keratinocytes

Hypericin (Cyclosan) is a natural anthraquinone compound, an extract of Hypericum perforatum, which inhibits PKC, MAO, dopamine-beta-hydroxylase, reverse transcriptase, telomerase, and CYP, etc. Hypericin exhibits antimicrobial, antiviral, antitumor, and antidepressant activities.

Jagged-1 (188-204) TFA(219127-21-6 free base) is a fragment of the JAG-1 protein. JAG-1 is Notch ligand, a peptide that is the most conspicuously expressed ligand in skin. JAG-1 induces epidermal maturation. Exposing submerged keratinocytes monolayers to JAG-1 with elevated calcium concentration produces stratification with loricrin expression and NF-alphaB activation.

Hinokitiol (4-Isopropyltropolone) can inhibit ultraviolet B-induced apoptosis in keratinocytes and strongly suggest that the inhibitory mechanism is due to the antioxidant activity of metallothionein induced by the agent. Also, Hinokitiol modulates estrogen receptor signaling and inhibits proliferation of human breast cancer cells.

12R-LOX-IN-2 is an inhibitor of 12R-lipoxygenase (12R-LOX).12R-LOX-IN-2 inhibits imiquimod (IMQ)-induced hyperproliferation of psoriatic keratinocytes and inhibits colony formation.12R-LOX-IN-2 also decreases the protein level of Ki67 and the mRNA expression of IL-17A in IMQ-induced cells. 12R-LOX-IN-2 may be useful in the study of psoriasis and other skin-associated inflammatory diseases.

(Z)-Ligustilide (Ligustilide A) , an active ingredient isolated from the medicinal plants Angelica acutiloba and Cnidium officinale, inhibits benzo(a)pyrene-induced CYP1A1 upregulation in cultured human keratinocytes via ROS-dependent Nrf2 activation.

GNF351 is a full antagonist of the aryl hydrocarbon receptor (AHR)with the capacity to inhibit both DRE-dependent and -independent activity. GNF351 is minimal toxicity in mouse or human keratinocytes. GNF351 competes with a photoaffinity AHR ligand for binding to the AHR (IC50: 62 nM).

MiADMSA (Monoisoamyl DMSA) is a lipophilic chelating agent that has shown potential as a chelator/detoxifier for arsenic and several heavy metals, including lead, mercury, cadmium, and gallium arsenide. It mitigates oxidative stress induced by sodium tungstate and improves liver and immune system alterations caused by chronic copper poisoning in Sprague Dawley rats. Additionally, MiADMSA protects human keratinocytes ['HaCaT'] from arsenic-induced oxidative stress.

Itaconic acid prodrug-1 (Compound P2) is an orally active prodrug of Itaconic acid that efficiently delivers Itaconic acid to skin tissues upon oral administration. It exhibits immunomodulatory effects, significantly inhibiting Poly(I:C)/IFNγ-induced inflammatory cytokines in human epidermal keratinocytes. Itaconic acid prodrug-1 is useful for research into alopecia areata and other inflammatory skin conditions.

Antioxidant agent-20 (Compound 3d) exhibits potent anti-inflammatory and antioxidant activities. It reduces reactive oxygen species (ROS) and apoptosis in a dose-dependent manner. Antioxidant agent-20 demonstrates photoprotective effects on UVB-exposed human skin keratinocytes (HaCaT) (IC50=5.13 µM) by activating Nrf2/HO-1 signaling and inhibiting the NF-κB pathway.

2-Ethylhexyl (E)-3-(4-(methoxy-d3)phenyl)acrylate is the deuterated form of Octinoxate. Octinoxate (Octyl methoxycinnamate) acts as an agonist of thyroid hormone receptors, leading to a reduction in triiodothyronine (T3) and thyroxine (T4) levels, as well as the transcription levels of type II deiodinase (deio2) related genes in Japanese Medaka. Commonly used as a safe ultraviolet (UV) filter in aquatic environments, Octinoxate inhibits CYP1A1 and CYP1B1, and influences hyaluronic acid (HA) metabolism in human keratinocytes through a PI3K pathway-dependent manner. It also exhibits both anti-estrogenic and anti-androgenic effects in vitro and in vivo.

Glycerophosphoinositol lysine has an anti-dandruff, anti-inflammatory, anti-aging activity. It significantly suppresses UVB - induced PGE secretion in NHEK keratinocytes.

CX-659S is a novel diaminuracil derivative that indirectly inhibits Langerhans cell function by blocking the MEK1/2 -- ERK1/2 pathway in keratinocytes. CX-659S can inhibit the contact hypersensitivity induced by haptens in mice.

