title: [Study on related proteins of proliferation and differentiation of epidermal stem cells in diabetic rats].
abstract: OBJECTIVE
  Epidermal stem cells (ESCs) can actively participate in wound healing and enhance reepithelialization. To establish ideal diabetes mellitus (DM) rat models and to investigate the expression of keratin 19 (K19), beta1-integrin, beta-catenin, and proliferating cell nuclear antigen (PCNA) in ESCs of DM rat model, then to study the potential mechanism of difficult recovering wounds of diabetic skin.
  
  
  METHODS
  Twenty male SD rats (weighing 250-300 g) were divided into DM group and normal control group randomly (n=10). The DM rat model was made by intraperitoneal injected 65 mg/kg streptozocin (STZ), the normal control group was not treated. At 4 weeks after injection, pancreatic tissue was harvested for HE staining in two groups. The ESCs isolated from full-thickness skins of the back of two group rats were cultured and identified. The 2nd passage of ESCs were obtained for immunocytochemical staining of K 19, beta1-integrin, beta-catenin, and PCNA. Meanwhile, the cell cycle were measured by flow cytometry. The cell colony formation rates were detected after 1 week.
  
  
  RESULTS
  The achievement ratio of DM rat model was 90% with good stability. HE staining showed that the number of islet cells significantly decreased with degeneration and necrosis in DM group; the structure of islet cell was clear without degeneration and necrosis in normal control group. The integral absorbance values of positive expression for K19, beta1-integrin, beta-catenin, and PCNA in ESCs of DM group (82.63 +/- 14.77, 21.59 +/- 4.71, 6.49 +/- 6.58, and 90.77 +/- 12.44, respectively) were significantly lower than those in the normal control group (151.24 +/- 42.83, 54.48 +/- 17.43, 116.39 +/- 9.26, and 110.62 +/- 20.67, respectively) (P < 0.01). The clone forming efficiency of ESCs in DM group (6.43% +/- 1.01%) was significantly lower than that in the normal control group (11.37% +/- 1.62%) (P < 0.01). Flow cytometry indicated that 88.89% of cultured ESCs in the DM group were in resting state/pre-DNA-synthetic gap (G0/G1), and the apoptosis rate was 3.98%; 91.50% in the normal control group and the apoptosis rate was 0.
  
  
  CONCLUSIONS
  The DM rat model can be effectively induced by intraperitoneal injected 65 mg/kg STZ. The decreased amount and the low proliferation and differentiation capacity of ESCs may be one of the important mechanisms of difficult recovering wounds of DM rats.
authors.affiliation: Department of Basic Nursing, Medical College of Nanchang University, Nanchang Jiangxi, 330006, P.R. China.
authors.forename: Qingling
authors.initials: Q
authors.lastname: Zhong
authors.forename: Dewu
authors.initials: D
authors.lastname: Liu
authors.forename: Fanrong
authors.initials: F
authors.lastname: Liu
authors.forename: Yan
authors.initials: Y
authors.lastname: Peng
authors.forename: Xiangrong
authors.initials: X
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Lan
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D049109:Cell Proliferation; D002478:Cells, Cultured; D003921:Diabetes Mellitus, Experimental / Q000378:metabolism* / Q000473:pathology; D000078404:Epidermal Cells; D004817:Epidermis / Q000378:metabolism; D019012:Integrin beta1 / Q000378:metabolism*; D053539:Keratin-19 / Q000378:metabolism*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism; D014945:Wound Healing; D051176:beta Catenin / Q000378:metabolism*
chemical_list: C495268:Ctnnb1 protein, rat; D019012:Integrin beta1; D053539:Keratin-19; D051176:beta Catenin