Pluripotency-Preserving Culture System for Pancreatic Stellate Cells Using MSC Medium: From Quiescence Maintenance to...

Pancreatic stellate cells (PSCs) play a central role in pancreatic physiology and disease, and the transition between their quiescent and activated states influences processes such as fibrosis and regeneration. However, the stem cell-like properties of PSCs remain unclear. This study aims to clarify the stem cell characteristics of PSCs and establish a method to maintain their quiescent state, thereby providing a new perspective on pancreatic regeneration.

PSCs from Lrat-cre; Rosa26-tdTomato mice were fate-traced, and immunofluorescence was used to assess Lrat, Oct4, and Nanog co-localization. Primary PSCs from C57BL/6 mice were cultured in mesenchymal stem cell (MSC) or DMEM/F12 medium. Lipid droplets, morphology, activation markers (α-SMA, collagen-I, fibronectin), and stemness-associated markers were analysed via qRT-PCR and immunofluorescence.

Lrat co-localized with Oct4/Nanog in mice. MSC-cultured PSCs had more lipid droplets, a quiescent morphology, and lower levels of activation markers than DMEM/F12-cultured cells. They also expressed stemness-associated markers (Pdx1, Oct4, Nkx6.1, Ngn3, Sox2, Pax6).

These results indicate that PSCs possess stemness and can be preserved under specific culture conditions. The ability of MSC medium to maintain PSCs in a quiescent and stem-like state provides a valuable model for studying their biology.

PSCs exhibit stemness, and MSC medium maintains their quiescence, offering a novel experimental platform to study PSC biology and lineage plasticity.