Immortalized Rat Hepatic Stellate Cells (HSC-T6)

The HSC-T6 cell line is an immortalized rat hepatic stellate cell (HSC) line established by SV40 large T‑antigen transfection of primary stellate cells isolated from an adult male Sprague‑Dawley rat. Hepatic stellate cells are perisinusoidal liver cells specialized in vitamin A (retinoid) storage; upon liver injury they transdifferentiate into activated myofibroblasts, the principal source of extracellular matrix (ECM) in hepatic fibrosis.

The primary advantage of HSC‑T6 is its constitutively activated, myofibroblast‑like phenotype that faithfully recapitulates fibrogenic HSCs without the need for exogenous activation. Unlike quiescent primary HSCs, which spontaneously activate on plastic and exhibit substantial donor‑to‑donor variability, HSC‑T6 provides a homogeneous, reproducible, and unlimited cell supply for mechanistic studies. The cells robustly express fibrotic markers including α‑smooth muscle actin (α‑SMA), glial fibrillary acidic protein (GFAP), and desmin, and secrete TGF‑β, type I collagen, and other ECM components, closely mimicking the activated HSC phenotype in fibrotic liver.

Additional advantages include rapid growth (doubling time ~10 hours), high homogeneity, experimental reproducibility, and the ability to overcome ethical and technical challenges associated with primary HSC isolation-which is time‑consuming, yields low cell numbers, and is subject to significant lot‑to‑lot variation. HSC‑T6 is also amenable to high‑throughput drug screening and has extensive molecular characterization, including a defined short‑tandem‑repeat (STR) profile and transcriptome analysis, ensuring reliable cell authentication. Owing to these features, HSC‑T6 has become a gold‑standard in vitro model for studying hepatic fibrosis, retinoid metabolism, and the pathophysiology of chronic liver diseases such as cirrhosis, as well as for evaluating novel anti‑fibrotic therapies.