System-wide paracrine pathways and endogenous receptors for secreted factors

System-wide paracrine pathways and endogenous receptors for secreted factors refers to the expansive biological framework of intercellular communication where cells release signaling molecules (the secretome) to modulate the behavior of nearby cells via specific cognate receptors. This system includes a diverse array of ligands such as cytokines, chemokines, growth factors, and peptide hormones, which interact with various receptor families including G protein-coupled receptors (GPCRs) and receptor tyrosine kinases (RTKs) (Uhlen et al., 2019, Science). These pathways are essential for coordinating physiological processes like tissue development, immune surveillance, and metabolic regulation across different organ systems. Dysregulation of these paracrine networks is central to the pathogenesis of many diseases, including the formation of the tumor microenvironment in cancer and the progression of chronic inflammatory disorders (Alberts et al., 2015, Molecular Biology of the Cell). Because this term describes a collective biological system rather than a single molecular entity, it is classified as a broad research category rather than a specific therapeutic target.

Other names

Secretome-receptor interaction networkParacrine signaling systemIntercellular communication pathwaysEndogenous ligand-receptor system

The mechanism of action varies depending on the specific ligand-receptor pair involved within the broader paracrine system, typically involving ligand binding, receptor conformational change, and downstream intracellular signaling cascades.