Lo 2018 Am J Physiol Renal Physiol: Difference between revisions
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|journal=Am J Physiol Renal Physiol | |journal=Am J Physiol Renal Physiol | ||
|abstract=Identification of renal cold storage (CS)-related pathways that lead to renal damage after transplantation (Tx) will help us design new pathway-specific therapies to improve graft outcome. Our recent report showed that mitochondrial function was compromised after CS alone, and this was exacerbated when CS was combined with Tx (CS/Tx). The goal of this study was to determine whether proteasome pathways are involved with exacerbation of mitochondrial dysfunction after CS/Tx. Kidneys of male rats and NRK cells were exposed to CS/Tx or rewarming (CS/RW), respectively. To compare CS-induced effects, kidney Tx without CS exposure (ATx) was also used. Our study provides the first evidence that chymotrypsin-like (ChT-L) peptidase activity of the proteasome declined only after CS/Tx or CS/RW, but not after CS or ATx. Interestingly, key mitochondrial respiratory proteins (SDHA and ATP5B) were detected in the detergent-insoluble fraction after CS/Tx or CS/RW. Pharmacologic inhibition of ChT-L activity in NRK cells also resulted in increased levels of SDHA and ATP5B in the insoluble fraction, as well as reduced activities of complexes I and II. On the other hand, antimycin A inhibition of mitochondrial respiration in NRK cells resulted in compromised ChT-L function and increased amounts of SDHA and ATP5B in the insoluble fraction. Our results suggest that mitochondrial respiratory dysfunction during CS precedes compromised ChT-L function after CS/Tx, and proteasome dysfunction further leads to altered mitochondrial protein homeostasis and reduced respiration in kidneys after CS/Tx. Therefore, therapeutics that could preserve mitochondrial and proteasome function during CS may provide beneficial outcomes following transplantation. | |abstract=Identification of renal cold storage (CS)-related pathways that lead to renal damage after transplantation (Tx) will help us design new pathway-specific therapies to improve graft outcome. Our recent report showed that mitochondrial function was compromised after CS alone, and this was exacerbated when CS was combined with Tx (CS/Tx). The goal of this study was to determine whether proteasome pathways are involved with exacerbation of mitochondrial dysfunction after CS/Tx. Kidneys of male rats and NRK cells were exposed to CS/Tx or rewarming (CS/RW), respectively. To compare CS-induced effects, kidney Tx without CS exposure (ATx) was also used. Our study provides the first evidence that chymotrypsin-like (ChT-L) peptidase activity of the proteasome declined only after CS/Tx or CS/RW, but not after CS or ATx. Interestingly, key mitochondrial respiratory proteins (SDHA and ATP5B) were detected in the detergent-insoluble fraction after CS/Tx or CS/RW. Pharmacologic inhibition of ChT-L activity in NRK cells also resulted in increased levels of SDHA and ATP5B in the insoluble fraction, as well as reduced activities of complexes I and II. On the other hand, antimycin A inhibition of mitochondrial respiration in NRK cells resulted in compromised ChT-L function and increased amounts of SDHA and ATP5B in the insoluble fraction. Our results suggest that mitochondrial respiratory dysfunction during CS precedes compromised ChT-L function after CS/Tx, and proteasome dysfunction further leads to altered mitochondrial protein homeostasis and reduced respiration in kidneys after CS/Tx. Therefore, therapeutics that could preserve mitochondrial and proteasome function during CS may provide beneficial outcomes following transplantation. | ||
|keywords=Ubiquitin proteasome system, Cold storage, Mitochondria, Transplantation | |keywords=Ubiquitin proteasome system, Cold storage, Mitochondria, Transplantation, NRK-52E Normal rat kidney proximal tubular cells | ||
|editor=[[Plangger M]], | |editor=[[Plangger M]], | ||
|mipnetlab=US AR Little Rock MacMillan-Crow LA | |mipnetlab=US AR Little Rock MacMillan-Crow LA | ||
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|injuries=Cryopreservation | |injuries=Cryopreservation | ||
|organism=Rat | |organism=Rat | ||
|tissues=Kidney | |tissues=Kidney, Other cell lines | ||
|preparations=Permeabilized cells | |preparations=Permeabilized cells | ||
|enzymes=Complex V;ATP synthase | |enzymes=Complex II;succinate dehydrogenase, Complex V;ATP synthase | ||
|couplingstates=OXPHOS | |couplingstates=LEAK, OXPHOS | ||
|pathways=N, S, ROX | |pathways=N, S, ROX | ||
|instruments=Oxygraph-2k | |instruments=Oxygraph-2k | ||
|additional= | |additional=2018-10, | ||
}} | }} |
Latest revision as of 12:47, 22 May 2019
Lo S, MacMillan-Crow LA, Parajuli N (2018) Renal cold storage followed by transplantation impairs proteasome function and subsequently mitochondrial protein homeostasis. Am J Physiol Renal Physiol 316:F42-F53. |
Lo S, MacMillan-Crow LA, Parajuli N (2018) Am J Physiol Renal Physiol
Abstract: Identification of renal cold storage (CS)-related pathways that lead to renal damage after transplantation (Tx) will help us design new pathway-specific therapies to improve graft outcome. Our recent report showed that mitochondrial function was compromised after CS alone, and this was exacerbated when CS was combined with Tx (CS/Tx). The goal of this study was to determine whether proteasome pathways are involved with exacerbation of mitochondrial dysfunction after CS/Tx. Kidneys of male rats and NRK cells were exposed to CS/Tx or rewarming (CS/RW), respectively. To compare CS-induced effects, kidney Tx without CS exposure (ATx) was also used. Our study provides the first evidence that chymotrypsin-like (ChT-L) peptidase activity of the proteasome declined only after CS/Tx or CS/RW, but not after CS or ATx. Interestingly, key mitochondrial respiratory proteins (SDHA and ATP5B) were detected in the detergent-insoluble fraction after CS/Tx or CS/RW. Pharmacologic inhibition of ChT-L activity in NRK cells also resulted in increased levels of SDHA and ATP5B in the insoluble fraction, as well as reduced activities of complexes I and II. On the other hand, antimycin A inhibition of mitochondrial respiration in NRK cells resulted in compromised ChT-L function and increased amounts of SDHA and ATP5B in the insoluble fraction. Our results suggest that mitochondrial respiratory dysfunction during CS precedes compromised ChT-L function after CS/Tx, and proteasome dysfunction further leads to altered mitochondrial protein homeostasis and reduced respiration in kidneys after CS/Tx. Therefore, therapeutics that could preserve mitochondrial and proteasome function during CS may provide beneficial outcomes following transplantation. โข Keywords: Ubiquitin proteasome system, Cold storage, Mitochondria, Transplantation, NRK-52E Normal rat kidney proximal tubular cells โข Bioblast editor: Plangger M โข O2k-Network Lab: US AR Little Rock MacMillan-Crow LA
Labels: MiParea: Respiration, mt-Medicine
Stress:Cryopreservation Organism: Rat Tissue;cell: Kidney, Other cell lines Preparation: Permeabilized cells Enzyme: Complex II;succinate dehydrogenase, Complex V;ATP synthase
Coupling state: LEAK, OXPHOS Pathway: N, S, ROX HRR: Oxygraph-2k
2018-10