Abstract:
:The mechanism of selective incorporation of thiourea into melanotic melanoma was investigated by model experiments in which the effect of the compound was examined at various stages of melanogenesis in vitro. Up to 50% inhibition of dopachrome formation was observed in the tyrosinase-dopa reaction in the presence of thiourea at a 2:1 molar ratio with respect to the substrate. Under these conditions, a major product was formed which was isolated and identified as a 1:1 dopa-thiourea adduct (adduct I). Subsequent stages of the oxidation were characterized by the development of a yellow chromophore (lambdamax 440-460nm), virtually identical to that obtained by separate oxidation of the adduct I. A less remarkable effect of thiourea was observed on the oxidative polymerization of 5,6-dihydroxyindole (DHI) and 5,6-dihydroxyindole-2-carboxylic acid (DHICA) which was apparent on spectrophotometric and high pressure liquid chromatography (HPLC) analysis. Radiolabelling experiments with 14C-thiourea showed that the label was initially incorporated into the adduct I, while in the subsequent stages of the oxidation it was associated with pigmented materials which escaped direct analysis. Incorporation of labelled thiourea into dopa-melanins was found to be significantly higher than incorporation into synthetic pigments from indole precursors. These results provide a chemical basis for the interpretation of the selective accumulation of thiourea in those melanoma areas with high rates of melanin synthesis seen in autoradiographic experiments.
journal_name
Melanoma Resjournal_title
Melanoma researchauthors
Palumbo A,Mårs U,De Martino L,d'Ischia M,Napolitano A,Larsson BS,Prota Gdoi
10.1097/00008390-199712000-00006subject
Has Abstractpub_date
1997-12-01 00:00:00pages
478-85issue
6eissn
0960-8931issn
1473-5636journal_volume
7pub_type
杂志文章abstract::Between 1983 and 1992, 21 patients with extremity stage IIIA or IIIAB melanoma underwent hyperthermic isolation limb perfusion (HILP) with cisplatin in dosages varying from 26 to 237 mg/m2 as part of a pharmacokinetics and maximum-tolerated dose study. Extremity temperatures were up to 40 degrees C and the pH was cont...
journal_title:Melanoma research
pub_type: 临床试验,杂志文章
doi:
更新日期:1994-03-01 00:00:00
abstract::The presence or absence of melanoma cells in human peripheral blood has recently been shown to be associated with disease prognosis, including overall survival. The detection of tyrosinase mRNA-positive circulating melanoma cells by reverse transcription-polymerase chain reaction (RT-PCR) has been limited to dissemina...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/00008390-200008000-00007
更新日期:2000-08-01 00:00:00
abstract::Seasonal variation in melanoma diagnoses has been observed in numerous studies that used calendar time indicators. Depending on the latitude (and altitude) of the study region, the magnitude of seasonal and year-to-year variation of ultraviolet radiation (UVR) is neglected in these studies. An alternative approach com...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0000000000000205
更新日期:2015-12-01 00:00:00
abstract::Conjunctival melanoma is a rare disease, and little is known about its molecular background. Here, we present the case of a 48-year-old patient with conjunctival melanoma and metachronic lymph node and skin metastasis with KRAS p.K117Y mutation in exon 4 in all the lesions. The cancer genome interpreter predicted this...