α-Melanocyte-stimulating hormone (α-MSH) is a 13-amino acid peptide hormone produced by post-translational processing of proopiomelanocortin (POMC) in the pituitary gland, as well as in keratinocytes, astrocytes, monocytes, and gastrointestinal cells.1It is an agonist of melanocortin receptor 3 (MC3R) and MC4R that induces cAMP production in Hepa cells expressing the human receptors (EC50s = 0.16 and 56 nM, respectively).2α-MSH (100 pM) reducesS. aureuscolony formation andC. albicansgerm tube formationin vitro.3It inhibits endotoxin-, ceramide-, TNF-α-, or okadaic acid-induced activation of NF-κB in U937 cells.1α-MSH reduces IL-6- or TNF-α-induced ear edema in mice.4It also prevents the development of adjuvant-induced arthritis in rats and increases survival in a mouse model of septic shock. Increased plasma levels of α-MSH are positively correlated with delayed disease progression and reduced death in patients with HIV.1 1.Catania, A., Airaghi, L., Colombo, G., et al.α-melanocyte-stimulating hormone in normal human physiology and disease statesTrends Endocrinol. Metab.11(8)304-308(2000) 2.Miwa, H., Gantz, I., Konda, Y., et al.Structural determinants of the melanocortin peptides required for activation of melanocortin-3 and melanocortin-4 receptorsJ. Pharmacol. Exp. Ther.273(1)367-372(1995) 3.Cutuli, M., Cristiani, S., Lipton, J.M., et al.Antimicrobial effects of a-MSH peptidesJ. Leukoc. Biol.67(2)233-239(2000) 4.Lipton, J.M., Ceriani, G., Macaluso, A., et al.Antiiinflammatory effect of the neuropeptide a-MSH in acute, chronic, and systemic inflammationAnn. N.Y. Acad. Sci.25(741)137-148(1994)

β-Defensin-2 is a peptide with antimicrobial properties that protects the skin and mucosal membranes of the respiratory, genitourinary, and gastrointestinal tracts.1It inhibits the growth of periodontopathogenic and cariogenic bacteria, includingP. gingivalisandS. salivarius.2β-Defensin-2 (30 μg/ml) stimulates gene expression and production of IL-6, IL-10, CXCL10, CCL2, MIP-3α, and RANTES by keratinocytes.3It also stimulates calcium mobilization, migration, and proliferation of keratinocytes when used at concentrations of 30, 10, and 40 μg/ml, respectively. β-Defensin-2 induces IL-31 production by human peripheral blood-derived mast cellsin vitrowhen used at a concentration of 10 μg/ml and by rat mast cellsin vivofollowing a 500 ng intradermal dose.4Expression of β-defensin-2 is increased in psoriatic skin and chronic wounds.5,6 1.Lehrer, R.I.Primate defensinsNat. Rev. Microbiol.2(9)727-738(2004) 2.Ouhara, K., Komatsuzawa, H., Yamada, S., et al.Susceptibilities of periodontopathogenic and cariogenic bacteria to antibacterial peptides, β-defensins and LL37, produced by human epithelial cellsJ. Antimicrob. Chemother.55(6)888-896(2005) 3.Niyonsaba, F., Ushio, H., Nakano, N., et al.Antimicrobial peptides human β-defensins stimulate epidermal keratinocyte migration, proliferation and production of proinflammatory cytokines and chemokinesJ. Invest. Dermatol.127(3)594-604(2007) 4.Niyonsaba, F., Ushio, H., Hara, M., et al.Antimicrobial peptides human β-defensins and cathelicidin LL-37 induce the secretion of a pruritogenic cytokine IL-31 by human mast cellsJ. Immunol.184(7)3526-3534(2010) 5.Huh, W.-K., Oono, T., Shirafuji, Y., et al.Dynamic alteration of human β-defensin 2 localization from cytoplasm to intercellular space in psoriatic skinJ. Mol. Med. (Berl.)80(10)678-684(2002) 6.Butmarc, J., Yufit, T., Carson, P., et al.Human β-defensin-2 expression is increased in chronic woundsWound Repair Regen.12(4)439-443(2004)

β-Defensin-3 is a peptide with antimicrobial properties that protects the skin and mucosal membranes of the respiratory, genitourinary, and gastrointestinal tracts. It inhibits the growth of the periodontopathogenic and cariogenic bacteria F. nucleatum, S. mutans, S. sobrinus, S. salivarius, and L. casei (MICs = 12.5-100 mg/l). It also inhibits the growth of S. aureus, S. pyogenes, P. aeruginosa, E. coli, and C. albicans. β-Defensin-3 stimulates gene expression and production of IL-6, IL-10, CXCL10, CCL2, MIP-3α, and RANTES by keratinocytes when used at a concentration of 30 μg/ml. It also stimulates calcium mobilization, migration, and proliferation of keratinocytes when used at concentrations of 30, 5, and 20 μg/ml, respectively. β-Defensin-3 induces IL-31 production by human peripheral blood-derived mast cells in vitro when used at a concentration of 10 μg/ml and by rat mast cells in vivo following a 500 ng intradermal dose.

