Abstract
Fibroblasts are involved in a number of functions regulated by different signal transduction pathways, including the phosphoinositide (PI) signaling system and related converting enzymes, such as phosphoinositide-specific phospholipase C (PI-PLC). The PI-PLC family comprises crucial effector enzymes in the PI signal transduction pathway. Once activated, PI-PLC cleaves an important membrane PI, the phosphatidylinositol (4,5) bisphosphate into inositol trisphosphate and diacylglycerol—both are crucial molecules in the transduction of signals. The activity of selected PI-PLC enzymes was reported in fibroblasts, although the complete panel of expression was not available. Each cell type expresses a group of selected PI-PLC isoforms, and knowledge of the panel of expression is a necessary and preliminary tool to address further studies. In the present study, we delineated the expression panel of PI-PLC enzymes in human skin fibroblasts. PI-PLC β1, PI-PLC β3, PI-PLC β4, PI-PLC γ1, PI-PLC γ2, PI-PLC δ1, PI-PLC δ3, PI-PLC δ4, and PI-PLC ϵ were expressed. PI-PLC β1 was weakly expressed, PI-PLC δ4 was inconstantly expressed, and PI-PLC γ2 was weakly expressed.
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