MyMedR

Displaying publications 21 - 40 of 79 in total

Abstract:

Sort:

Fulltext Melanogenic Inhibition and Toxicity Assessment of Flavokawain A and B on B16/F10 Melanoma Cells and Zebrafish (Danio rerio)

Mohd Sakeh N, Md Razip NN, Mohd Ma'in FI, Abdul Bahari MN, Latif N, Akhtar MN, et al.

Molecules, 2020 Jul 28;25(15).
PMID: 32731323 DOI: 10.3390/molecules25153403

Excessive production of melanin implicates hyperpigmentation disorders. Flavokawain A (FLA) and flavokawain B (FLB) have been reported with anti-melanogenic activity, but their melanogenic inhibition and toxicity effects on the vertebrate model of zebrafish are still unknown. In the present study, cytotoxic as well as melanogenic effects of FLA and FLB on cellular melanin content and tyrosinase activity were evaluated in α-MSH-induced B16/F10 cells. Master regulator of microphthalmia-associated transcription factor (Mitf) and the other downstream melanogenic-related genes were verified via quantitative real time PCR (qPCR). Toxicity assessment and melanogenesis inhibition on zebrafish model was further observed. FLA and FLB significantly reduced the specific cellular melanin content by 4.3-fold and 9.6-fold decrement, respectively in α-MSH-induced B16/F10 cells. Concomitantly, FLA significantly reduced the specific cellular tyrosinase activity by 7-fold whilst FLB by 9-fold. The decrement of melanin production and tyrosinase activity were correlated with the mRNA suppression of Mitf which in turn down-regulate Tyr, Trp-1 and Trp-2. FLA and FLB exhibited non-toxic effects on the zebrafish model at 25 and 6.25 µM, respectively. Further experiments on the zebrafish model demonstrated successful phenotype-based depigmenting activity of FLA and FLB under induced melanogenesis. To sum up, our findings provide an important first key step for both of the chalcone derivatives to be further studied and developed as potent depigmenting agents.

Matched MeSH terms: Melanoma, Experimental/drug therapy; Melanoma, Experimental/metabolism*; Melanoma, Experimental/pathology
Malignant melanoma of the ear canal presenting as wart

Rafiqahmed Vasiwala, Ismail Burud

International e-Journal of Science, Medicine & Education, 2016;10(1):47-48.
MyJurnal

Malignant melanoma is a rare malignancy of the external auditory canal. The vast majority of them occur in the areas of the body that are exposed to the sun. Early histological examination may possibly favor better prognosis. We report a case of a 38-year-old female who presented with a small mass in right ear canal, earache and minimum discharge since 4 months. Initially scraping was done in the ENT clinic. Subsequently she had a wide excision done by the end aural approach at a different hospital. A year later the patient presented with a swelling involving the ear canal which extended to the helix and supratemporal region with the histology report as malignant melanoma. A literature review of the disease, radiological findings, immunohistochemical features and treatment options are discussed.

Matched MeSH terms: Melanoma
Multidisciplinary Approach for Management of a Patient with Oral Mucosal Malignant Melanoma

Eachempati P, Aggarwal H, Shenoy VK, Baliga M

J Coll Physicians Surg Pak, 2018 Sep;28(9):S187-S189.
PMID: 30173693 DOI: 10.29271/jcpsp.2018.09.S187

Oral mucosal melanoma is rare and more aggressive than cutaneous melanoma. Hard palate and maxillary alveolar crest are most commonly involved. Multidisciplinary team approach is necessary for successful management of this tumor. The main treatment modality is surgical resection, which usually results in impaired mastication, deglutition, speech, oral competence and significant cosmetic deformity. Here, a rare case of oral mucosal melanoma of mandibular gingiva in a 44-year man is reported, who was treated by en-block mandibular resection followed by adjuvant therapy with high dose interferons (IFN) - 2b. Following two weeks of healing period, prosthetic rehabilitation of the patient was done with an interim removable denture prosthesis, which effectively limited the unfavourable effects of surgery and helped him in resocialisation.