β-Defensin-4 is a peptide with antimicrobial properties that protects the skin and mucosal membranes of the respiratory, genitourinary, and gastrointestinal tracts. It induces migration of monocytes in vitro when used at a concentration of 10 nM but does not affect migration of neutrophils and eosinophils. β-Defensin-4 (30 μg/ml) stimulates gene expression and production of IL-6, IL-10, CXCL10, CCL2, MIP-3α, and RANTES by keratinocytes. It also stimulates calcium mobilization, migration, and proliferation of keratinocytes when used at concentrations of 30, 10, and 40 μg/ml, respectively. β-Defensin-4 induces IL-31 production by human peripheral blood-derived mast cells in vitro when used at a concentration of 10 μg/ml and by rat mast cells in vivo following a 500 ng intradermal dose. It also inhibits growth of E. coli, P. aeruginosa, and S. aureus with lethal concentration (LC) values of 5, 12, and 15 μM, respectively, of S. carnosus (MIC = 4.5 μg/ml), and of C. albicans with a minimum fungicidal concentration (MFC) value of 7.5 μM.

Ganglioside GQ1b is a tetrasialoganglioside that contains two sialic acid residues linked to an inner galactose unit. It stimulates phosphorylation of several ecto-type protein kinase substrates on the surface of GOTO human neuroblastoma cells when used at a concentration of 5 nM. Ganglioside GQ1b promotes differentiation of murine embryonic stem cells (mESCs) to neuronal precursor and glial cells via activation of the ERK1/2 pathway. It also induces differentiation of murine keratinocytes through phosphoinositide turnover. Ganglioside GQ1b mixture contains ganglioside GQ1b molecular species with C18:1 and C20:1 sphingoid backbones.

1-O-Hexadecyl-sn-glycerol is a biologically active alkyl glyceryl ether that exhibits protective effects against UVB-induced cellular damage by reducing keratinocyte death, reactive oxygen species (ROS) generation, and prostaglandin E2 synthesis in normal human epidermal keratinocytes (NHEKs). additionally, at a concentration of 50 μM, 1-O-Hexadecyl-sn-glycerol significantly enhances coronary flow and left ventricular developed pressure while reducing malondialdehyde (MDA) formation in an ex vivo rat heart model of ischemia and reperfusion injury, thereby demonstrating both cytoprotective and cardioprotective properties.

Halometasone is a synthetic corticosteroid.1,2Formulations containing halometasone have been used in the treatment of psoriasis vulgaris and eczematous dermatoses. 1.de la Brassine, M., Kint, A., Lachapelle, J.M., et al.Halomethasone (C 48.401-Ba) for the topical treatment of common dermatosesJ. Int. Med. Res.12(5)307-309(1984) 2.Zhu, J.-W., Wu, X.-J., Lu, Z.-F., et al.Role of VEGF receptors in normal and psoriatic human keratinocytes: Evidence from irradiation with different UV sourcesPLoS One8(1)e55463(2013)

C2 Phytoceramide is a bioactive semisynthetic sphingolipid that inhibits formyl peptide-induced oxidant release (IC50 = 0.38 μM) in suspended polymorphonuclear cells. It increases COX-2 protein levels 15-fold through ERK signaling. It induces death of keratinocytes (20% viability) with an ED50 value of 30 μM, the same concentration at which 35% of cells in a TUNEL assay are apoptotic. C2 Phytoceramide also has antiproliferative effects in CHO cells, with greater than 80% cytotoxicity achieved at a concentration of 20 μM, and induces internucleosomal DNA fragmentation. In addition, it inhibits the activation of phospholipase D (PLD) mediated by muscarinic acetylcholine receptors in vitro.

Lumisterol (9β,10α-Ergosterol), the (9β,10α)-stereoisomer of Ergosterol, is a steroid compound that acts as a photoprotective agent against UVB-induced DNA damage and demonstrates anti-proliferative activities[1].

Lumisterol 3 (9β,10α-Cholesta-5,7-dien-3β-ol) is a sterol metabolite and a photosensitised isomer derivative of vitamin D3. It activates Nrf2 and p53 and protects keratinocytes from UVB-induced damage.

4-Methyl-1-pentanol exhibits inhibitory activity against SCC-25 cells and NHK cells (normal human keratinocytes), making it useful for cancer research.

(+)-Columbianetin ((S)-Columbianetin) is a new phytoalexin associated with celery (Apium graveolens) resistance to pathogens during storage, it also has antifungal activity. (+)-Columbianetin has anti-inflammatory effects, it promotes histamine release, and inhibits the histamine release by substance P, suggests that it may be helpful in regulating mast cell-mediated allergic inflammatory responses. (+)-Columbianetin can be effectively used to protect keratinocytes from UVB induced damage.