Effects of caspase 3 on hypertrophic scar fibroblasts in hematoporphyrin monomerthyl etherphotodynamic therapy (HMME-PDT)
10.3760/cma.j.issn.0412-4030.2011.11.013
- VernacularTitle:半胱氨酸天冬氨酸蛋白酶3在血卟啉单甲醚光动力学疗法中对瘢痕成纤维细胞的作用
- Author:
Cai HONG
;
Gu YING
;
Zeng JING
;
Sun QIANG
;
Dong NING
- Publication Type:Journal Article
- Keywords:
Keloid;
Hematoporphyrin photoradiation;
Fibroblasts;
Caspase 3
- From:
Chinese Journal of Dermatology
2011;44(11):793-796
- CountryChina
- Language:Chinese
-
Abstract:
ObjectiveTo investigate the role of caspase 3 in HMME-induced apoptosis in hypertrophic scar fibroblasts (HSFs).MethodsFibroblasts were obtained from 10 patients with untreated hypertrophic scar,and subjected to a primary culture.After 4 to 6 passages of culture,the HSFs were divided into 3 groups to remain untreated(control group),be treated with HMME followed by photodynamic therapy (HMME-PDT group),or the combination of HMME and Z-DEVD-FMK followed by photodynamic therapy (caspase 3 inhibitor group).At 12 hours after the therapy,HSFs were collected and immunofluorescence microscopy was used to observe the fluorescence intensity of caspase 3 after staining with fluorescein isocyanate (FITC) and popodium iodide (PI),flow cytometry was performed to determine the percentage of caspase 3-positive HSFs and apoptosis rate in HSFs after single staining with FITC and PI respectively.Results The fluorescence intensity of caspase 3 was weak in the control group and caspase 3 inhibitor group,but was strong in the HMME-PDT group.An increased percentage of caspase 3-positive HSFs was noted in the HMMEPDT group compared with the control group and caspase 3 inhibitor group(30.86％ ± 1.21％ vs.3.12％ ±0.28％ and 2.46％ ± 0.18％,t =19.92,21.76,both P ＜ 0.05).The apoptosis rate in HSFs was significantly higher in the HMME-PDT group and caspase 3 inhibitor group than in the control group(30.54％ ± 3.78％ and 10.46％ ± 2.15％ vs.2.45％ ± 0.22％,t =35.90,27.97,both P＜ 0.05),and higher in the HMME-PDT group than in the caspase 3 inhibitor group.ConclusionsThe apoptosis in HSFs induced by HMME-PDT is closely related to the activation of caspase 3,while caspase 3 seems to be dispensable for the apoptosis.
