Host defense effector molecules in mucosal secretions.
Tjabringa. G Sandra GS; Vos. Joost B JB; Olthuis. Diana D; Ninaber. Dennis K DK; Rabe. Klaus F KF; Schalkwijk. Joost J; Hiemstra. Pieter S PS; Zeeuwen. Patrick L J M PL
Key Findings
- Seminal plasma contains the highest concentrations of LL‑37 among the fluids tested
- Each mucosal secretion has a distinct profile of antimicrobial peptides and proteinase inhibitors
- LL‑37 is present alongside other inhibitors like SLPI, elafin, and cystatin in various secretions
Practical Outcomes
- Knowing that LL‑37 is naturally abundant in semen suggests it plays a key role in protecting the male reproductive tract. For biohackers, this reinforces the importance of supporting overall mucosal health, but the paper does not provide a dosage or supplementation protocol for LL‑37.
Summary
The study measured the natural levels of the antimicrobial peptide LL‑37 and other protective proteins in different body fluids, finding that semen has especially high amounts of LL‑37 and related inhibitors, while each fluid has its own unique mix. This tells us where the body naturally concentrates this peptide but doesn’t give a new way to use it.
Abstract
Mucosal secretions contain a range of defense effector molecules including antimicrobial peptides and proteinase inhibitors. These molecules play a central role in host defense against infection, and in a variety of immune and inflammatory reactions. The aim of this study was to analyze the levels of neutrophil defensins, the cathelicidin hCAP-18/LL-37, and the proteinase inhibitors secretory leukocyte proteinase inhibitor, SKALP/elafin and cystatin M/E in various mucosal secretions and urine. We show here that especially seminal plasma is characterized by high concentrations of hCAP-18/LL-37, SLPI, SKALP/elafin and cystatin M/E. The results of this study demonstrate that each mucosal secretion is characterized by a unique profile of effector molecules, which may supply individual mucosal secretions with specific properties related to the control of local infection and inflammation.
Study Information
pubmed
2005
2005-04-09T00:00:00.000Z
10.1016/j.femsim.2005.03.004