journal_title:Melanoma research
pub_type: 杂志文章,评审
doi:10.1097/CMR.0000000000000423
更新日期:2018-04-01 00:00:00
abstract::Selective inhibition of the mutant BRAF protein is a highly promising therapeutic approach for melanoma patients carrying the BRAF mutation. Despite the remarkable clinical response, most patients develop resistance and experience tumour regrowth. To clarify the molecular background of BRAF inhibitor resistance, we ge...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0000000000000588
更新日期:2019-08-01 00:00:00
abstract::Several comparative genomic hybridization studies provide evidence for overrepresentation of the long arm of chromosome 20 in malignant melanoma. These studies also suggest that chromosome 20q contains genes that may contribute to melanoma pathogenesis. To refine the region of 20q amplification and to identify potenti...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0b013e3280141617
更新日期:2007-02-01 00:00:00
abstract::To study the mechanisms by which insulin regulates proliferation, we have compared wild-type Cloudman melanoma cells, whose growth in inhibited by insulin (insinh) to variant lines that were genetically selected for resistance to insulin (insres). Scatchard analysis of insulin binding to five insres) lines and six ins...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/00008390-199207000-00006
更新日期:1992-07-01 00:00:00
abstract::Preoperative assessment of melanoma invasion by sonometry has been reported to exhibit a high correlation with postoperative histometry based on the determination of a regression coefficient. We believe that this approach is not adequate and that it can be misleading. We therefore applied an appropriate statistical ap...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/00008390-199610000-00007
更新日期:1996-10-01 00:00:00
abstract::Patients with brain metastases (BM) from melanoma have an overall survival (OS) of 2-6 months after whole-brain radiotherapy. Targeted therapy (TT) is an effective treatment for BRAF-mutated metastatic melanoma. Moreover, recent studies indicate intracranial responses of TT in patients with BM. We analyzed 146 patient...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0000000000000429
更新日期:2018-04-01 00:00:00
abstract::Ginsenoside Rg3 is an effective chemical component extracted from the red Panix. The experiment demonstrated that it might effectively inhibit proliferation and metastasis of tumor cells. The exact molecular mechanism of Rg3 remains unclear so far. To further explore the antitumor function of Rg3, we investigated the ...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0b013e32830b3536
更新日期:2008-10-01 00:00:00
abstract::The management of metastatic melanoma is a difficult matter. Nevertheless, the advent of target therapy has significantly improved patient outcome, provided that tumor molecular characteristics become available: the detection of drug-resistant clones can contribute to understanding the reasons for resistance onset, in...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0000000000000510
更新日期:2019-02-01 00:00:00
abstract::There is no general consensus regarding the optimal follow-up strategy for patients with melanoma. We sought to determine the utility and cost effectiveness of radiological restaging of patients with stage IIB-IIIC melanoma at the 3-year follow-up time point. A retrospective review of 210 patients diagnosed with stage...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0b013e3283471086
更新日期:2011-08-01 00:00:00
abstract::The incidence of melanoma has increased continuously during the last decade. Surgery is the mainstay of therapy but, for patients with thick lesions or regional metastatic lymph nodes, there is a high risk of relapse. For this group of patients, there is no standard therapy or general agreement amongst oncologists. In...
journal_title:Melanoma research
pub_type: 杂志文章,评审
doi:10.1097/00008390-200510000-00001
更新日期:2005-10-01 00:00:00
abstract::In a previous large randomized, open-label study, retrospective subset analysis revealed that the addition of the Bcl-2 antisense oligonucleotide oblimersen to dacarbazine (Dac) significantly improved overall survival, progression-free survival, and the response rate in chemotherapy-naive patients with advanced melano...
journal_title:Melanoma research
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1097/CMR.0000000000000056
更新日期:2014-06-01 00:00:00
abstract::The objective of this study was to identify novel tumor-suppressor genes in melanoma, using an integrative genomic approach. Data from: (i) earlier reports of DNA loss and gain in malignant melanoma accompanied by comparative genomic hybridization high-definition array data of the entire human genome; (ii) microarray ...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0b013e328344a003
更新日期:2011-08-01 00:00:00
abstract::Uveal melanoma is a rare form of melanoma and the most frequent primary eye malignancy in adults. The major molecular alterations underlying uveal melanoma pathogenesis affect mainly the GNAQ, GNA11, SF3B1, and BAP1 genes. In this study, we somatically genotyped 31 Brazilian uveal melanomas for BRAF, GNA11, GNAQ, SF3B...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0000000000000523
更新日期:2019-06-01 00:00:00
abstract::Glutathione (GSH) is the major non-protein thiol in cells that plays a critical role against damage from electrophilic agents such as alkylating drugs. Selective therapeutic GSH elevation in normal but not in tumour cells has been suggested as a means of protecting host tissues against more intense doses of chemothera...
journal_title:Melanoma research
pub_type: 杂志文章
doi:
更新日期:2000-04-01 00:00:00
abstract::There is a scarcity of available data on unmet information needs (UINs) of melanoma patients (MPs) from Germany and of MPs with clinical stage IV. In a multicenter cross-sectional survey, we explored the UINs of 529 MPs by applying a standardized questionnaire. Subgroup differences in scope and contents of UINs were d...