Matched MeSH terms: Melanoma/drug therapy; Melanoma/pathology*; Melanoma/surgery
Malignant melanoma of the choroid in a naevus of Ota

Singh M, Kaur B, Annuar NM

Br J Ophthalmol, 1988 Feb;72(2):131-3.
PMID: 3349013

A rare case of choroidal malignant melanoma in a naevus of Ota is described. This is the first reported case from Asia outside the Japanese population. This case illustrates the need for close observation of all pigmented lesions of the eye.

Matched MeSH terms: Melanoma/diagnosis; Melanoma/pathology*; Melanoma/secondary
Primary malignant melanoma of the oesophagus

Gul YA, Prasannan S, Hairuszah I

Acta Chir. Belg., 2003 Aug;103(4):420-2.
PMID: 14524166

Primary malignant melanoma arising in the oesophagus is a rare condition with a dismal prognosis. The diagnosis is often made following surgical resection even though the endoscopic features may be pathognomonic. The classical treatment is oesophagectomy even though the advanced disease stage at the time of presentation and aggressive biological behaviour of the tumour usually results in a fatal outcome. We report the case of a male patient initially diagnosed with squamous oesophageal carcinoma and treated with conventional neo-adjuvant chemo-radiotherapy. Poor clinical and radiological response resulted in a review of the original histology confirming a diagnosis of primary malignant melanoma of the oesophagus. The subsequent alteration in management conferred the patient an improved quality of life. A short review of the literature on primary malignant melanoma of the oesophagus supplements this case report.

Matched MeSH terms: Melanoma/pathology*; Melanoma/therapy
Malignant melanomas in the Eur-African-Malay population of South Africa

Isaacson C, Spector I

Am J Dermatopathol, 1987 Apr;9(2):109-10.
PMID: 3504109

Malignant melanoma is common among the whites of South Africa. In the black population, the tumor is much less frequent and occurs predominantly on the lower limb--particularly the sole of the foot. This study brings to light the anomalous situation that among the Eur-African-Malay population (those of mixed ancestry), malignant melanoma has probably the lowest incidence in the world.

Matched MeSH terms: Melanoma/ethnology; Melanoma/epidemiology*
Anorectal melanoma

Jalleh RP, Pathmanathan R, Krishnan MM, Mukherjee A

Postgrad Med J, 1988 Sep;64(755):669-71.
PMID: 3251217

Four cases of anorectal melanoma are presented. The authors believe that this is the first report of the occurrence of this tumour in Malays. Advanced disease at initial presentation accounts for the poor prognosis observed in this series. Surgery remains the principal treatment modality, although controversy exists regarding optimal extent of resection.

Matched MeSH terms: Melanoma/ethnology*; Melanoma/pathology
Fulltext Germline variants are associated with increased primary melanoma tumor thickness at diagnosis

Mangantig E, MacGregor S, Iles MM, Scolyer RA, Cust AE, Hayward NK, et al.

Hum Mol Genet, 2021 01 06;29(21):3578-3587.
PMID: 33410475 DOI: 10.1093/hmg/ddaa222

Germline genetic variants have been identified, which predispose individuals and families to develop melanoma. Tumor thickness is the strongest predictor of outcome for clinically localized primary melanoma patients. We sought to determine whether there is a heritable genetic contribution to variation in tumor thickness. If confirmed, this will justify the search for specific genetic variants influencing tumor thickness. To address this, we estimated the proportion of variation in tumor thickness attributable to genome-wide genetic variation (variant-based heritability) using unrelated patients with measured primary cutaneous melanoma thickness. As a secondary analysis, we conducted a genome-wide association study (GWAS) of tumor thickness. The analyses utilized 10 604 individuals with primary cutaneous melanoma drawn from nine GWAS datasets from eight cohorts recruited from the general population, primary care and melanoma treatment centers. Following quality control and filtering to unrelated individuals with study phenotypes, 8125 patients were used in the primary analysis to test whether tumor thickness is heritable. An expanded set of 8505 individuals (47.6% female) were analyzed for the secondary GWAS meta-analysis. Analyses were adjusted for participant age, sex, cohort and ancestry. We found that 26.6% (SE 11.9%, P = 0.0128) of variation in tumor thickness is attributable to genome-wide genetic variation. While requiring replication, a chromosome 11 locus was associated (P melanoma growth and invasion.

