Cargando…
Expression and Function of K(ATP) Channels in Normal and Osteoarthritic Human Chondrocytes: Possible Role in Glucose Sensing
ATP-sensitive potassium [K(ATP)] channels sense intracellular ATP/ADP levels, being essential components of a glucose-sensing apparatus in various cells that couples glucose metabolism, intracellular ATP/ADP levels and membrane potential. These channels are present in human chondrocytes, but their s...
Autores principales: | , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Wiley Subscription Services, Inc., A Wiley Company
2013
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3736163/ https://www.ncbi.nlm.nih.gov/pubmed/23494827 http://dx.doi.org/10.1002/jcb.24532 |
_version_ | 1782279741708959744 |
---|---|
author | Rufino, Ana T Rosa, Susana C Judas, Fernando Mobasheri, Ali Lopes, M Celeste Mendes, Alexandrina F |
author_facet | Rufino, Ana T Rosa, Susana C Judas, Fernando Mobasheri, Ali Lopes, M Celeste Mendes, Alexandrina F |
author_sort | Rufino, Ana T |
collection | PubMed |
description | ATP-sensitive potassium [K(ATP)] channels sense intracellular ATP/ADP levels, being essential components of a glucose-sensing apparatus in various cells that couples glucose metabolism, intracellular ATP/ADP levels and membrane potential. These channels are present in human chondrocytes, but their subunit composition and functions are unknown. This study aimed at elucidating the subunit composition of K(ATP) channels expressed in human chondrocytes and determining whether they play a role in regulating the abundance of major glucose transporters, GLUT-1 and GLUT-3, and glucose transport capacity. The results obtained show that human chondrocytes express the pore forming subunits, Kir6.1 and Kir6.2, at the mRNA and protein levels and the regulatory sulfonylurea receptor (SUR) subunits, SUR2A and SUR2B, but not SUR1. The expression of these subunits was no affected by culture under hyperglycemia-like conditions. Functional impairment of the channel activity, using a SUR blocker (glibenclamide 10 or 20 nM), reduced the protein levels of GLUT-1 and GLUT-3 by approximately 30% in normal chondrocytes, while in cells from cartilage with increasing osteoarthritic (OA) grade no changes were observed. Glucose transport capacity, however, was not affected in normal or OA chondrocytes. These results show that K(ATP) channel activity regulates the abundance of GLUT-1 and GLUT-3, although other mechanisms are involved in regulating the overall glucose transport capacity of human chondrocytes. Therefore, K(ATP) channels are potential components of a broad glucose sensing apparatus that modulates glucose transporters and allows human chondrocytes to adjust to varying extracellular glucose concentrations. This function of K(ATP) channels seems to be impaired in OA chondrocytes. J. Cell. Biochem. 114: 1879–1889, 2013. © 2013 Wiley Periodicals, Inc. |
format | Online Article Text |
id | pubmed-3736163 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Wiley Subscription Services, Inc., A Wiley Company |
record_format | MEDLINE/PubMed |
spelling | pubmed-37361632013-08-07 Expression and Function of K(ATP) Channels in Normal and Osteoarthritic Human Chondrocytes: Possible Role in Glucose Sensing Rufino, Ana T Rosa, Susana C Judas, Fernando Mobasheri, Ali Lopes, M Celeste Mendes, Alexandrina F J Cell Biochem Articles ATP-sensitive potassium [K(ATP)] channels sense intracellular ATP/ADP levels, being essential components of a glucose-sensing apparatus in various cells that couples glucose metabolism, intracellular ATP/ADP levels and membrane potential. These channels are present in human chondrocytes, but their subunit composition and functions are unknown. This study aimed at elucidating the subunit composition of K(ATP) channels expressed in