journal_title:Melanoma research
pub_type: 杂志文章,多中心研究
doi:10.1097/CMR.0000000000000464
更新日期:2019-04-01 00:00:00
abstract::Loss of expression of E-cadherin, the major cell-cell adhesion receptor on keratinocytes, has been linked to tumour progression in various carcinomas. As E-cadherin has been reported to be expressed in cultured human melanocytes, we questioned whether loss of E-cadherin expression may also be related to melanocytic tu...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/00008390-199604000-00007
更新日期:1996-04-01 00:00:00
abstract::For primary melanoma, there is a delay between the initial skin biopsy and sentinel lymph node dissection, which may cause anxiety for the patient. The consequences of this delay on disease progression are unknown. The goal of this study was to determine whether delay time for sentinel node dissection from the initial...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0b013e32835861f6
更新日期:2012-10-01 00:00:00
abstract::Recreational exposure to the sun may not explain fully current trends in melanoma incidence. The hypothesis was examined whether carcinogens in water play a role in the development of cutaneous melanoma. In a case-control study, 128 melanoma patients and 168 patients with other types of malignancy completed a detailed...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/00008390-199410000-00002
更新日期:1994-10-01 00:00:00
abstract::Protein tyrosyl phosphorylation is an essential component in intracellular signalling, with diverse and crucial functions including mediation of cell proliferation, survival, death, differentiation, migration and attachment. It is regulated by the balance between the activities of protein tyrosine kinases (PTKs) and p...
journal_title:Melanoma research
pub_type: 杂志文章,评审
doi:10.1097/00008390-200010000-00001
更新日期:2000-10-01 00:00:00
abstract::We studied the efficacy, tolerability and clinical courses of dabrafenib in patients with metastatic melanoma who were ineligible for enrolment into a clinical trial. Between July 2011 and May 2013, patients with unresectable stage III or stage IV, V600-mutated metastatic melanoma who were not eligible for inclusion i...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0000000000000036
更新日期:2014-04-01 00:00:00
abstract::Ophthalmological complications constitute a class effect of treatment with BRAF inhibitors. Encorafenib is a new BRAF inhibitor currently being tested in phase 3 clinical trials for advanced or metastatic melanoma as monotherapy or in combination with the MEK-inhibitor binimetinib. In this study, we present a case of ...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0000000000000505
更新日期:2018-12-01 00:00:00
abstract::A large body of evidence in the scientific literature suggests that the numbers of common and atypical nevi are strong, independent risk factors for the occurrence of cutaneous malignant melanoma. Furthermore, some studies recently found an association between high nevus counts and an improved melanoma prognosis. The ...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0000000000000579
更新日期:2020-04-01 00:00:00
abstract::Patients with melanoma may experience a variety of different vision symptoms, in part associated with melanoma-associated retinopathy. For several melanoma patients with or without melanoma-associated retinopathy, colour vision deficiencies, especially involving the tritan system, have been reported. The frequency of ...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/01.cmr.0000222599.35062.84
更新日期:2006-10-01 00:00:00
abstract::We studied the levels of serum copper and zinc as possible diagnostic factors or markers for the early detection of patients with melanoma. Levels were determined in 35 melanoma patients at various clinical stages and in 39 healthy persons. Measurements were performed by atomic absorption spectroscopy using 5100-PC-Pe...
journal_title:Melanoma research
pub_type: 杂志文章
doi:
更新日期:1998-06-01 00:00:00
abstract::Superantigens like the Staphylococcus enterotoxin A (SEA) can direct cytotoxic T lymphocytes expressing certain T cell receptor V beta regions to lyse MHC class II-positive target cells. This superantigen-dependent cellular cytotoxicity (SDCC) has been extended to MHC class II-negative tumour cells by targeting T cell...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/00008390-199706000-00005
更新日期:1997-06-01 00:00:00
abstract::Germline mutations determining increased cutaneous malignant melanoma (CMM) risk have been identified in familial and sporadic CMM cases, but they account only for a small proportion of CMM cases. Recent evidence suggests that germline epimutations (e.g. DNA methylation alterations), which can be inherited similarly t...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0000000000000112
更新日期:2014-10-01 00:00:00
abstract::Metabolic imaging with F-18 fluorodeoxy-D-glucose positron emission tomography is one of the most sensitive and non-invasive techniques, and has proved useful in melanoma. We designed, in 2004, at the Institute Gustave Roussy, a prospective study to determine the value of F-18 fluorodeoxy-D-glucose positron emission t...
journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/CMR.0b013e32815c10b0
更新日期:2007-06-01 00:00:00