OBJECTIVE: Altered actin isoform expression occurs in some pathological conditions including muscular malignancies. This study was to investigate whether a similar event occurs in hepatocellular carcinoma. METHODS: Cellular RNA was extracted from cancerous and non-cancerous hepatoma tissues. Reverse transcription (RT)-PCR followed by cloning and sequencing was performed to obtain populations of actin sequences. Phylogenetic analysis was carried out to identify novel actin isoforms. Interaction between the novel actin isoform and other cellular proteins was examined by the yeast two-hybrid system. The relative amounts of the novel actin isoform in the cancerous and non-cancerous tissues were further assayed using real-time PCR with specific primers. RESULTS: When compared between the cancerous and non-cancerous tissues, the proportion of non-beta-actins in the cancerous parts increased significantly in three of four cases included. Among the non-beta-actins, a novel group of isoforms was identified, temporarily named kappa-actins. Two genetically closely related sequences, FKSG30 and an actin-like sequence in the Cat Eye syndrome region, were found to cluster with the kappa-actins. Protein interaction assay indicated that the interaction between kappa-actin and prefoldin 2 was greatly diminished. The relative amounts of kappa-actin increased in 12 of 20 cancerous tissues assayed. CONCLUSIONS: A novel class of actin isoforms was expressed in some hepatocellular carcinoma tissues, replacing beta-actins to become the major constituents of actin cytoskeleton.
OBJECTIVE: Altered actin isoform expression occurs in some pathological conditions including muscular malignancies. This study was to investigate whether a similar event occurs in hepatocellular carcinoma. METHODS: Cellular RNA was extracted from cancerous and non-cancerous hepatoma tissues. Reverse transcription (RT)-PCR followed by cloning and sequencing was performed to obtain populations of actin sequences. Phylogenetic analysis was carried out to identify novel actin isoforms. Interaction between the novel actin isoform and other cellular proteins was examined by the yeast two-hybrid system. The relative amounts of the novel actin isoform in the cancerous and non-cancerous tissues were further assayed using real-time PCR with specific primers. RESULTS: When compared between the cancerous and non-cancerous tissues, the proportion of non-beta-actins in the cancerous parts increased significantly in three of four cases included. Among the non-beta-actins, a novel group of isoforms was identified, temporarily named kappa-actins. Two genetically closely related sequences, FKSG30 and an actin-like sequence in the Cat Eye syndrome region, were found to cluster with the kappa-actins. Protein interaction assay indicated that the interaction between kappa-actin and prefoldin 2 was greatly diminished. The relative amounts of kappa-actin increased in 12 of 20 cancerous tissues assayed. CONCLUSIONS: A novel class of actin isoforms was expressed in some hepatocellular carcinoma tissues, replacing beta-actins to become the major constituents of actin cytoskeleton.
Authors: Anuradha Radhakrishnan; Dawn Yeo; Gaie Brown; Myint Zu Myaing; Laxmi Ravi Iyer; Roland Fleck; Boon-Huan Tan; Jim Aitken; Duangmanee Sanmun; Kai Tang; Andy Yarwood; Jacob Brink; Richard J Sugrue Journal: Mol Cell Proteomics Date: 2010-06-08 Impact factor: 5.911
Authors: Marie-Claire Maroun; Ofelia Olivero; Leonard Lipovich; Azadeh Stark; Larry Tait; Sudeshna Bandyopadhyay; Matthew Burke; Richard Zarbo; Dhananjay Chitale; S David Nathanson; Mike Long; Carol Peebles; Félix Fernández Madrid Journal: Immunol Res Date: 2014-12 Impact factor: 2.829