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Peptide Messenger Systems

Meaning

Peptide Messenger Systems constitute the expansive and intricate network of signaling pathways that utilize short chains of amino acids, known as peptides, as their primary communication molecules to coordinate physiological functions across the entire organism. These diverse peptides act as crucial hormones, neurotransmitters, and autocrine/paracrine growth factors, mediating fundamental processes such as energy metabolism, reproduction, stress adaptation, and immune modulation. They represent a fundamental, highly specific layer of systemic communication distinct from the slower action of steroid hormones.