Frankie Chi Fat Ko

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Deleted in liver cancer 1 (DLC1) is a recently identified tumor suppressor gene frequently underexpressed in hepatocellular carcinoma (HCC). DLC1 encodes a Rho GTPase-activating protein domain that exhibits growth-suppressive activity in HCC cell lines. Our recent finding has revealed that inhibition of Rho-mediated actin stress fiber formation by DLC1 is(More)
BACKGROUND & AIMS Deleted in liver cancer 1 (DLC1), which encodes a Rho GTPase activating protein, is a bona fide tumor suppressor in hepatocellular carcinoma. Underexpression of DLC1 in cancer has been attributed to genomic deletion and epigenetic silencing. However, the regulatory mechanism of the tumor suppressive activity of DLC1 remains elusive. In(More)
Tensins are a new family of proteins that act as an important link among extracellular matrix, actin cytoskeleton, and signal transduction and have been implicated in human cancers. Tensin2 was initially identified in a search for new tensin family members that share extensive sequence homology with tensin1. Tensin2 was highly expressed in liver tissues. A(More)
Caveolin-1 (Cav1) has been implicated in diverse human cancers, yet its role in hepatocellular carcinoma (HCC) tumourigenesis and metastasis remains elusive. In the current study, we aim to provide a comprehensive understanding regarding the functional role of Cav1 in HCC tumourigenesis and metastasis. Cav1 expression was examined in a panel of human HCC(More)
The deleted in liver cancer 1 (DLC1) tumor suppressor is an important RhoGTP activating protein (RhoGAP) that plays a crucial role in many types of human cancers. Small GTPases regulate normal cellular processes but aberrant expression and activation of GTPases contribute to tumorigenesis. RhoGAP suppresses Rho activity. DLC1's RhoGAP activity and the focal(More)
Deleted in Liver Cancer 1 (DLC1) is a tumour suppressor that encodes a RhoGTPase-activating protein (RhoGAP) and is frequently inactivated in many human cancers. The RhoGAP activity of DLC1 against Rho signalling is well documented and is strongly associated with the tumour suppressor functions of DLC1. However, the mechanism by which the RhoGAP activity of(More)
BACKGROUND Integrin-linked kinase (ILK) was first discovered as an integrin β1-subunit binding protein. It localizes at the focal adhesions and is involved in cytoskeleton remodeling. ILK overexpression and its dysregulated signaling cascades have been reported in many human cancers. Aberrant expression of ILK influenced a wide range of signaling pathways(More)
BACKGROUND Deleted in liver cancer 1 (DLC1) is a Rho GTPase-activating protein (RhoGAP) frequently deleted and underexpressed in hepatocellular carcinoma (HCC) as well as in other cancers. Recent independent studies have shown interaction of DLC1 with members of the tensin focal adhesion protein family in a Src Homology 2 (SH2) domain-dependent mechanism.(More)
Sensory ray morphogenesis in C. elegans requires active cellular interaction regulated by multiple genetic activities. We report here the cloning of one of these genes, dpy-11, which encodes a membrane-associated thioredoxin-like protein. The DPY-11 protein is made exclusively in the hypodermis and resides in the cytoplasmic compartment. Whereas the TRX(More)
BACKGROUND Deleted in liver cancer (DLC) is a family of tumour suppressors that plays a critical role in hepatocellular carcinoma (HCC). AIMS This study aimed to document the expression profiles of the three known DLC1 isoforms (alpha, beta and gamma) in normal human tissues and human HCCs and address their functional and regulatory differences. We also(More)