Matrixyl

Matrixyl Peptide

Matrixyl is a lipopeptide that combines fatty acids with amino acids. The peptide is also sometimes referred to as palmitoyl pentapeptide-4 or palmitoyl pentapeptide-3. The palmitoylated sequence of Lys-Thr-Thr-Lys-Ser-OH, which makes up the peptide, is posited to be a signal peptide fragment of the C-terminal propeptide of type I collagen.^[1] Researchers report that “The conjugation with the palmitoyl moiety [may] result in more [impactful] delivery across the skin and better stability to skin proteases.” Overall, this signal peptide is posited to act as a stimulus to fibroblasts and stimulate them into producing extracellular matrix (ECM) proteins such as collagen. Therefore, Matrixyl is considered by researchers to be a matrikine – a messenger peptide capable of regulating cell activities by interacting with their specific receptors.

Specifications

MOLECULAR WEIGHT: 802.05 g/mol

MOLECULAR FORMULA: C₃₉H₇₅N₇O₁₀

SEQUENCE: Pal-Lys-Thr-Thr-Ser-OH or Pal-KTTS-OH

SYNONYMS: palmitoyl pentapeptide-3

Matrixyl Research

Matrixyl and Fibroblasts
Fibroblasts are cells responsible for producing collagen, a key structural protein in dermal tissues. When skin cells are exposed to varying amounts of Matrixyl, scientists have observed what appeared to be a concentration-dependent increase in collagen synthesis, particularly at concentrations near a specific threshold called the critical aggregation concentration (CAC).^[2] The CAC is the concentration at which Matrixyl molecules begin to self-assemble into larger nanostructures. One possible explanation for the increased collagen production is that Matrixyl may self-assemble around the CAC, forming organized nanostructures like nanotapes or fibrils.

These formations are thought to present the peptide sequences in a configuration that supports their interaction with fibroblasts, potentially leading to increased collagen synthesis. The specific arrangement of peptides within these nanostructures might make it easier for fibroblasts to recognize and respond to them, thereby promoting collagen deposition. Interestingly, while Matrixyl seemed to reduce the rate at which fibroblasts divide—a process referred to as cell proliferation—the amount of collagen produced by each cell appeared to increase. This observation might suggest that Matrixyl encourages fibroblasts to prioritize collagen production over cell division.

Further research suggests that by potentially boosting collagen production by fibroblasts, Matrixyl might counteract the degradation of the dermal matrix associated with photoaging.^[3] This degradation is often linked to the formation of wrinkles and a loss of skin structure elasticity. Therefore, Matrixyl may be a promising candidate for laboratory research focused on mitigating dermal cell photoaging by supporting the skin’s structural support through collagen synthesis.

Matrixyl and Wound Closure
Researchers investigating Matrixyl have noted that the “delicate balance between the wound healing properties and pro-fibrotic abilities of pentapeptide should be considered” in the context of wound closure.^[4] More specifically, it is believed that Matrixyl may modulate fibroblast activity, particularly in relation to the trans-differentiation of fibroblasts into myofibroblasts—a key process in wound contraction and scar formation. Myofibroblasts are posited to contribute to wound closure through their contractile ability and may thus lead to excessive scarring if they persist beyond the normal healing period. Experimental studies have examined how Matrixyl is thought to impact the expression of alpha-smooth muscle actin (a-SMA) and connective tissue growth factor (CTGF), both of which are associated with fibrotic processes.

Observations indicate that Matrixyl may reduce the expression of a-SMA in fibroblasts. This reduction suggests a possible decrease in the formation of myofibroblasts, which may influence the extent of wound contraction and scarring. Additionally, Matrixyl may influence CTGF levels, which play a role in collagen production and extracellular matrix remodeling. By potentially modulating CTGF expression, Matrixyl is believed to impact the balance between tissue repair and fibrotic scarring potentially. The interplay between CTGF and a-SMA is significant because sustained overexpression of these proteins is associated with fibrotic tissue formation.

In experimental murine models, Matrixyl has been investigated for its potential role in supporting tissue healing.^[5] Matrixyl has been posited to reach fibroblasts in the dermis, possibly binding to cell surface receptors and activating signaling pathways similar to the TGF-β pathway. This activation may potentially lead to increased collagen production and inhibition of collagenase activity, thereby potentially supporting extracellular matrix formation. Studies suggest that Matrixyl might accelerate wound closure and support collagen density compared to controls. The scientists commented that “the macroscopic results [indicated] that wound healing was [raised] from 63.5 up to 81.81% in [Matrixyl] groups compared to that in the negative control group.” These observations imply that Matrixyl has the potential to be an agent that promotes tissue repair and regeneration in laboratory settings.

Matrixyl and Wrinkles
Researchers suggest that Matrixyl may stimulate different types of collagen, including types I, III, and IV. Other ECM proteins like elastin, fibronectin, and glycosaminoglycans may also be upregulated. By possibly supporting the synthesis of these structural proteins, Matrixyl may contribute to better-supported tissue firmness and elasticity, potentially reducing the appearance of wrinkles. Experimental observations have apparently indicated that formulations containing Matrixyl might lead to quantitative decreases in wrinkle depth and thickness, as well as support for tissue firmness.^[6] For instance, reductions in fold depth by 18 percent, fold thickness by 37 percent, and increases in firmness by 21 percent have been reported in certain settings.

These findings suggest that Matrixyl has the potential to affect tissue properties related to wrinkling positively. Furthermore, laboratory studies utilizing advanced topometric techniques like Fast Optical Topometry and Matrixyl have apparently posited additional support in dermal layer roughness parameters.^[7] Specifically, reductions in mean dermal layer roughness and maximum dermal roughness have been observed in research models. Additionally, meaningful changes were observed, which may indicate a decrease in wrinkle depth and support of overall dermal tissue smoothness.

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