part of part of capable of fibroblast secretory cell intestinal lamina propria fibroblast 2024-09-24T15:45:18Z S1 fibroblast A fibroblast located in the lamina propria of the intestinal mucosa. This cell expresses PDGFRα and CD81 and is negative for α-smooth muscle actin (α-SMA). This cell is predominantly located in the small intestine adjacent to myofibroblasts surrounding the crypts. It is capable of synthesizing extracellular matrix components and structural proteins such as collagen and elastin. extracellular matrix constituent secretion gastrointestinal system lamina propria