scholarly journals COMPARISON OF APOPTOSIS IN CONTRALATERAL RENAL TUBULAR CELLS IN ORYCTALAGUS CUNICULUS DUE TO ARTIFICIAL UNILATERAL URETERAL OBSTRUCTION, WITH AND WITHOUT VERAPAMIL

1970 ◽  
Vol 17 (2) ◽  
Author(s):  
Djoyo M Boetoro ◽  
Soetojo Soetojo ◽  
Doddy M Soebadi ◽  
Endang Joewarini ◽  
Widodo J P
Keyword(s):  
Definitive Treatment ◽  
Control Group ◽  
Sham Operation ◽  
Silk Suture ◽  
Contralateral Kidney ◽  
Tubular Cells ◽  
Renal Tubular Cells ◽  
Ureter Obstruction ◽  
Renal Tubular ◽  
The Right

Objective: To compare the effects of verapamil on the contralateral kidney affected by unilateral ureter obstruction. Material & method: The right ureter of oryctalagus cuniculus rabbits, were obstructed surgically with silk suture material, and kept alive for 14 days. One group was obstructed without other treatment, one group was given verapamil from day 7 until day 14 of the obstruction. One group was obstructed and given verapamil from day 0 through day 14. One group was given a sham operation as a control group. The contralateral kidney of all groups were harvested and processed with ApopTag. The increase of apoptotic tubular cells compared to the control group was then analyzed between each group. Results: The highest increase in apoptotic cells was in the obstructed group without verapamil, but increased significantly compared to control (p<0,001). The groups which received verapamil had lower increase of apoptotic tubular cells, in the group given verapamil for 14 days lower than the group which received verapamil only for 7 days. Both the 7 to 14 and the 0 to 14 groups were significantly lower than the group without verapamil (p=0,035 and p<0,001 respectively). Conclusion: verapamil has a protective effect on the contralateral kidney by inhibiting apoptosis caused by unilateral ureter obstruction. While the definitive treatment for urinary obstruction is to relieve it, verapamil can protect the kidney in the mean time.

scholarly journals Empagliflozin attenuates diabetic tubulopathy by improving mitochondrial fragmentation and autophagy

2019 ◽  
Vol 317 (4) ◽  
pp. F767-F780 ◽  
Author(s):  
Yu Ho Lee ◽  
Sang Hoon Kim ◽  
Jun Mo Kang ◽  
Jin Hyung Heo ◽  
Dong-Jin Kim ◽  
...  
Keyword(s):  
Quality Control ◽  
Protein Expression ◽  
High Glucose ◽  
Mitochondrial Dynamics ◽  
Control Group ◽  
Mitochondrial Fragmentation ◽  
Mitochondrial Quality Control ◽  
Tubular Cells ◽  
Renal Tubular Cells ◽  
Renal Tubular

We examined the effects of empagliflozin, a selective inhibitor of Na+-glucose cotransporter 2, on mitochondrial quality control and autophagy in renal tubular cells in a diabetic environment in vivo and in vitro. Human renal proximal tubular cells (hRPTCs) were incubated under high-glucose conditions. Diabetes was induced with streptozotocin in male C57BL/6J mice. Improvements in mitochondrial biogenesis and balanced fusion-fission protein expression were noted in hRPTCs after treatment with empagliflozin in high-glucose media. Empagliflozin also increased autophagic activities in renal tubular cells in the high-glucose environment, which was accompanied with mammalian target of rapamycin inhibition. Moreover, reduced mitochondrial reactive oxygen species production and decreased apoptotic and fibrotic protein expression were observed in hRPTCs after treatment with empagliflozin, even in the hyperglycemic circumstance. Importantly, empagliflozin restored AMP-activated protein kinase-α phosphorylation and normalized levels of AMP-to-ATP ratios in hRPTCs subjected to a high-glucose environment, which suggests the way that empagliflozin is involved in mitochondrial quality control. Empagliflozin effectively suppressed Na+-glucose cotransporter 2 expression and ameliorated renal morphological changes in the kidneys of streptozotocin-induced diabetic mice. Electron microscopy analysis showed that mitochondrial fragmentation was decreased and 8-hydroxy-2′-deoxyguanosine content was low in renal tubular cells of empagliflozin treatment groups compared with those of the diabetic control group. We suggest one mechanism related to the renoprotective actions of empagliflozin, which reverse mitochondrial dynamics and autophagy.

scholarly journals Human antigen R regulates hypoxia‐induced mitophagy in renal tubular cells through PARKIN/BNIP3L expressions

2021 ◽  
Author(s):  
Shao‐Hua Yu ◽  
Kalaiselvi Palanisamy ◽  
Kuo‐Ting Sun ◽  
Xin Li ◽  
Yao‐Ming Wang ◽  
...  
Keyword(s):  
Tubular Cells ◽  
Human Antigen R ◽  
Renal Tubular Cells ◽  
Renal Tubular

scholarly journals Interleukin-22 attenuates renal tubular cells inflammation and fibrosis induced by TGF-β1 through Notch1 signaling pathway

Renal Failure ◽  
2020 ◽  
Vol 42 (1) ◽  
pp. 381-390 ◽  
Author(s):  
Rong Tang ◽  
Xiangcheng Xiao ◽  
Yang Lu ◽  
Huihui Li ◽  
Qiaoling Zhou ◽  
...  
Keyword(s):  
Signaling Pathway ◽  
Tubular Cells ◽  
Interleukin 22 ◽  
Renal Tubular Cells ◽  
Notch1 Signaling ◽  
Renal Tubular ◽  
Notch1 Signaling Pathway ◽  
Tgf Β1

scholarly journals Hepatocyte Nuclear Factor-1β Controls Mitochondrial Respiration in Renal Tubular Cells

