Additive effects of orexin B and vasoactive intestinal polypeptide on LL-37-mediated antimicrobial activities.
Ohta. Kouji K; Kajiya. Mikihiko M; Zhu. Tongbo T; Nishi. Hiromi H; Mawardi. Hani H; Shin. Jane J; Elbadawi. Leena L; Kamata. Nobuyuki N; Komatsuzawa. Hitoshi H; Kawai. Toshihisa T
Key Findings
- Orexin B and VIP kill bacteria in low‑salt conditions but lose potency at physiological salt levels
- Adding LL‑37 restores the bactericidal activity of orexin B and VIP in normal salt concentrations
- The combined effect works against several bacteria including E. coli, P. aeruginosa, S. mutans, and S. aureus
Practical Outcomes
- For biohackers interested in boosting innate immunity, formulations that include LL‑37 together with orexin B or VIP might offer stronger antimicrobial protection in the body’s salty environments. However, the research is still early‑stage and does not provide dosing guidelines or safety data, so any real‑world use would need careful formulation and further testing.
Summary
The study found that two brain‑derived peptides, orexin B and VIP, can kill common bacteria, but only when salt levels are low. In normal body‑like salt (150 mM), their killing power drops, but adding the natural antimicrobial peptide LL‑37 brings the effect back, showing they work together to fight microbes.
Abstract
The present study examined the bactericidal effects of orexin B (ORXB) and vasoactive intestinal peptide (VIP) alone or combined with cationic antimicrobial peptides, such as LL-37, on Escherichia coli, Pseudomonas aeruginosa, Streptococcus mutans and Staphylococcus aureus. The bactericidal effect of ORXB or VIP alone was detected in low NaCl concentration, but attenuated in physiological NaCl concentration (150 mM). However, such attenuated bactericidal activities of ORXB and VIP in 150 mM NaCl were regained by adding LL-37. Therefore, our results indicate that VIP and ORXB appear to mediate bactericidal effects in concert with LL-37 in the physiological context of mucosal tissue.
Study Information
pubmed
2010
2010-12-21T00:00:00.000Z
10.1016/j.jneuroim.2010.11.009
22
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