Found 2 results
Review
21 December 2023TANGO1 Dances to Export of Procollagen from the Endoplasmic Reticulum
ABSTRACT: The endoplasmic reticulum (ER) to Golgi secretory pathway is an elegantly complex process whereby protein cargoes are manufactured, folded, and distributed from the ER to the cisternal layers of the Golgi stack before they are delivered to their final destinations. The export of large bulky cargoes such as procollagen and its trafficking to the Golgi is a sophisticated mechanism requiring TANGO1 (Transport ANd Golgi Organization protein 1. It is also called MIA3 (Melanoma Inhibitory Activity protein 3). TANGO1 has two prominent isoforms, TANGO1-Long and TANGO1-Short, and each isoform has specific functions. On the luminal side, TANGO1-Long has an HSP47 recruitment domain and uses this protein to collect collagen. It can also tether its paralog isoforms cTAGE5 and TALI and along with these proteins enlarges the vesicle to accommodate procollagen. Recent studies show that TANGO1-Long combines retrograde membrane flow with anterograde cargo transport. This complex mechanism is highly activated in fibrosis and promotes the excessive deposition of collagen in the tissues. The therapeutic targeting of TANGO1 may prove successful in the control of fibrotic disorders. This review focuses on TANGO1 and its complex interaction with other procollagen export factors that modulate increased vesicle size to accommodate the export of procollagen.
Communication
21 March 2023Established Hepatic Stellate Cell Lines in Hepatology Research
Hepatic stellate cells comprise a minor cell population in the liver that plays a key role in the pathogenesis of hepatic fibrosis. In chronic liver damage, they undergo a transition from a quiescent to a highly proliferative phenotype with the capacity to synthesize large quantities of extracellular matrix compounds such as collagens. Because of their pivotal role in liver disease pathogenesis, this hepatic cell population has become into the focus of liver research for many years. However, the isolation of these cells is time consuming and requires trained laboratory personnel. In addition, working with primary cells requires the following of ethical and legal standards that need to be approved by the respective authorities. Therefore, continuous growing hepatic stellate cells have become very popular in research laboratories because they are widely available, easy to handle, allow a continuous supply of materials, and further allow reduction of lab animal use in biomedical research. This communication provides some general information about immortalized hepatic stellate cell lines from mouse, rats and humans.