Matched MeSH terms: Melanoma/diagnosis; Melanoma/pathology*
Fulltext Metastatic melanoma: a rare cause of central airway obstruction

Abdul Hamid MF, Ban Yu-Lin A, Hassan TM, Mohammad N

BMJ Case Rep, 2017 Nov 04;2017.
PMID: 29103009 DOI: 10.1136/bcr-2017-221545

A middle-aged woman with recurrent malignant melanoma presented initially with massive left pleural effusion. There was a complete obliteration of the left main bronchus on flexible bronchoscopy caused by a mass. Serial cryo-debulking of the tumour was done under rigid bronchoscopy; however, the outcome was not favourable due to the aggressive tumour growth. Vemurafenib was planned after thoracic radiation. She was not keen for the biologics treatment due to financial constraints. We report a case of central airway obstruction due to recurrent aggressive melanoma. More evaluations are needed on the role of interventional pulmonologist for bronchoscopic debulking of this rapidly growing tumour as well as the role of biological agents in treating such cases.

Matched MeSH terms: Melanoma/complications; Melanoma/diagnosis*; Melanoma/secondary; Melanoma/surgery
Cytotoxic mechanisms of panduratin A on A375 melanoma cells: A quantitative and temporal proteomics analysis

Lai SL, Wong PF, Lim TK, Lin Q, Mustafa MR

Proteomics, 2015 May;15(9):1608-21.
PMID: 25594392 DOI: 10.1002/pmic.201400039

Melanoma is a lethal form of skin cancer with rising global incidence. However, limited treatment options are available for advanced melanoma and this is further compounded by the development of resistance toward existing drugs. Panduratin A (PA), a cyclohexanyl chalcone found in Boesenbergia rotunda, was investigated for its cytotoxic potentials against human malignant melanoma A375 cells. Our initial findings revealed that mitochondrion is the primary acting site of PA on A375 cancer cells and the cytotoxic mechanisms of PA were further investigated using a temporal quantitative proteomics approach by iTRAQ 2D-LC-MS/MS. Comprehensive proteomics analysis identified 296 proteins that were significantly deregulated in PA-treated A375 cells and revealed the involvement of mitochondrial oxidative phosphorylation, secretory and ER stress pathway, and apoptosis. We further confirmed that the PA-induced apoptosis was mediated by prolonged ER stress at least in part via the PERK/eIF2α/ATF4/CHOP pathway. Pretreatment with cycloheximide, an ER stress inhibitor rescued PA-induced cell death, which was accompanied by the suppression of ER-stress-related HSPA5 and CHOP proteins. The present study provides comprehensive mechanistic insights into the cytotoxic mechanisms of PA.

Matched MeSH terms: Melanoma/drug therapy*; Melanoma/metabolism
Fulltext Phyllanthus spp. induces selective growth inhibition of PC-3 and MeWo human cancer cells through modulation of cell cycle and induction of apoptosis

Tang YQ, Jaganath IB, Sekaran SD

PLoS One, 2010;5(9):e12644.
PMID: 20838625 DOI: 10.1371/journal.pone.0012644

Phyllanthus is a traditional medicinal plant that has been used in the treatment of many diseases including hepatitis and diabetes. The main aim of the present work was to investigate the potential cytotoxic effects of aqueous and methanolic extracts of four Phyllanthus species (P.amarus, P.niruri, P.urinaria and P.watsonii) against skin melanoma and prostate cancer cells.

