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14 резултати
Novel Intrapolymerization Doped Manganese-Eumelanin Coordination Nanocomposites with Ultrahigh Relaxivity and Their Application in Tumor Theranostics.
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While magnetic resonance imaging contrast agents have potential in noninvasive image-guided tumor treatment, further developments are needed to increase contrast, biodegradability, and safety. Here, novel engineered manganese-eumelanin coordination nanocomposites (MnEMNPs) are developed via a facile
MC1R, eumelanin and pheomelanin: their role in determining the susceptibility to skin cancer.
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Skin pigmentation is due to the accumulation of two types of melanin granules in the keratinocytes. Besides being the most potent blocker of ultraviolet radiation, the role of melanin in photoprotection is complex. This is because one type of melanin called eumelanin is UV absorbent, whereas the
Agonist-independent, high constitutive activity of the human melanocortin 1 receptor.
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The melanocortins (alpha-melanocyte-stimulating hormone and adrenocorticotropin) act on epidermal melanocytes to increase melanogenesis, the eumelanin/pheomelanin ratio and dendricity. These actions are mediated by the heptahelical melanocortin 1 receptor (MC1R), positively coupled to adenylyl
Soluble melanins of the Randia echinocarpa fruit - Structural characteristics and toxicity.
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The water-soluble melanins (SM) of Randia echinocarpa fruit possess interesting biological activities and have been scarcely characterized. In this study, SM were obtained at boiling (SMBT) and room (SMRT) temperatures and characterized by UV-Vis, IR, thermogravimetric analysis, and GC-MS of the
Production of brown/yellow patches in the SLC7A11 transgenic sheep via testicular injection of transgene.
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The gene, SLC7A11, which encodes the solute carrier family 7 member 11 (anionic amino acid transporter light chain, xCT), has been reported to be implicated in multiple processes such as in pheomelanin production, cell proliferation and migration, Kaposi's sarcoma herpesvirus (KSHV) entry into the
Induced melanin reduces mutations and cell killing in mouse melanoma.
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When melanin absorbs light energy, it can produce potentially damaging active oxygen species. There is little doubt that constitutive pigment in dark-skinned individuals is photoprotective against skin cancer, but induced pigment-as in tanning-may not be. The first step in cancer induction is
Dual role of melanins and melanin precursors as photoprotective and phototoxic agents: inhibition of ultraviolet radiation-induced lipid peroxidation.
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Ultraviolet radiation (UVR) is one of the risk factors for skin cancer and the main inducer of melanin pigmentation, the major protective mechanism of mammalian skin against radiation damage. The melanin pigments, eumelanin and pheomelanin, are likely to be important in protection against UVR, but
Pharmacologic induction of epidermal melanin and protection against sunburn in a humanized mouse model.
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Fairness of skin, UV sensitivity and skin cancer risk all correlate with the physiologic function of the melanocortin 1 receptor, a Gs-coupled signaling protein found on the surface of melanocytes. Mc1r stimulates adenylyl cyclase and cAMP production which, in turn, up-regulates melanocytic
Aging in epidermal melanocytes: cell cycle genes and melanins.
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With aging, melanocytes become unevenly distributed in the epidermis. In light skin individuals, hypopigmentation is found in association with focal hyperpigmentation (lentigo senilis). Apparently this results from progressive loss of active melanocytes and focal increase in melanocyte proliferation
MC1R and the response of melanocytes to ultraviolet radiation.
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The constitutive color of our skin plays a dramatic role in our photoprotection from solar ultraviolet radiation (UVR) that reaches the Earth and in minimizing DNA damage that gives rise to skin cancer. More than 120 genes have been identified and shown to regulate pigmentation, one of the key genes
Minireview: Peptide analogs and short sequence oligopeptides as modulators of skin pigmentation.
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Short sequence amino acids or oligopeptides have recently garnered attention for use as treatments for a myriad of dermatologic disorders due to their ability to effect and modulate various biological processes in the epidermis and dermis, rendering them promising candidates as medical and
Melanoma prevention strategy based on using tetrapeptide alpha-MSH analogs that protect human melanocytes from UV-induced DNA damage and cytotoxicity.
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Melanoma is the deadliest form of skin cancer, with no cure for advanced disease. We propose a strategy for melanoma prevention based on using analogs of alpha-melanocyte stimulating hormone (alpha-MSH) that function as melanocortin 1 receptor (MC1R) agonists. Treatment of human melanocytes with
Silver-nanoparticles as plasmon-resonant enhancers for eumelanin's photoacoustic signal in a self-structured hybrid nanoprobe.
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Developing safe and high efficiency contrast tools is an urgent need to allow in vivo applications of photoacoustics (PA), an emerging biomolecular imaging methodology, with poor invasiveness, deep penetration, high spatial resolution and excellent endogenous contrast. Eumelanins hold huge promise
An ultraviolet-radiation-independent pathway to melanoma carcinogenesis in the red hair/fair skin background.
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People with pale skin, red hair, freckles and an inability to tan--the 'red hair/fair skin' phenotype--are at highest risk of developing melanoma, compared to all other pigmentation types. Genetically, this phenotype is frequently the product of inactivating polymorphisms in the melanocortin 1
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