Paracrine signals

Definition

Paracrine signals are a form of cell signaling where the target cells are in close proximity to the signal-releasing cell. These signals typically involve the release of signaling molecules that affect nearby cells within a short distance.

5 Must Know Facts For Your Next Test

1. Paracrine signaling is essential for processes such as inflammation and tissue repair.
2. Signaling molecules involved in paracrine signaling often include growth factors, cytokines, and neurotransmitters.
3. Unlike endocrine signaling, paracrine signals do not travel through the bloodstream.
4. The effects of paracrine signals are usually localized due to their rapid breakdown or uptake by nearby cells.
5. Paracrine signaling can influence various cellular activities including proliferation, differentiation, and apoptosis.

Review Questions

Related terms

Autocrine Signals: Cell signaling where a cell targets itself with the released signal.

Endocrine Signals: Long-distance cell communication involving hormone release into the bloodstream to target distant cells.

Juxtacrine Signals: Direct cell-to-cell communication where signals pass through membrane-bound proteins without diffusing away.