Skin aging is a process of structural and compositional remodeling that can be manifested by wrinkling and sagging. Remarkably, the dermis plays a dominant role in the aging process. Recent studies suggest that microR...Skin aging is a process of structural and compositional remodeling that can be manifested by wrinkling and sagging. Remarkably, the dermis plays a dominant role in the aging process. Recent studies suggest that microRNAs are implicated in the regulation of gene expression during aging. However, studies about age-related microRNAs and how they modulate skin aging remain limited. In the present work, a complex of hydrolyzed natural yeast proteins (Saccharomyces cerevisiae) and hydrolyzed natural soya bean was developed and showed the ability to modulate the expression of telomere-binding protein TRF2, which is a key factor for telomere protection and to prevent cellular senescence in vitro and DNA damage. The aim of the study was to identify microRNAs specifically modulated after application of the ingredient complex to cultured fibroblasts, and their possible involvement in remodeling of the human extracellular matrix and fibroblast senescence. Consequently, human skin fibroblasts were cultured and treated with 1% of the ingredient complex for 48 h before analyzing microRNA modulation by RT-qPCR. The use of bioinformatics allowed us to predict the target genes for modulated microRNAs. Results show that the ingredient complex modulated a pattern of microRNAs including the down-regulation of miR-29a-3p, miR-30a-5p and miR-34a-5p, which are associated with fibroblast senescence and remodeling of the human dermal extracellular matrix. In conclusion, our results indicate that miR-29a-3p, miR-30a-5p and miR-34a-5p possibly represent key microRNAs that impact human fibroblast senescence and remodeling of the dermal extracellular matrix.展开更多
Objective:To evaluate the biomarkers of oxidative stress in herpes zoster patients compared with control subjects.Methods:This study compared the nitric oxide(NO),hydrogen peroxide(H2 O2),malon dialdehyde,uric acid,an...Objective:To evaluate the biomarkers of oxidative stress in herpes zoster patients compared with control subjects.Methods:This study compared the nitric oxide(NO),hydrogen peroxide(H2 O2),malon dialdehyde,uric acid,and bilirubin levels between 43 herpes zoster patients and 47 age-matched control subjects.The area under the curve of the receiver operating characteristic curve was performed to evaluate the final logistic regression model.Results:The significant differences were observed in the serum levels of NO,H2 O2,and malondialdehyde between the case and the control groups(P<0.001).However,no statistical differences were found in both uricacid and bilirubin levels between the groups.Additionally,the raised oxidant biomarkers were strongly associated with increased disease severity(P<0.001).Multiple logistic regression analysis with the highest area under the curve[0.98(95%CI 0.95-1.00)]and the minimum number of variables showed that high levels of NO(OR 1.24;95%CI 1.06-1.46;P=0.008)and H2 O2(OR 1.25;95%CI 1.09-1.43;P=0.001)were associated with herpes zoster.Conclusions:High levels of NO and H2 O2 were observed in patients with herpes zoster.Increased NO and H2 O2 levels might be associated with herpes zoster,which needs to be confirmed by further studies.展开更多
We report four disseminated cutaneous leishmaniasis(DCL) cases referred to leishmaniasis laboratory at the School of Public Health,Tehran University of Medical Sciences with multiple nodular,ulcerative and crusted les...We report four disseminated cutaneous leishmaniasis(DCL) cases referred to leishmaniasis laboratory at the School of Public Health,Tehran University of Medical Sciences with multiple nodular,ulcerative and crusted lesions extended on the face,trunk,and extremities.None of the patients had any complication and historical involvement in their immunological system conditions that suggest as the criteria for DCL.Direct smears of ulcers were positive for Leishmania parasite.The parasite was isolated from the active lesions and identified as Leishmania major(L major) using PCR-RFLP assay and sequencing analysis.展开更多
文摘Skin aging is a process of structural and compositional remodeling that can be manifested by wrinkling and sagging. Remarkably, the dermis plays a dominant role in the aging process. Recent studies suggest that microRNAs are implicated in the regulation of gene expression during aging. However, studies about age-related microRNAs and how they modulate skin aging remain limited. In the present work, a complex of hydrolyzed natural yeast proteins (Saccharomyces cerevisiae) and hydrolyzed natural soya bean was developed and showed the ability to modulate the expression of telomere-binding protein TRF2, which is a key factor for telomere protection and to prevent cellular senescence in vitro and DNA damage. The aim of the study was to identify microRNAs specifically modulated after application of the ingredient complex to cultured fibroblasts, and their possible involvement in remodeling of the human extracellular matrix and fibroblast senescence. Consequently, human skin fibroblasts were cultured and treated with 1% of the ingredient complex for 48 h before analyzing microRNA modulation by RT-qPCR. The use of bioinformatics allowed us to predict the target genes for modulated microRNAs. Results show that the ingredient complex modulated a pattern of microRNAs including the down-regulation of miR-29a-3p, miR-30a-5p and miR-34a-5p, which are associated with fibroblast senescence and remodeling of the human dermal extracellular matrix. In conclusion, our results indicate that miR-29a-3p, miR-30a-5p and miR-34a-5p possibly represent key microRNAs that impact human fibroblast senescence and remodeling of the dermal extracellular matrix.
基金supported by Skin Research Center,Shahid Beheshti University of Medical Sciences,and this manuscript is based on PhD thesis(No.9409)of Dr.Marjan Khazan
文摘Objective:To evaluate the biomarkers of oxidative stress in herpes zoster patients compared with control subjects.Methods:This study compared the nitric oxide(NO),hydrogen peroxide(H2 O2),malon dialdehyde,uric acid,and bilirubin levels between 43 herpes zoster patients and 47 age-matched control subjects.The area under the curve of the receiver operating characteristic curve was performed to evaluate the final logistic regression model.Results:The significant differences were observed in the serum levels of NO,H2 O2,and malondialdehyde between the case and the control groups(P<0.001).However,no statistical differences were found in both uricacid and bilirubin levels between the groups.Additionally,the raised oxidant biomarkers were strongly associated with increased disease severity(P<0.001).Multiple logistic regression analysis with the highest area under the curve[0.98(95%CI 0.95-1.00)]and the minimum number of variables showed that high levels of NO(OR 1.24;95%CI 1.06-1.46;P=0.008)and H2 O2(OR 1.25;95%CI 1.09-1.43;P=0.001)were associated with herpes zoster.Conclusions:High levels of NO and H2 O2 were observed in patients with herpes zoster.Increased NO and H2 O2 levels might be associated with herpes zoster,which needs to be confirmed by further studies.
基金supported by School of Public Health, Tehran University of Medical Sciences
文摘We report four disseminated cutaneous leishmaniasis(DCL) cases referred to leishmaniasis laboratory at the School of Public Health,Tehran University of Medical Sciences with multiple nodular,ulcerative and crusted lesions extended on the face,trunk,and extremities.None of the patients had any complication and historical involvement in their immunological system conditions that suggest as the criteria for DCL.Direct smears of ulcers were positive for Leishmania parasite.The parasite was isolated from the active lesions and identified as Leishmania major(L major) using PCR-RFLP assay and sequencing analysis.
