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Increased expression of heat shock protein 72 protects renal proximal tubular cells from gentamicin-induced injury.

Wang Z, Liu L, Mei Q, Liu L, Ran Y, Zhang R - J. Korean Med. Sci. (2006)

Bottom Line: Both HSP72 protein and gene expression increased significantly at 72 hr when cells were treated with GM.It could reduce LDH release and NAG activity.HS also increased SOD activity, and decreased MDA content when cells were damaged by GM.

View Article: PubMed Central - PubMed

Affiliation: Department of Pharmacology, School of Pharmacy, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.

ABSTRACT
The nephrotoxicity of gentamicin (GM) has been widely recognized. Heat shock protein 72 (HSP72) has been reported to be a cytoprotectant. However, its cytoprotective effect against GM induced kidney injury has not yet been studied. In this study, we investigated the cytoprotective effect of HSP72 on GM-induced nephrotoxicity in vitro. Human Kidney tubular cell line, HK-2 cells were divided into four groups: control group, GM group (cells incubated with GM only), heat shock (HS) group (cells incubated at 43 degrees C for 30 min), and GM plus HS group, respectively. Lactate dehydrogenase (LDH) release increased time-dependently from 24 hr to 96 hr compared to the data of cells treated with GM only. Results of NAG activities, superoxide dismutase (SOD) activities and malondialdehyde (MDA) content were similar to that of the LDH release. The amount of HSP72 positive cells increased significantly at 72 hr after cells were treated with GM only. Both HSP72 protein and gene expression increased significantly at 72 hr when cells were treated with GM. On the other hand, HS induced HSP72 expression markedly. Pretreatment of HS inhibited HK-2 cells from GM-induced injury. It could reduce LDH release and NAG activity. HS also increased SOD activity, and decreased MDA content when cells were damaged by GM. These findings suggested that HS may protect kidney cells from GM-induced injury. Pre-induction of HSP72 may provide therapeutic strategies for nephrotoxicity induced by GM.

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Protective effects of heat shock (HS) from cytotoxicity induced by GM in HK-2 cells. Four groups of HK-2 cells were treated with medium only, HS, GM in 100 µg/mL and GM+HS, respectively, for 24 hr, 48 hr, 72 hr, 96 hr. LDH release was determined. Values are mean±SD of measurements from separate HK-2 cell cultures. Number of experiments (n)=6. *p<0.01 vs. control, †p<0.01 vs. GM group.
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Figure 2: Protective effects of heat shock (HS) from cytotoxicity induced by GM in HK-2 cells. Four groups of HK-2 cells were treated with medium only, HS, GM in 100 µg/mL and GM+HS, respectively, for 24 hr, 48 hr, 72 hr, 96 hr. LDH release was determined. Values are mean±SD of measurements from separate HK-2 cell cultures. Number of experiments (n)=6. *p<0.01 vs. control, †p<0.01 vs. GM group.

Mentions: LDH release was used as a marker of cytotoxicity. It increased time-dependently from 24 hr to 72 hr (Fig. 2). Although the increase of LDH release in GM+HS group was observed from 24 hr to 96 hr, it was lower than that of the GM-treated cells. After cells were heat shocked, LDH release increased from 24 hr to 72 hr, but it is lower than that of GM group.


Increased expression of heat shock protein 72 protects renal proximal tubular cells from gentamicin-induced injury.

Wang Z, Liu L, Mei Q, Liu L, Ran Y, Zhang R - J. Korean Med. Sci. (2006)

Protective effects of heat shock (HS) from cytotoxicity induced by GM in HK-2 cells. Four groups of HK-2 cells were treated with medium only, HS, GM in 100 µg/mL and GM+HS, respectively, for 24 hr, 48 hr, 72 hr, 96 hr. LDH release was determined. Values are mean±SD of measurements from separate HK-2 cell cultures. Number of experiments (n)=6. *p<0.01 vs. control, †p<0.01 vs. GM group.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2722003&req=5

Figure 2: Protective effects of heat shock (HS) from cytotoxicity induced by GM in HK-2 cells. Four groups of HK-2 cells were treated with medium only, HS, GM in 100 µg/mL and GM+HS, respectively, for 24 hr, 48 hr, 72 hr, 96 hr. LDH release was determined. Values are mean±SD of measurements from separate HK-2 cell cultures. Number of experiments (n)=6. *p<0.01 vs. control, †p<0.01 vs. GM group.
Mentions: LDH release was used as a marker of cytotoxicity. It increased time-dependently from 24 hr to 72 hr (Fig. 2). Although the increase of LDH release in GM+HS group was observed from 24 hr to 96 hr, it was lower than that of the GM-treated cells. After cells were heat shocked, LDH release increased from 24 hr to 72 hr, but it is lower than that of GM group.

Bottom Line: Both HSP72 protein and gene expression increased significantly at 72 hr when cells were treated with GM.It could reduce LDH release and NAG activity.HS also increased SOD activity, and decreased MDA content when cells were damaged by GM.

View Article: PubMed Central - PubMed

Affiliation: Department of Pharmacology, School of Pharmacy, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.

ABSTRACT
The nephrotoxicity of gentamicin (GM) has been widely recognized. Heat shock protein 72 (HSP72) has been reported to be a cytoprotectant. However, its cytoprotective effect against GM induced kidney injury has not yet been studied. In this study, we investigated the cytoprotective effect of HSP72 on GM-induced nephrotoxicity in vitro. Human Kidney tubular cell line, HK-2 cells were divided into four groups: control group, GM group (cells incubated with GM only), heat shock (HS) group (cells incubated at 43 degrees C for 30 min), and GM plus HS group, respectively. Lactate dehydrogenase (LDH) release increased time-dependently from 24 hr to 96 hr compared to the data of cells treated with GM only. Results of NAG activities, superoxide dismutase (SOD) activities and malondialdehyde (MDA) content were similar to that of the LDH release. The amount of HSP72 positive cells increased significantly at 72 hr after cells were treated with GM only. Both HSP72 protein and gene expression increased significantly at 72 hr when cells were treated with GM. On the other hand, HS induced HSP72 expression markedly. Pretreatment of HS inhibited HK-2 cells from GM-induced injury. It could reduce LDH release and NAG activity. HS also increased SOD activity, and decreased MDA content when cells were damaged by GM. These findings suggested that HS may protect kidney cells from GM-induced injury. Pre-induction of HSP72 may provide therapeutic strategies for nephrotoxicity induced by GM.

Show MeSH
Related in: MedlinePlus