Matched MeSH terms: Melanoma/drug therapy; Melanoma/physiopathology*
Fulltext Circulating insulin-like growth factor I in relation to melanoma risk in the European prospective investigation into cancer and nutrition

Bradbury KE, Appleby PN, Tipper SJ, Travis RC, Allen NE, Kvaskoff M, et al.

Int J Cancer, 2019 03 01;144(5):957-966.
PMID: 30191956 DOI: 10.1002/ijc.31854

Insulin-like growth factor-I (IGF-I) regulates cell proliferation and apoptosis, and is thought to play a role in tumour development. Previous prospective studies have shown that higher circulating concentrations of IGF-I are associated with a higher risk of cancers at specific sites, including breast and prostate. No prospective study has examined the association between circulating IGF-I concentrations and melanoma risk. A nested case-control study of 1,221 melanoma cases and 1,221 controls was performed in the European Prospective Investigation into Cancer and Nutrition cohort, a prospective cohort of 520,000 participants recruited from 10 European countries. Conditional logistic regression was used to estimate odds ratios (ORs) for incident melanoma in relation to circulating IGF-I concentrations, measured by immunoassay. Analyses were conditioned on the matching factors and further adjusted for age at blood collection, education, height, BMI, smoking status, alcohol intake, marital status, physical activity and in women only, use of menopausal hormone therapy. There was no significant association between circulating IGF-I concentration and melanoma risk (OR for highest vs lowest fifth = 0.93 [95% confidence interval [CI]: 0.71 to 1.22]). There was no significant heterogeneity in the association between IGF-I concentrations and melanoma risk when subdivided by gender, age at blood collection, BMI, height, age at diagnosis, time between blood collection and diagnosis, or by anatomical site or histological subtype of the tumour (Pheterogeneity≥0.078). We found no evidence for an association between circulating concentrations of IGF-I measured in adulthood and the risk of melanoma.

Matched MeSH terms: Melanoma/etiology*; Melanoma/metabolism*
Fulltext The Role of PPARβ/δ in Melanoma Metastasis

Lim JCW, Kwan YP, Tan MS, Teo MHY, Chiba S, Wahli W, et al.

Int J Mol Sci, 2018 Sep 20;19(10).
PMID: 30241392 DOI: 10.3390/ijms19102860

BACKGROUND: Peroxisome proliferator⁻activated receptor (PPAR) β/δ, a ligand-activated transcription factor, is involved in diverse biological processes including cell proliferation, cell differentiation, inflammation and energy homeostasis. Besides its well-established roles in metabolic disorders, PPARβ/δ has been linked to carcinogenesis and was reported to inhibit melanoma cell proliferation, anchorage-dependent clonogenicity and ectopic xenograft tumorigenicity. However, PPARβ/δ's role in tumour progression and metastasis remains controversial.
METHODS: In the present studies, the consequence of PPARβ/δ inhibition either by global genetic deletion or by a specific PPARβ/δ antagonist, 10h, on malignant transformation of melanoma cells and melanoma metastasis was examined using both in vitro and in vivo models.
RESULTS: Our study showed that 10h promotes epithelial-mesenchymal transition (EMT), migration, adhesion, invasion and trans-endothelial migration of mouse melanoma B16/F10 cells. We further demonstrated an increased tumour cell extravasation in the lungs of wild-type mice subjected to 10h treatment and in Pparβ/δ-/- mice in an experimental mouse model of blood-borne pulmonary metastasis by tail vein injection. This observation was further supported by an increased tumour burden in the lungs of Pparβ/δ-/- mice as demonstrated in the same animal model.
CONCLUSION: These results indicated a protective role of PPARβ/δ in melanoma progression and metastasis.

