Journal of Peking University(Health Sciences) ›› 2017, Vol. 49 ›› Issue (1): 125-130. doi: 10.3969/j.issn.1671-167X.2017.01.023

• Article • Previous Articles     Next Articles

High glucose reduced the repair function of kidney stem cells conditional medium to  the hypoxia-injured renal tubular epithelium cells

YANG Guang1, CHENG Qing-li1△, LI Chun-lin2, JIA Ya-li3, YUE Wen3, PEI Xue-tao3, LIU Yang1, ZHAO Jia-hui1, DU Jing1, AO Qiang-guo1   

  1. (1. Department of Geriatric Nephrology, PLA General Hospital, State Key Laboratory of Kidney Disease, Beijing 100853, China; 2. Department of Geriatric Endocrinology, PLA General Hospital, Beijing 100853, China; 3. Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing 100850, China)
  • Online:2017-02-18 Published:2017-02-18
  • Contact: CHENG Qing-li E-mail:qlcheng64@163.com
  • Supported by:

    Supported by the National Natural Science Foundation of China (30772296, 81170312) and the Beijing Natural Science Foundation (7122163)

Abstract:

Objective: To evaluate the impacts of high glucose on the repair function of kidney stem cells (KSC) conditional medium to the hypoxia-injured renal tubular epithelium cells (RTEC). Me-thods: KSC were isolated from the renal papilla in 4-week-Sprague-Dawley rats. The KSC were pretreated in media with high glucose (30 mmol/L) or with normal glucose (5.6 mmol/L), respectively. The supernatants of the pre-treated KSC were collected as the conditional media. The hypoxia/reoxygenation (H/R) model of rat RTEC was established using the NRK-52E cell line. The effects of KSC conditional media on the H/R RTEC were investigated. Results: (1) The best H/R model of RTEC was established using hypoxia for 4 h and reoxygenation 2 h. (2) After hypoxia, the early and late cell apoptosis rates of the H/R RTEC were increased. The H/R RTEC were co-cultured with KSC conditional media for 12 h and 24 h, respectively. The H/R RTEC were co-cultured with DMEM/F12 as a control group. The cell apoptosis rate of H/R RTEC was lower after co-cultured with KSC conditional media (P<0.01), and the cell apoptosis rate of H/R RTEC in high glucose group was much higher than that in normal glucose group after co-cultured 24 h (P=0.02). (3) After hypoxia, the lactic dehydrogenase (LDH) and malondialdehyde (MDA) levels of the H/R RTEC supernatant were increased, and the superoxide dismutase (SOD) level decreased. The LDH and MDA levels were lower and the SOD level was higher after co-cultured with KSC conditional media for 12 h and 24 h, respectively (P<0.01). The LDH and MDA levels of H/R RTEC supernatant were much higher in the high glucose group than in the normal glucose group (P<0.05), and the SOD level of H/R RTEC supernatant was much lower in the high glucose group than in the normal glucose group (P<0.01). Conclusion: KSC conditional media could repair the H/R injury of RTEC. The effects were mainly by inhibiting cell apoptosis, and reducing oxidative stress; the anti-cell apoptosis ability and the anti-oxidative stress capacity of the conditional medium were reduced after KSC were pre-treated with high glucose.

Key words: Kidney, Stem cells, Hypoxia, Kidney tubules, Epithelial cells, Apoptosis, Oxidative stress

CLC Number: 

  • R692.6
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