Bioactive Collagen Peptides and Fibroblast-Mediated Matrix Regeneration: From Peptide Absorption to Tissue Remodeling
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Abstract
Collagen peptides have emerged as bioactive nutritional compounds capable of influencing cellular signaling and extracellular matrix (ECM) remodeling. While classical studies (2003–2017) established the absorption of Pro-Hyp and Hyp-Gly di-/tripeptides and their stimulatory effects on fibroblasts, recent evidence (2020–2024) has expanded this model with clinically relevant outcomes across aging, sports recovery, joint health, and dermal regeneration. Following oral ingestion, hydrolyzed collagen undergoes enzymatic digestion, producing low–molecular-weight peptides that are transported across the intestinal barrier via PEPT1. These fragments accumulate in connective tissues, modulate TGF-β/SMAD and MAPK signaling pathways, and enhance COL1A1/COL3A1 transcription while reducing matrix metalloproteinase (MMP) activity. Modern randomized controlled trials and meta-analyses confirm improvements in skin elasticity, tendon remodeling, pain reduction, and functional performance in elderly and athletic populations. This review integrates molecular mechanisms with human clinical evidence and critically evaluates the limitations of current research, including methodological heterogeneity and dosage inconsistency. Understanding the collagen–fibroblast–ECM axis offers translational insights for regenerative medicine, lifestyle interventions, and musculoskeletal health, and this overview builds on these mechanisms by translating them into everyday recreational practice, providing a practical guide for specialists in recreation and lifestyle medicine.
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