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Melanocortin receptor agonists and antagonists act on MC1R to MC5R, five receptors for melanocortin peptides. These peptides derive from proopiomelanocortin and include α-melanocyte-stimulating hormone (α-MSH) and adrenocorticotropic hormone (ACTH). Genes for the MSH receptor (MC1R) and the ACTH receptor (MC2R) were cloned in 1992. MC1R controls skin and hair pigmentation, while MC4R in the hypothalamus regulates feeding and energy balance. In a 1997 study, mice with a targeted disruption of the MC4R gene became obese. The list holds α-MSH, the ACTH fragment tetracosactide, and the cyclic peptides melanotan II and bremelanotide acetate. Setmelanotide and PF-00446687 are MC4R agonists, and JNJ-10229570 blocks MC1R and MC5R. Melanogenesis inhibitors such as orcinol are included as well, for pigmentation studies.
Synonyms: (E/Z)-Terrestribisamide
N,N′-Diferuloylputrescine acts as a pigment inhibitor, showing a 57% reduction in pigmentation. It also considerably diminishes the protein expression of MITF and displays potent antioxidant properties as a radical scavenger against reactive oxygen species.
Synonyms: 3,5-Dihydroxytoluene
Orcinol (3,5-Dihydroxytoluene) is a melanogenesis inhibitor targeting the MAPK/ERK signaling pathway. It effectively reduces melanogenesis in B16F10 cells by downregulating the expression of key melanogenic enzymes, including MITF, tyrosinase (TYR), TRP1, and DCT. Additionally, Orcinol demonstrates DPPH radical scavenging activity and can influence nitrogen balance in animal models. This compound is relevant for research applications in cancer and metabolic diseases, making it a valuable reagent in biochemical studies.
Synonyms: LILLY-53858
Fenoprofen (LILLY-53858) is a nonsteroidal anti-inflammatory drug (NSAID) that functions primarily by inhibiting cyclooxygenase (COX) enzymes, thereby reducing the synthesis of pro-inflammatory prostaglandins. In addition to its classical NSAID activity, Fenoprofen has been identified as a positive allosteric modulator (PAM) of melanocortin receptors (MCRs), enhancing MCR-mediated signaling. Fenoprofen also promotes ERK1/2 activation in HEK293T cells, suggesting additional modulation of intracellular signaling pathways involved in inflammation and cellular proliferation.
6-O-Isobutyrylbritannilactone is a natural melanogenesis inhibitor derived from the flowers of Inula britannica. This sesquiterpene effectively inhibits IBMX-induced melanin production in B16F10 melanoma cells. Additionally, 6-O-Isobutyrylbritannilactone modulates key signaling pathways, including ERK, PI3K/AKT, and CREB, demonstrating significant antimelanogenic activity in zebrafish embryo models. Its properties make it a valuable reagent for research focused on pigment biology and skin disorders.
Raspberry ketone glucoside is a melanogenesis inhibitor that primarily targets the IL6/JAK1/STAT3 signaling pathway. It effectively reduces melanogenesis by inhibiting the transcriptional activity of MITFa and downregulating the expression levels of key genes such as TYR and TYRP1a. This compound demonstrates significant whitening activity in both B16F10 cells in vitro and zebrafish models in vivo, making it a valuable tool for research in skin pigmentation and related fields.
Cadin-1(14)-ene-7a,11-diol is a sesquiterpene alcohol that functions as a melanogenesis inhibitory agent. It effectively suppresses melanin production in B16 melanoma cells stimulated by α-MSH, demonstrating potential application in skin-whitening treatments. This compound is valuable for research exploring mechanisms of pigmentation and therapies for hyperpigmentation disorders.
Synonyms: Isodocarpin
(-)-Isodocarpin is a diterpenoid that acts as a potent melanogenesis inhibitor, exhibiting an IC50 of 0.19 μM in B16 4A5 cell lines. This compound effectively suppresses the expression of key melanogenic enzymes, including tyrosinase, tyrosine-related protein (TRP)-1, and TRP-2 mRNA. (-)-Isodocarpin is valuable for research applications focused on skin pigmentation, melanin synthesis, and related dermatological studies.
Melanostatin, frog is a potent inhibitor of α-melanocyte-stimulating hormone (α-MSH) release, exhibiting an IC50 value of 60 nM. This peptide is primarily utilized in studies investigating melanogenesis and the regulation of pigment production. Its effects on α-MSH make it a valuable tool for research applications focusing on skin biology, obesity, and related metabolic pathways.