Matched MeSH terms: Melanoma/genetics*; Melanoma/pathology
Fulltext Synergistic inhibition of melanoma xenografts by Brequinar sodium and Doxorubicin

Dorasamy MS, Ab A, Nellore K, Wong PF

Biomed Pharmacother, 2019 Feb;110:29-36.
PMID: 30458345 DOI: 10.1016/j.biopha.2018.11.010

Malignant melanoma continues to be a fatal disease for which novel and long-term curative breakthroughs are desired. One such innovative idea would be to assess combination therapeutic treatments - by way of combining two potentially effective and very different therapy. Previously, we have shown that DHODH inhibitors, A771726 and Brequinar sodium (BQR) induced cell growth impairment in melanoma cells. Similar results were seen with DHODH RNA interference (shRNA). In the present study, we showed that combination of BQR with doxorubicin resulted in synergistic and additive cell growth inhibition in these cells. In addition, in vivo studies with this combination of drugs demonstrated an almost 90% tumor regression in nude mice bearing melanoma tumors. Cell cycle regulatory proteins, cyclin B1 and its binding partner pcdc-2 and p21 were significantly downregulated and upregulated respectively following the combined treatment. Given that we have observed synergistic effects with BQR and doxorubicin, both in vitro and in vivo, these drugs potentially represent a new combination in the targeted therapy of melanoma.

Matched MeSH terms: Melanoma/drug therapy*; Melanoma/pathology
Fulltext Maternal melanoma with placental metastasis

Shuhaila A, Rohaizak M, Phang KS, Mahdy ZA

Singapore Med J, 2008 Mar;49(3):e71-2.
PMID: 18362990

A 40-year-old woman, a grand multipara with uncertain gestation, presented with severe, prolonged diarrhoea. She was previously diagnosed to have melanoma. Examination revealed gross ascites with hepatosplenomegaly and uterus corresponding to 29 weeks gestation. An emergency caesarean section confirmed widespread metastases to the ovaries, mesentery and placenta. A viable male foetus was delivered with features of intrauterine growth restriction. The baby survived, but the mother died a week later. This case highlights the importance of thoroughly assessing placentas and babies of patients with melanoma for metastases.

Matched MeSH terms: Melanoma/diagnosis*; Melanoma/secondary*
Ocular malignant melanoma - a report of two cases

Reddy SC, Darnal HK

Nepal J Ophthalmol, 2014 Jan;6(11):113-8.
PMID: 25341837 DOI: 10.3126/nepjoph.v6i1.10783

INTRODUCTION: Melanoma is a rare malignant tumour in the eye.
OBJECTIVE: To report two cases of malignant melanoma in the eye, one in the conjunctiva and the other in the choroid.
CASES: The first case was in a 49-year-old lady who presented with a swelling on the inner side of left upper eyelid. The vision was 6/6. On everting the eyelid, multiple, pigmented, nodular swellings were noted on the tarsal conjunctiva. Excision biopsy confirmed the diagnosis of malignant melanoma of the conjunctiva. A pigmented nodular swelling occurred on the lower bulbar conjunctiva in the same eye one-and-a-half years after the first presentation. There were no secondary nodules in the body. Excision biopsy confirmed malignant melanoma of the conjunctiva. The second case was in a 72-year-old lady who presented with pain and bleeding in the right eye. There was no perception of light. The cornea was hazy and the details behind it could not be seen. There was micro perforation of the cornea with oozing of blood and secondary glaucoma. B-scan ultrasonography of the right eye revealed an intraocular tumour. The histopathology of the enucleated eyeball confirmed the diagnosis of malignant melanoma of the choroid.
CONCLUSION: In the case of conjunctival melanoma, the occurrence of tumour at multiple sites and absence of recurrence at the original site suggests the possibility of de novo origin of the tumour. Secondary glaucoma and bleeding may be the presenting features of melanoma in the choroid.

