidine-rich protein 1 (PINCH-1), also known as LIMS1, is a highly conserved adaptor protein composed of five LIM domains that facilitate diverse protein-protein interactions. It is a core component of the heterotrimeric ILK-PINCH-Parvin (IPP) complex, which serves as a critical bridge between the extracellular matrix and the actin cytoskeleton by interacting with integrin-linked kinase (ILK). Through this complex, PINCH-1 regulates essential cellular processes including adhesion, spreading, migration, and survival signaling, primarily by modulating the PI3K/AKT and Ras/MAPK pathways. Beyond its role at focal adhesions, PINCH-1 can also translocate to the nucleus to act as a transcriptional regulator, particularly in specialized cells like podocytes. In pathological contexts, PINCH-1 is frequently overexpressed in various malignancies, including pancreatic, lung, and breast cancers, where it promotes tumor growth, epithelial-to-mesenchymal transition (EMT), and metastasis. It also plays a significant role in the progression of fibrotic diseases, such as renal and pulmonary fibrosis, by promoting fibroblast activation and survival. While no drugs targeting PINCH-1 are currently FDA-approved, it is an active area of preclinical research. Experimental strategies include the use of siRNAs delivered via nanocarriers and the development of small-molecule inhibitors to disrupt the IPP complex. Recent studies also suggest its potential as an immunotherapeutic target, where blocking PINCH-1 may enhance the innate immune system's ability to eliminate cancer cells by acting as a "don't-eat-me" signal.

Other names

LIMS1PINCHPINCH1LIM and senescent cell antigen-like domains 1Renal carcinoma antigen NY-REN-48Senescent cell antigen