Rigin (Palmitoyl Tetrapeptide-7)
Rigin is a palmitoylated tetrapeptide fragment of immunoglobulin G that modulates interleukin-6 production and matrix metalloproteinase activity. It is studied for its immunostimulatory, neurotrophic, and skin-rejuvenating properties.
Rigin (Palmitoyl Tetrapeptide-7) is a palmitoylated fragment of the IgG antibody (amino acids 341-344 of the human IgG heavy chain) that stimulates collagen production and inhibits inflammatory cytokines. It is of primary scientific interest for its ability to improve skin elasticity, firmness, and hydration through modulation of interleukin-6 and matrix metalloproteinase activity.
Overview
Rigin is a compound in which a fragment of immunoglobulin G (IgG) has been attached to a fatty acid residue (palmitoyl). The term "rigin" can refer either to the IgG fragment alone or to the full palmitoyl-Gly-Gln-Pro-Arg molecule. Originally developed as a potential immunostimulatory and neurotrophic peptide, rigin is still under active investigation for its ability to encourage nerve healing, particularly after burns and tissue grafts. More recently, interest has increased among researchers studying extracellular matrix (ECM) modulation, as rigin influences collagen and elastin synthesis and can improve skin elasticity and firmness in animal models.
Mechanism of Action
Rigin modulates the production of interleukin-6 (IL-6), a signaling molecule produced by T-cells that recruits immune cells to sites of injury or infection. When the immune response becomes excessive, it can damage healthy tissue, leading to breakdown of collagen and elastin in the extracellular matrix. By counteracting excessive IL-6 signaling, rigin reduces collateral immune-mediated skin damage.
Rigin also downregulates matrix metalloproteinases (MMPs), a group of enzymes involved in the breakdown of ECM proteins during normal tissue turnover. By reducing MMP activity, rigin allows cells that restore and maintain the ECM to better keep pace with the effects of aging. This dual action on IL-6 and MMPs is functionally similar, in some respects, to dehydroepiandrosterone (DHEA).
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Research
Immunostimulatory and Neurotrophic Effects
Rigin was developed after the related tetrapeptide tuftsin was found to have immunostimulatory and neurotrophic activities. Hydrophobic analogues of rigin have demonstrated immunomodulatory potential and protective effects against Plasmodium berghei infection in mouse models. Dutta et al. (2001) — Int. Immunopharmacol.
Anti-Inflammatory Skin Protection
Based on observations from animal research and human skin cell studies, rigin reduces the appearance of fine lines and wrinkles while evening out skin tone, improving elasticity, and increasing hydration. Rigin is often combined with other ingredients such as palmitoyl oligopeptide (as in Matrixyl 3000) to create synergistic effects that enhance skin rejuvenation.
Skin Rejuvenation and ECM Modulation
Research using matrix-assisted laser desorption/ionization mass spectrometric imaging, confocal microscopy, and histological analysis has demonstrated that peptide applications including rigin can modify dermal extracellular matrix and epidermal-dermal junction structure. These modifications are associated with improved skin elasticity and reduced signs of aging. Mondon et al. (2015) — J. Cosmet. Dermatol.
MMP Modulation
Matrix metalloproteinases play a central role in ECM degradation in both oral and skin tissues. By downregulating MMP activity, rigin can reduce ECM damage associated with aging and chronic inflammation. Sorsa et al. (2004) — Oral Dis.
Safety Profile
Rigin (Palmitoyl Tetrapeptide-7) is generally well-tolerated in topical formulations. As a cosmetic peptide ingredient, it has been used in commercially available skincare products with no significant adverse effects reported. No systemic toxicity data are available, as rigin is primarily administered topically. Individuals with known hypersensitivity to peptide-based cosmetic ingredients should exercise caution. No significant drug interactions have been identified in topical applications.
Pharmacokinetic Profile
- Half-life
- Not established
Quick Start
- Route
- Topical
Molecular Structure
- Formula
- C34H62N8O7
- Weight
- 694.9 Da
- CAS
- 221227-05-0
Research Protocols
oral
MMP Modulation Matrix metalloproteinases play a central role in ECM degradation in both oral and skin tissues.
topical
No systemic toxicity data are available, as rigin is primarily administered topically. No significant drug interactions have been identified in topical applications.
Interactions
Peptide Interactions
Rigin is often combined with other ingredients such as palmitoyl oligopeptide (as in Matrixyl 3000) to create synergistic effects that enhance skin rejuvenation.
Quality Indicators
What to look for
- Well-established safety profile
Frequently Asked Questions
References (5)
- [4]Resende et al — Anti-Aging Effects of Topical Peptides: Current Trends and Future Directions Cosmetics (2023)
- [6]
- [2]Mondon, P. et al Evaluation of dermal extracellular matrix modifications using MALDI-MSI J. Cosmet. Dermatol. (2015)
- [3]Sorsa, T., Tjaderhane, L. & Salo, T Matrix metalloproteinases (MMPs) in oral diseases Oral Dis. (2004)
- [1]Dutta, R. C., Puri, A. & Anand, N Immunomodulatory potential of hydrophobic analogs of Rigin Int. Immunopharmacol. (2001)
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