Matched MeSH terms: Melanoma
Fulltext Inhibition of MAPKs, Myc/Max, NFκB, and hypoxia pathways by Phyllanthus prevents proliferation, metastasis and angiogenesis in human melanoma (MeWo) cancer cell line

Tang YQ, Jaganath IB, Manikam R, Sekaran SD

Int J Med Sci, 2014;11(6):564-77.
PMID: 24782645 DOI: 10.7150/ijms.7704

Melanoma is the most fatal form of skin cancer. Different signalling pathways and proteins will be differentially expressed to pace with the tumour growth. Thus, these signalling molecules and proteins are become potential targets to halt the progression of cancer. The present works were attempted to investigate the underlying molecular mechanisms of anticancer effects of Phyllanthus (P.amarus, P.niruri, P.urinaria and P.watsonii) on skin melanoma, MeWo cells.

Matched MeSH terms: Melanoma/drug therapy; Melanoma/genetics; Melanoma/pathology*
Fulltext Infiltrative cardiac lymphoma with tricuspid valve involvement in a young man

Abdullah HN, Nowalid WK

World J Cardiol, 2014 Feb 26;6(2):77-80.
PMID: 24575174 DOI: 10.4330/wjc.v6.i2.77

Cardiac metastases are among the topics with limited systematic reviews. Theoretically, the heart can be infiltrated by any malignancy with the ability to spread to distant structures. Thus far, no specific tumors are known to have a predilection for the heart, but some do metastasize more often than others, for example, melanoma and primary mediastinal tumors. We report a case of cardiac metastasis from a diffuse large B cell lymphoma in a young man. The peculiarity of this case is that besides the involvement of right ventricle and atrium, the tricuspid valve was also infiltrated. Valvular metastasis is rarely reported in the medical literature.

Matched MeSH terms: Melanoma
Fulltext Perceptions and opinions towards skin cancer prevention in Malaysia: a qualitative approach

Al-Naggar RA, Al-Naggar TH, Bobryshev YV

Asian Pac J Cancer Prev, 2011;12(4):995-9.
PMID: 21790240

INTRODUCTION: Malignant melanoma in particular is one of the few remaining cancers with an increasing incidence.

OBJECTIVES: The objective of this study is to explore the perceptions and opinions of young Malaysians towards skin cancer prevention.

METHODOLOGY: Focus group discussions were conducted among 33 medical science students from Management and Science University (MSU), Shah Alam, Malaysia, using convenience sampling. Students were divided into 4 focus groups consisting of 8, 8, 9 and 8 students respectively. The facilitator wrote down the conversations and data obtained were classified into various categories and analyzed manually.

RESULTS: The majority of the participants mentioned that overexposure to ultraviolet light is the commonest cause of skin cancer but also that the most benefit we get from sun ight is vitamin D synthesis. The majority mentioned that the best prevention measure for skin cancer is using a sunscreen, followed by limit exposure to the sun.

CONCLUSION: The present study demonstrated there is a lack of knowledge regarding screening methods and prevention measures of skin cancer. Therefore, there is a need to establish health education unit in all universities to educate all university students regarding various health problems including skin cancer prevention.

Matched MeSH terms: Melanoma/epidemiology*; Melanoma/prevention & control*; Melanoma/psychology
Fulltext A case of ear canal black pigment foreign body mimicking a melanoma

Pang EB, Pang KP

Med J Malaysia, 2015 Jun;70(3):198-9.
PMID: 26248784

Melanoma of the ear canal is extremely rare; due to its hidden area, most would present late in their history. We present the first case reported, of a black pigment foreign body mimicking a melanoma in the external auditory canal. A 14 year old Chinese male presented with right sided otalgia and itch. Otoscopic examination revealed an irregular black naevus in the right auditory canal. An intraoperative excision showed a black pigment foreign body giant cell reaction. Clinicians should be aware of the possibility of a foreign body granuloma of the ear canal that might mimic a melanoma.

Matched MeSH terms: Melanoma

Filters

Please provide feedback to Administrator ([email protected])

External Links