Document Detail

A new mitochondrial pH biosensor for quantitative assessment of pancreatic β-cell function.
MedLine Citation:
PMID:  22465007     Owner:  NLM     Status:  Publisher    
Mitochondrial pH is a key determinant of mitochondrial energy metabolism. We have developed a new fluorescence-based ratiometric pH biosensor using a chloride-insensitive and hydrogen-sensitive probe for direct, quantitative and bleaching-free measurement in a living cell. Fusing this biosensor with a mitochondrial localization signal (MTpHGV) allowed us to determine mitochondrial pH. This new system was applied to measure mitochondrial pH in pancreatic β-cells, in which mitochondrial function plays a pivotal role in insulin secretion. Rat INS1 cells and mouse MIN6 cells are transfected with MTpHGV stably to monitor mitochondrial pH. While carbonyl cyanide 3-chlorophenylhydrazone (CCCP) treatment rapidly decreased mitochondrial pH in cultured rat MTpHGV-INS-1 cells, MTpHGV-MIN6 cells showed a rapid increase. These data suggest that MTpHGV probe exist in matrix side in INS-1 cells, but on the outer side of mitochondrial inner membrane in MIN6 cells. Moreover, while MTpHGV-INS-1 cells showed a rapid increase of pH by glucose stimulation, mitochondrial pH decreased quickly by glucose stimulation in all MTpHGV-MIN6 cells examined and recovered smoothly. Perfusion study of glucose load in MTpHGV-MIN6 cells under aminooxyacetate (AOA) or 100μM diazoxide showed that this mitochondrial pH acidification was dependent on nicotinamide adenine dinucleotide (NADH) shuttle, but independent from KATP channel. This new system for measuring mitochondrial pH is sensitive across the range of physiologic conditions and may be a useful tool for evaluating mitochondrial function in living cells.
Makiko Ogata; Takeo Awaji; Naoko Iwasaki; Risa Fujimaki; Miho Takizawa; Kei Maruyama; Yasuhiko Iwamoto; Yasuko Uchigata
Related Documents :
22505017 - Recombinant human albumin supports single cell cloning of cho cells in chemically defin...
12076277 - Isolation of exfoliated colonocytes from human stool as a new technique for colonic cyt...
7165487 - Winding anomalies in nuclear dna from malignant cells. i. experimental evidence.
22696497 - E-cadherin and, in its absence, n-cadherin promotes nanog expression in mes cells via s...
7217367 - Further evidence of an early critical period in the development of the cat's dorsal lat...
111647 - An experimental model for the study of hepatic transport and metabolism of toxic compou...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-23
Journal Detail:
Title:  Biochemical and biophysical research communications     Volume:  -     ISSN:  1090-2104     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-4-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372516     Medline TA:  Biochem Biophys Res Commun     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Inc.
Diabetes Center, Tokyo Women's Medical University, Tokyo, Japan.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  A structurally novel hemopexin fold protein of rice plays role in chlorophyll degradation.
Next Document:  How do tumor stem cells actively escape from host immunosurveillance?