melanosis/tyrosine

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Use of tyrosine hydroxylase RNAi to study Megoura viciae (Hemiptera: Aphididae) sequestration of its host's l-DOPA for body melanism.

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Přihlášení Registrace

Melanism in insects is important for their physical protection, immunoreactions, and sclerotization. The vetch aphid, Megoura viciae (Buckton), has relatively strong tanning in its prothorax, head, antennae, cornicles, and legs. It was hypothesized that M. viciae may sequester the high level of

Elevenin signaling modulates body color through the tyrosine-mediated cuticle melanism pathway.

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Elevenin is a newly discovered novel neuropeptide. Knockdown of either elevenin or orphan receptor NlA42 transcript expression by RNA interference caused severe cuticle melanization in the brown planthopper (BPH). Injection of a synthetic elevenin peptide not only rescued the body color phenotype in

Oral melanosis after tyrosine kinase inhibition with Imatinib for chronic myelogenous leukemia: report of a case and review of the literature.

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Dermatologic manifestations from therapy with imatinib are well known and frequently include hypopigmentation, and less commonly, hyperpigmentation. There have been few reports of oral hyperpigmentation. We present a case of palatal melanosis related to imatinib therapy for chronic myelogenous

[Ultraviolet irradiation-mediated malignant melanoma induction with RET tyrosine kinase activation].

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We previously established a RET-transgenic mouse line (304/B6), in which skin melanosis, benign melanocytic tumors and malignant melanoma spontaneously develop. We found that the activities of RET tyrosine kinase, Erk and c-Jun are definitely upregulated in malignant melanoma in the RET-transgenic

l-tyrosine induces melanocyte differentiation in novel pink-eyed dilution castaneus mouse mutant showing age-related pigmentation.

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BACKGROUND The mouse pink-eyed dilution (oculocutaneous albinism II; p/Oca2(p)) locus is known to control tyrosinase activity, melanin content, and melanosome development in melanocytes. Pink-eyed dilution castaneus (p(cas)/Oca2(p-cas)) is a novel mutant allele on mouse chromosome 7 that arose

Lack of evidence for OSMR and RET gene mutations in a Chinese family with friction melanosis.

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BACKGROUND Friction melanosis (FM) is a common dermatological disorder. Although cases have been reported, familial FM is rare. FM and macular amyloidosis (MA) have been hypothesized to be identical clinical conditions, and cutaneous lichen amyloidosis (CLA) is linked to mutations in the OSMR

Industrial melanism in the peppered moth is not associated with genetic variation in canonical melanisation gene candidates.

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Industrial melanism in the peppered moth (Biston betularia) is an iconic case study of ecological genetics but the molecular identity of the gene determining the difference between the typical and melanic (carbonaria) morphs is entirely unknown. We applied the candidate gene approach to look for

Imatinib induced melasma-like pigmentation: Report of five cases and review of literature.

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Imatinib mesylate is a cytotoxic agent that targets tyrosine kinase. Common side effects of this drug include nausea, edema and maculopapular rash. Hypopigmentation is a commonly reported side effect of this drug while hyperpigmentation has rarely been described. We describe five cases of

Overexpression of Tyrosine hydroxylase and Dopa decarboxylase associated with pupal melanization in Spodoptera exigua.

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Melanism has been found in a wide range of species, but the molecular mechanisms involved remain largely elusive. In this study, we studied the molecular mechanisms of the pupal melanism in Spodoptera exigua. The full length cDNA sequences of tyrosine hydroxylase (TH) and dopa decarboxylase (DDC),

A Rare Case of Melanosis of the Hard Palate Mucosa in a Patient with Chronic Myeloid Leukemia.

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Imatinib Mesylate, also known as Gleevec or ST1-571, is a tyrosine-kinase inhibitor used as the gold standard medication for the chronic myeloid leukemia (CML); Imatinib has indeed deeply revolutionized the CML therapy allowing most patients to have a good quality of life. Despite its beneficial

Mucosal pigmentation caused by imatinib: report of three cases.

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Přihlášení Registrace

Imatinib mesylate (STI-571, Gleevec(®)), a tyrosine kinase inhibitor, is a first-line medication for treating chronic myeloid leukemia (CML). Clinical studies revealed very good hematological responses without significant side effects. However, imatinib may lead to mucosal pigmentation. Three

The Anti-melanogenesis Activities of Some Selected Red Macroalgae from Northern Coasts of the Persian Gulf.

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Tyrosinase is a key enzyme in melanin production. Therefore, tyrosinase inhibitors are used in cosmetic and medicinal industries to prevent or treat overproduction of melanin such as melasma, solar lentigo and post inflammatory melanoderma. Due to safety of natural whitening agents, in the present

Quantification of Hypopigmentation Activity In Vitro.

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This study presents laboratory methods for the quantification of hypopigmentation activity in vitro. Melanin, the major pigment in melanocytes, is synthesized in response to multiple cellular and environmental factors. Melanin protects skin cells from ultraviolet damage, but also has biophysical and

Simultaneous analysis of tyrosinase mRNA and markers of tyrosinase activity in the blood of patients with metastatic melanoma.

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Determination of blood tyrosinase mRNA by RT-PCR and markers of tyrosinase activity (L-DOPA/L-tyrosine ratio) by HPLC have been proposed as biological tools for the detection of metastases in melanoma patients. We prospectively evaluated their significance and clinical value in a group of 30 stage

Proliferation and neoplastic transformation of pigment cells in metallothionein/ret transgenic mice.

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Although melanoma is a common human disease, there were few animal models in which melanoma developed at high incidence. To date, the Xiphophorus fish has been used as a model system to study melanoma formation. Studies on this fish showed the presence of a dominant oncogene, Tu, which encodes a

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