In internal injury in body leukocyte is recruited by ?
**Core Concept**
The process of leukocyte recruitment to the site of internal injury is a complex phenomenon involving the coordinated action of various chemical signals, cellular interactions, and molecular mechanisms. This process is crucial for initiating the inflammatory response, which helps to protect the body from infection and tissue damage.
**Why the Correct Answer is Right**
Leukocyte recruitment is mediated by the release of chemokines and other pro-inflammatory cytokines from damaged tissues and immune cells. These signaling molecules interact with specific receptors on the surface of leukocytes, triggering their migration towards the site of injury. The most important chemokine involved in this process is C-X-C motif chemokine 1 (CXCL1), which binds to its receptor CXCR2 on neutrophils. This interaction leads to the activation of various signaling pathways, including the PI3K/Akt pathway, which promotes cell migration and adhesion.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a particular chemokine or receptor involved in leukocyte recruitment.
**Option B:** This option is incorrect because it is too broad and does not accurately describe the specific molecular mechanisms involved in leukocyte recruitment.
**Option C:** This option is incorrect because it is a general term that encompasses a range of cellular processes, but does not specifically address the question of leukocyte recruitment.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the inflammatory response is a double-edged sword: while it helps to protect the body from infection and tissue damage, it can also contribute to tissue damage and disease if it becomes excessive or chronic. This is known as "tissue damage-induced inflammation" or "inflammation-induced tissue damage".
**Correct Answer: D. CXCL1**