Anti-TLN2 monoclonal antibody

Talin is an intracellular cytoskeletal protein and one of the major components of the focal adhesion complex. It mainly acts as an interlink between transmembrane integrin receptors and cytosolic F-actin. Apart from integrins and actin, it also interacts with various other proteins in the adhesion complex to regulate their functional dynamics. Talin undergoes a variety of post-translational modifications and they are implicated in the control of cell motility. There are two talin isoforms (talin1 and talin2) in mammals and they are encoded by TLN1 and TLN2 genes, respectively. Recent studies showed that both the isoforms have some mechanistic dissimilarities in terms of their interaction with membrane-bound integrins. Among the two isoforms, talin1 was well studied, and most of the information available till now comes from talin1. The present review is aimed to provide an updated overview on the cellular significance of talin in normal and cancerous cells.

Background: Talin-1 is a cytoskeleton protein that participates in cell migration and plays a role in tumor formation, migration, and metastasis in different types of cancer. Chinese investigators have observed that the levels of Talin-1 protein and mRNA expression in HCC tissues are significantly lower than in the adjacent non-cancerous tissue. However, Japanese investigators have reported that Talin-1 is upregulated in HCC. Tln2 as homologous gene of Tln-1, which encodes a very similar protein, but the role of Talin-2 is very little known in primary liver cancer (PLC). We investigated whether the expression of Talin-1 in PLC may be associated with the histological subtype as well as the role of Talin-1 in tumor cell invasion and migration using human hepatocellular carcinoma cell lines. Materials and Methods: We measured the mRNA expression levels of Talin-1 and Talin-2 in five human liver cancer cell lines and normal human liver cell (LO2 cell line) by real-time PCR and the protein expression levels of Talin-1 by Western blot. Migration and invasion of the cells were assessed using transwell assays and cell scratch experiments, respectively, and proliferation was assessed by soft AGAR colony formation. Results: Talin-1 and Talin-2 expression differed significantly between the five human liver cancer cell lines and LO2 cell line (p<0.05). Compared with the LO2 cell line, the invasion and migration capabilities of the five cancer cell lines differed significantly (p<0.05). Similarly, the colony-forming ability differed (p<0.05). Conclusions: High levels of Talin-1 expression are correlated with reduced invasion and migration as well as decreased malignancy in human liver cancer cell lines; the suppression of Talin-1 promotes invasion and migration. In addition, Talin-2 may be correlated with invasion and migration in human hepatocellular carcinoma.