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Moumoujus

METHIONYL S-MELITTIN SP.

Avoid / SKIN PROTECTING

METHIONYL S-MELITTIN SP is a derivative based on Melittin, a primary peptide found in bee venom. It is recognized for its potent biological activities, including membrane disruption, immune modulation, and anti-inflammatory effects. While preclinical studies suggest therapeutic potential, its inherent toxicity necessitates careful consideration for topical applications.

Summary

anti-inflammatory antibacterial skin barrier support

Science

Mechanism of Action

The active component, Melittin, primarily functions by disrupting lipid bilayer membranes through pore formation, which can lead to cell lysis. It modulates intracellular calcium levels by inhibiting calmodulin, contributing to cell toxicity and death. Melittin also suppresses innate immune signaling pathways, specifically targeting TLR2, TLR4, CD14, NEMO, and PDGFRβ, resulting in reduced activation of p38, ERK1/2, AKT, PLCγ1, and decreased NF-κB translocation, thereby diminishing inflammatory responses. On the skin, it has been observed to regulate skin thickness, enhance filaggrin production, and reduce inflammatory cytokines, as well as exhibit antibacterial and antifungal properties, including the inhibition of P. acnes-induced inflammation.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 In vitro, Melittin (0.7-1.05 µM) induced apoptosis in various cancer cells (renal, prostatic, ovarian, breast, and leukemia).
  2. 02 Melittin concentrations as low as 1.85 ± 0.75 µg/mL induced growth inhibition in K562 leukemic cells in vitro.
  3. 03 A concentration of 4 µg/mL caused significant cell death in MDA-MB-231 cancer cells; however, concentrations below 2 µg/mL did not significantly impact cell survival.
  4. 04 In a mouse model of atopic dermatitis, unspecified concentrations mitigated ovalbumin-triggered skin symptoms, regulating skin thickness, increasing filaggrin levels, and reducing inflammatory cytokines.
  5. 05 In a mouse model of *Streptococcus pyogenes* skin infection, unspecified concentrations reduced inflammatory reactions and improved lesions.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Melittin's conformation shifts from random to alpha-helical at elevated pH values, with transitions noted around pK values of 6.8, 7.2, and 9.6 depending on concentration, indicating pH-sensitive activity. Storage at room temperature or freezer temperatures did not affect melittin content in honey bee venom over a six-month period.

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk High

Specific safety data for METHIONYL S-MELITTIN SP is unavailable; assessments are based on Melittin, a major component of bee venom. Melittin is a recognized biotoxin and a significant pain-inducing substance, exerting strong surface effects on cell membranes. It causes pore formation in epithelial cells and destruction of red blood cells, demonstrating non-specific cytotoxicity, degradation, and hemolytic activity. The median hemolytic concentration (HC50) against human red blood cells is 16.28 ± 0.17 µg/mL, and the median lethal concentration (LC50) against immature human dendritic cells is 43.42 ± 0.86 µg/mL. Its inherent toxicity severely limits direct topical use, leading to research into strategies like nanomodification to reduce cytotoxicity and enhance specificity.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy High
Comedogenicity Unknown

Our Assessment

Verdict

Avoid

Despite intriguing preclinical data on anti-inflammatory and antimicrobial effects, the significant inherent toxicity, non-specific cytotoxicity, and high irritancy profile of Melittin, upon which METHIONYL S-MELITTIN SP is based, render it unsuitable for direct application in precision skincare formulations.

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