ABSTRACT
<p><b>BACKGROUND</b>Topical tacrolimus has been used for vitiligo as a common treatment option for more than ten years while the underlying mechanism is still uncertain. The aim of this study was to investigate the direct effects of tacrolimus on the melanogenesis and migration on human A375 melanoma cells. The expression of c-KIT mRNA and protein of human A375 cells were also investigated.</p><p><b>METHODS</b>The cultured A375 human melanoma cells were randomly assigned to control and tacrolimus treatment groups (10, 10(2), 10(3) and 10(4) nmol/L). The cell proliferation was measured with Cell Counting Kit-8 assays. Melanin content was measured with NaOH method. Transwell migration assay was used to measure cell migration. The expression of c-KIT mRNA and protein were measured with real-time fluorescence quantitative polymerase chain reaction and immunohistochemistry respectively.</p><p><b>RESULTS</b>The cell proliferation of the 10(3) and 10(4) nmol/L tacrolimus groups were significantly lower (0.666 ± 0.062 and 0.496 ± 0.038) as compared with the control (0.841 ± 0.110, P < 0.05). The mean melanin content in all groups treated with different concentration of tacrolimus (10, 10(2), 10(3), 10(4) nmol/L) increased compared with the control group (P < 0.05). Dose-dependent increase in cell migration were seen in all tacrolimus-treated groups (P < 0.01). The expression of c-KIT mRNA level in A375 cells exposed to tacrolimus (10(3) and 10(4) nmol/L) had significantly increased by 3.03-fold and 3.19-fold respectively compared with the control (P < 0.05).</p><p><b>CONCLUSIONS</b>Although tacrolimus had no effects on cell proliferation on A375 human melanoma cells, it could increase the melanin content and cell migration. The expression of c-KIT mRNA and protein increased dose-dependently in tacrolimus-treated groups as compared with the control. Our study demonstrated that tacrolimus could enhance the melanogenesis and cell migration on A375 cells.</p>
Subject(s)
Humans , Cell Line, Tumor , Cell Movement , Genetics , Cell Proliferation , Immunohistochemistry , Melanins , Metabolism , Melanocytes , Cell Biology , Proto-Oncogene Proteins c-kit , Genetics , Metabolism , RNA, Messenger , Genetics , Tacrolimus , PharmacologyABSTRACT
Objective To investigate the curative effect of photodynamic therapy on acnes and summarize the nursing measures.Methods Twenty-four acne patients were treated with photodynamic therapy from our hospital.The nursing experience was summarized.Result Nineteen had complete recovery,3 significant improvement,and 2 mild improvement,with a total effective rate of 91.7%.Conclusion Health education on acnes,keeping the patients away from strong sunlight and instructing them to clean skin in a right way and timely treatment of complications are critical for the improvement of curative effect.
ABSTRACT
Objective:To study the effects of 1?,25-dihydroxyvitamin D 3 and UVB on cell proliferation and melanin synthesis of normal human melanocytes. Methods:Melanocytes of foreskins of healthy men were cultured and treated with various concentration of 1?,25-dihydroxyvitamin D 3 or UVB (55 mJ/cm 2),or both.Cell proliferation was measured with MTT assay .The synthesis of melanin was determined by chromatography. Results: 1?,25-dihydroxyvitamin D 3 and UVB could promote the proliferation of cultured melanocyte,and 1?,25-dihydroxyvitamin D 3 could promote the melanin synthesis.The significant concentration of 1?,25-dihydroxyvitamin D 3 ranging from 10 -7 to 10 -10 mol/L.Conclusion:1?,25-dihydroxyvitamin D 3 and UVB irradiation could promote the proliferation of melanocyte,which indicates that they might be effective in the treatment of vitiligo.
ABSTRACT
Objective To explore the expression of high selective A receptor of endothelin-1 (ETA-R) in melanocytes from normal human beings. Methods Normal human melanocytes were cultured and mR-NA expression of ETA-R in melanocytes was measured by reverse transcription-polymerase chain reaction. Results The mRNA expression of ETA-R was seen in melanocytes. Conclusion This study combined with other experiments suggests that endothelin-1 may affect melanocytes by high selective ETA-R which may con-tribute to the pathogenesis of vitiligo.
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Objective To study the expression of CD44V6 in human epidermal tumours and malignant melanoma. Methods The expression of CD44V6 was detected by an immunohistochemical technique in squamous cell carcinoma(SCC), basal cell carcinoma(BCC) and malignant melanoma(MM). Results CD44V6 was expressed on the membrane of tumour cells of 10 patients with SCC, and there was downregulation of CD44V6 expression which along with the decrease of differentiation of SCC tumour cells. Tumour cells of 8 patients with MM and 10 patients with BCC did not express CD44V6. Conclusion Our findings suggest that CD44V6 expression is correlated with the types of skin tumours.
ABSTRACT
Objective To study the effects of endothelin-1 (ET-1) and adrenocorticotropic hormone (ACTH) on the proliferation of cultured normal human melanocytes. Methods Normal human melanocytes were obtained from the foreskins of healthy men, and cultured in minimum essential medium (MEM) with 10% bovine serum. The cultured melanocytes of the 3rd passage were treated with various concentrations of ET-1 and ACTH. Cell proliferation was assessed by the MTT method. Results ET-1 (0.1 ~ 1 000 nmol/L) promoted the proliferation of cultured human melanocytes. ACTH (10-13 ~ 10-9 mol/L) also promoted the proliferation of cultured human melanocytes (P