Vascular smooth muscle cells can produce extracellular matrix proteins, growth factors, and cytokines.

• A. Only ECM proteins
• B. True
• C. Only cytokines
• D. False

Answer: (B)

Vascular smooth muscle cells are not just contractile units; they actively synthesize and secrete multiple mediators that shape the vessel wall. In response to injury or during remodeling, these cells produce extracellular matrix proteins such as collagen and elastin, release growth factors like PDGF and TGF-β that stimulate their own proliferation and migration, and secrete cytokines and chemokines that modulate inflammation. Because they can generate all three categories—ECM proteins, growth factors, and cytokines—the statement is true. This broad secretory capacity helps explain their role in vascular remodeling and diseases like atherosclerosis, where ECM deposition, growth signaling, and inflammatory mediators work together to alter the vessel wall.