Paracrine signaling
Paracrine signaling is a type of cell communication that involves the transfer of signals from one cell to another cell in close proximity. Unlike endocrine signaling, which involves the transport of signals over long distances, paracrine signaling is localized and affects only nearby cells.
Overview
Paracrine signaling is a form of cell signaling in which the signaling molecules affect only nearby cells. These signaling molecules are secreted by cells into the extracellular fluid and act on nearby cells, influencing their behavior or function. This type of signaling is crucial in many biological processes, including cell growth, cell differentiation, and immune response.
Mechanism
The mechanism of paracrine signaling involves the secretion of signaling molecules by a cell into the extracellular fluid. These molecules then bind to specific receptors on the surface of nearby cells, triggering a response within these cells. The response can vary depending on the type of signaling molecule and the type of receptor it binds to.
Role in Physiology
Paracrine signaling plays a crucial role in various physiological processes. For instance, it is involved in the regulation of blood vessel growth, wound healing, and inflammation. It also plays a role in the immune system, where it helps to regulate the immune response.
Role in Pathology
Paracrine signaling can also play a role in various pathological conditions. For example, it is involved in the growth and spread of cancer cells. Cancer cells can secrete signaling molecules that stimulate the growth of blood vessels, providing the cancer cells with the nutrients they need to grow and spread.
See Also
References
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