human chondrocytes and determining whether they play a role in regulating the abundance of major glucose transporters, GLUT-1 and GLUT-3, and glucose transport capacity. The results obtained show that human chondrocytes express the pore forming subunits, Kir6.1 and Kir6.2, at the mRNA and protein levels and the regulatory sulfonylurea receptor (SUR) subunits, SUR2A and SUR2B, but not SUR1. The expression of these subunits was no affected by culture under hyperglycemia-like conditions. Functional impairment of the channel activity, using a SUR blocker (glibenclamide 10 or 20 nM), reduced the protein levels of GLUT-1 and GLUT-3 by approximately 30% in normal chondrocytes, while in cells from cartilage with increasing osteoarthritic (OA) grade no changes were observed. Glucose transport capacity, however, was not affected in normal or OA chondrocytes. These results show that K(ATP) channel activity regulates the abundance of GLUT-1 and GLUT-3, although other mechanisms are involved in regulating the overall glucose transport capacity of human chondrocytes. Therefore, K(ATP) channels are potential components of a broad glucose sensing apparatus that modulates glucose transporters and allows human chondrocytes to adjust to varying extracellular glucose concentrations. This function of K(ATP) channels seems to be impaired in OA chondrocytes. J. Cell. Biochem. 114: 1879–1889, 2013. © 2013 Wiley Periodicals, Inc. Wiley Subscription Services, Inc., A Wiley Company 2013-08 2013-03-13 /pmc/articles/PMC3736163/ /pubmed/23494827 http://dx.doi.org/10.1002/jcb.24532 Text en Copyright © 2013 Wiley Periodicals, Inc. http://creativecommons.org/licenses/by/2.5/ Re-use of this article is permitted in accordance with the Creative Commons Deed, Attribution 2.5, which does not permit commercial exploitation. |
spellingShingle | Articles Rufino, Ana T Rosa, Susana C Judas, Fernando Mobasheri, Ali Lopes, M Celeste Mendes, Alexandrina F Expression and Function of K(ATP) Channels in Normal and Osteoarthritic Human Chondrocytes: Possible Role in Glucose Sensing |
title | Expression and Function of K(ATP) Channels in Normal and Osteoarthritic Human Chondrocytes: Possible Role in Glucose Sensing |
title_full | Expression and Function of K(ATP) Channels in Normal and Osteoarthritic Human Chondrocytes: Possible Role in Glucose Sensing |
title_fullStr | Expression and Function of K(ATP) Channels in Normal and Osteoarthritic Human Chondrocytes: Possible Role in Glucose Sensing |
title_full_unstemmed | Expression and Function of K(ATP) Channels in Normal and Osteoarthritic Human Chondrocytes: Possible Role in Glucose Sensing |
title_short | Expression and Function of K(ATP) Channels in Normal and Osteoarthritic Human Chondrocytes: Possible Role in Glucose Sensing |
title_sort | expression and function of k(atp) channels in normal and osteoarthritic human chondrocytes: possible role in glucose sensing |
topic | Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3736163/ https://www.ncbi.nlm.nih.gov/pubmed/23494827 http://dx.doi.org/10.1002/jcb.24532 |
work_keys_str_mv | AT rufinoanat expressionandfunctionofkatpchannelsinnormalandosteoarthritichumanchondrocytespossibleroleinglucosesensing AT rosasusanac expressionandfunctionofkatpchannelsinnormalandosteoarthritichumanchondrocytespossibleroleinglucosesensing AT judasfernando expressionandfunctionofkatpchannelsinnormalandosteoarthritichumanchondrocytespossibleroleinglucosesensing AT mobasheriali expressionandfunctionofkatpchannelsinnormalandosteoarthritichumanchondrocytespossibleroleinglucosesensing AT lopesmceleste expressionandfunctionofkatpchannelsinnormalandosteoarthritichumanchondrocytespossibleroleinglucosesensing AT mendesalexandrinaf expressionandfunctionofkatpchannelsinnormalandosteoarthritichumanchondrocytespossibleroleinglucosesensing |