Which of the following collagen is involved/expressed in early wound healing
**Core Concept**
Type III collagen is an essential component of the early wound healing process. It is a major fibrillar collagen found in loose connective tissue, which is abundant in the early stages of wound repair. The rapid deposition of Type III collagen provides a provisional matrix that supports the infiltration of inflammatory cells and the migration of fibroblasts.
**Why the Correct Answer is Right**
Type III collagen is synthesized by fibroblasts and is deposited in the wound area within hours after injury. The rapid accumulation of Type III collagen facilitates the formation of a provisional matrix, which is essential for the migration and proliferation of fibroblasts and the eventual deposition of Type I collagen. The expression of Type III collagen is upregulated in response to wound injury and is a key event in the initiation of the wound healing process.
**Why Each Wrong Option is Incorrect**
**Option A:** Type I collagen is a major component of the skin and other connective tissues, but it is primarily involved in the later stages of wound healing, when the provisional matrix is replaced by a more stable collagenous matrix.
**Option B:** Type IV collagen is a component of the basement membrane, which separates epithelial cells from underlying connective tissue. While it plays a role in tissue repair, it is not specifically involved in the early stages of wound healing.
**Option C:** Type V collagen is a minor fibrillar collagen that is often associated with Type I collagen. It is not as prominently expressed in the early stages of wound healing as Type III collagen.
**Clinical Pearl / High-Yield Fact**
The early stages of wound healing are characterized by the rapid deposition of a provisional matrix, which is rich in Type III collagen. This matrix provides a scaffold for the infiltration of inflammatory cells and the migration of fibroblasts, ultimately leading to the repair of damaged tissue.
**Correct Answer:** C.