2017 ◽  
Vol 28 (11) ◽  
pp. 3205-3217 ◽  
Author(s):  
Audrey Casemayou ◽  
Audren Fournel ◽  
Alessia Bagattin ◽  
Joost Schanstra ◽  
Julie Belliere ◽  
...  
Keyword(s):  
Mitochondrial Respiration ◽  
Nuclear Factor ◽  
Hepatocyte Nuclear Factor ◽  
Tubular Cells ◽  
Renal Tubular Cells ◽  
Renal Tubular

Dependency of Microdissected Nephron Segments upon Oxidative Phosphorylation and Exogenous Substrates: A Relationship between Tubular Anatomical Location in the Kidney and Metabolic Activity

1989 ◽  
Vol 77 (3) ◽  
pp. 287-295 ◽  
Author(s):  
Shozo Torikai
Keyword(s):  
Collecting Duct ◽  
Anatomical Location ◽  
Thick Ascending Limb ◽  
Tubular Cells ◽  
Renal Tubular Cells ◽  
Nephron Segments ◽  
Henle's Loop ◽  
Renal Tubular ◽  
Substrate Deprivation ◽  
Exogenous Substrates

1. In order to examine the possibility of heterogeneity in the dependence of renal tubular cells upon oxidative phosphorylation and exogenous substrates, the effects of antimycin A and substrate deprivation on adenosine 5′-triphosphate (ATP) content were examined in isolated rat nephron segments in vitro at 37°C. 2. Antimycin A (5 μmol/l) caused varying decrements in cell ATP level within 5 min in the following order: proximal tubules > cortical thick ascending limb of Henle's loop (cTAL) > cortical collecting duct (cCD) in the cortex, and thin descending limb of Henle's loop (TDL) > medullary thick ascending limb of Henle's loop (mTAL) > outer medullary collecting duct (omCD) in the inner stripe of the outer medulla. In the thick ascending limb and the collecting duct, the segments located in the cortex were more sensitive than those in the medulla. 3. Substrate deprivation for 30 min markedly decreased the cell ATP content in cortical and medullary proximal tubules and also in medullary TDL, whereas it caused only a slight decrease in cTAL and mTAL with no change in cCD and omCD. 4. Media made hypertonic by the addition of 200 mmol/l NaCl under aerobic conditions, increased the requirement for exogenous substrates in TDL and mTAL, but not in omCD. This stimulation was seen to a lesser extent in media made hypertonic by the addition of mannitol instead of NaCl. 5. Taking into consideration a knowledge of rat kidney architecture and intrarenal gradient of oxygen partial pressure, it is likely that the observed dependency upon both oxygen and exogenous substrates in the renal tubular cells reflects adaptation of such cells to their anatomical location, and to the availability of those substances in situ. Furthermore, extracellular sodium concentration and osmolarity stimulate metabolic requirements to a different extent among the nephron segments.

scholarly journals Cellular Uptake and Localization of Polymyxins in Renal Tubular Cells Using Rationally Designed Fluorescent Probes

2015 ◽  
Vol 59 (12) ◽  
pp. 7489-7496 ◽  
Author(s):  
Bo Yun ◽  
Mohammad A. K. Azad ◽  
Cameron J. Nowell ◽  
Roger L. Nation ◽  
Philip E. Thompson ◽  
...  
Keyword(s):  
Cellular Uptake ◽  
Rat Kidney ◽  
Antimicrobial Activities ◽  
Core Structure ◽  
Confocal Imaging ◽  
Limiting Factor ◽  
Tubular Cells ◽  
Renal Tubular Cells ◽  
Renal Tubular ◽  
Apoptotic Effects

ABSTRACTPolymyxins are cyclic lipopeptide antibiotics that serve as a last line of defense against Gram-negative bacterial superbugs. However, the extensive accumulation of polymyxins in renal tubular cells can lead to nephrotoxicity, which is the major dose-limiting factor in clinical use. In order to gain further insights into the mechanism of polymyxin-induced nephrotoxicity, we have rationally designed novel fluorescent polymyxin probes to examine the localization of polymyxins in rat renal tubular (NRK-52E) cells. Our design strategy focused on incorporating a dansyl fluorophore at the hydrophobic centers of the polymyxin core structure. To this end, four novel regioselectively labeled monodansylated polymyxin B probes (MIPS-9541, MIPS-9542, MIPS-9543, and MIPS-9544) were designed, synthesized, and screened for their antimicrobial activities and apoptotic effects against rat kidney proximal tubular cells. On the basis of the assessment of antimicrobial activities, cellular uptake, and apoptotic effects on renal tubular cells, incorporation of a dansyl fluorophore at either position 6 or 7 (MIPS-9543 and MIPS-9544, respectively) of the polymyxin core structure appears to be an appropriate strategy for generating representative fluorescent polymyxin probes to be utilized in intracellular imaging and mechanistic studies. Furthermore, confocal imaging experiments utilizing these probes showed evidence of partial colocalization of the polymyxins with both the endoplasmic reticulum and mitochondria in rat renal tubular cells. Our results highlight the value of these new fluorescent polymyxin probes and provide further insights into the mechanism of polymyxin-induced nephrotoxicity.

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