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IIIM-8 is a melanogenesis inhibitor that effectively suppresses pigment production in both in vitro and in vivo models. This compound shows no cytotoxicity in Human Adult Epidermal Melanocytes (HAEM), making it a suitable candidate for research in hyperpigmentation disorders. Its mechanism of action supports studies aimed at understanding melanin synthesis and skin pigmentation regulation.
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Chlorophorin is an inhibitor of the Melanocortin Receptor, effectively reducing tyrosinase activity and melanogenesis. This compound demonstrates significant inhibition of α-melanocyte-stimulating hormone-induced melanin production in B16F10 melanoma cells, making it valuable for research on pigmentation disorders and melanoma. Its mechanism of action provides insights into the modulation of skin pigmentation and potential therapeutic strategies.
Synonyms: (-)-Lirinidine
(R)-Lirinidine is an aporphine-type alkaloid derived from Nelumbo nucifera, known for its role as a melanogenesis inhibitor. With an IC50 value of 19.3 μM, it effectively reduces melanin production, making it valuable for research in skin pigmentation disorders. Additionally, (R)-Lirinidine exhibits cytotoxic effects at concentrations of 100 μM, highlighting its potential in various biological studies.
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Amphistin is a melanogenesis inhibitor derived from actinomycetes. It effectively suppresses melanin production in B16 melanoma cells while demonstrating no significant impact on cellular growth. This compound is of interest for research applications focused on hyperpigmentation disorders and skin-related studies.
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Albocycline K3 acts as a melanogenesis inhibitor and is derived from microbial sources. This compound effectively reduces melanin production, making it suitable for research in skin biology and pigmentation disorders. Its unique mechanism of action provides valuable insights into the modulation of melanin synthesis and may aid in the development of therapies for conditions such as hyperpigmentation.
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Melanocin A is a potent melanin biosynthesis inhibitor that specifically targets tyrosinase, demonstrating an IC50 of 9.0 nM and a MIC of 0.9 μM. This compound effectively reduces melanin production and exhibits antioxidant properties, making it valuable for research into skin pigmentation disorders and oxidative stress-related conditions. Melanocin A can be utilized in studies examining the regulation of melanogenesis and potential therapeutic approaches for hyperpigmentation.
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Delmadinone acetate is an orally active ACTH inhibitor that exerts its effects by suppressing adrenal function through the inhibition of adrenocorticotropic hormone release from the pituitary gland. This compound is primarily used in veterinary medicine for the control of estrus and ovulation in both female and male pets. Its ability to modulate endocrine functions makes it valuable for research focused on reproductive biology and hormonal regulation.
Melanoxazal is an inhibitor of melanin biosynthesis. It effectively reduces melanin formation in silkworm larva hemolymph, with an IC50 of 30.1 μg/mL, and demonstrates a potent inhibitory effect on mushroom tyrosinase, exhibiting an IC50 of 4.2 μg/mL. This compound is primarily utilized in research exploring pigmentation processes and the role of melanin in various biological systems.
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Velutin is a melanin biosynthesis inhibitor derived from Flammulina velutipes. It effectively reduces osteoclast differentiation and modulates hypoxia-inducible factor 1-alpha (HIF-1α) expression via the NF-kB signaling pathway. This compound is valuable for research focusing on pigmentation processes and bone metabolism.
D-Tyrosine is a melanogenesis inhibitor that specifically targets tyrosinase activity. By negatively regulating melanin synthesis, D-Tyrosine effectively reduces pigmentation in various biological systems. Additionally, it demonstrates the ability to inhibit biofilm formation and induce the self-dispersal of biofilms, maintaining bacterial viability. This compound is valuable for research applications focused on pigmentation disorders and biofilm-related studies.
Chlorogenic acid butyl ester functions primarily as a melanogenesis inhibitor, targeting critical components in melanin production. It effectively suppresses the expression of microphtalmia-associated transcription factor (MITF), as well as key enzymes involved in melanogenesis, including tyrosinase and tyrosinase-related proteins 1 and 2 (TRP-1 and TRP-2). Additionally, chlorogenic acid butyl ester exhibits antioxidant properties, making it valuable for research in skin pigmentation and oxidative stress studies.
