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Plasma membrane fluidity in isolated rat hepatocytes: comparative study using DPH and TMA-DPH as fluorescent probes.
J Gastroenterol Hepatol. 1989 May-Jun; 4(3):221-7.JG

Abstract

The study of membrane fluidity is a rapidly expanding field of research and its interest in hepatology has been stressed recently. The present study is the first report concerned with the determination of membrane fluidity of isolated rat hepatocytes. The data have been compared with those obtained in plasma membrane fractions and subfractions (basolateral or canalicular) derived from homogenates. The fluorescent probes used to measure the fluidity were diphenylhexatriene (DPH) a 'classical' probe, and its derivative trimethylammoniodiphenylhexatriene (TMA-DPH) at 25 degrees C and at 37 degrees C. The values obtained with DPH were lower than those with TMA-DPH, probably due to the localization of the probes in different regions of the phospholipid bilayer. In addition, DPH revealed significant differences in the fluorescence polarization values obtained in isolated hepatocytes compared with membrane fractions, which was in contrast to TMA-DPH, where the respective values were of the same order of magnitude. This behaviour is probably due to the mobility of DPH in the membrane core and its rapid internalization into the cell, whereas TMA-DPH remains anchored for a long time on the cell surface. These findings suggest that TMA-DPH is a better probe than DPH for measuring the fluorescence polarization of whole isolated hepatocytes and that the use of different probes might be of help in exploring different zones of the membrane bilayer.

Authors+Show Affiliations

Postgraduate School of Gastroenterology, University of Ancona, School of Medicine, Italy.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

2491149

Citation

Benedetti, A, et al. "Plasma Membrane Fluidity in Isolated Rat Hepatocytes: Comparative Study Using DPH and TMA-DPH as Fluorescent Probes." Journal of Gastroenterology and Hepatology, vol. 4, no. 3, 1989, pp. 221-7.
Benedetti A, Ferretti G, Curatola G, et al. Plasma membrane fluidity in isolated rat hepatocytes: comparative study using DPH and TMA-DPH as fluorescent probes. J Gastroenterol Hepatol. 1989;4(3):221-7.
Benedetti, A., Ferretti, G., Curatola, G., Brunelli, E., Jézéquel, A. M., & Orlandi, F. (1989). Plasma membrane fluidity in isolated rat hepatocytes: comparative study using DPH and TMA-DPH as fluorescent probes. Journal of Gastroenterology and Hepatology, 4(3), 221-7.
Benedetti A, et al. Plasma Membrane Fluidity in Isolated Rat Hepatocytes: Comparative Study Using DPH and TMA-DPH as Fluorescent Probes. J Gastroenterol Hepatol. 1989 May-Jun;4(3):221-7. PubMed PMID: 2491149.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Plasma membrane fluidity in isolated rat hepatocytes: comparative study using DPH and TMA-DPH as fluorescent probes. AU - Benedetti,A, AU - Ferretti,G, AU - Curatola,G, AU - Brunelli,E, AU - Jézéquel,A M, AU - Orlandi,F, PY - 1989/5/1/pubmed PY - 1989/5/1/medline PY - 1989/5/1/entrez SP - 221 EP - 7 JF - Journal of gastroenterology and hepatology JO - J Gastroenterol Hepatol VL - 4 IS - 3 N2 - The study of membrane fluidity is a rapidly expanding field of research and its interest in hepatology has been stressed recently. The present study is the first report concerned with the determination of membrane fluidity of isolated rat hepatocytes. The data have been compared with those obtained in plasma membrane fractions and subfractions (basolateral or canalicular) derived from homogenates. The fluorescent probes used to measure the fluidity were diphenylhexatriene (DPH) a 'classical' probe, and its derivative trimethylammoniodiphenylhexatriene (TMA-DPH) at 25 degrees C and at 37 degrees C. The values obtained with DPH were lower than those with TMA-DPH, probably due to the localization of the probes in different regions of the phospholipid bilayer. In addition, DPH revealed significant differences in the fluorescence polarization values obtained in isolated hepatocytes compared with membrane fractions, which was in contrast to TMA-DPH, where the respective values were of the same order of magnitude. This behaviour is probably due to the mobility of DPH in the membrane core and its rapid internalization into the cell, whereas TMA-DPH remains anchored for a long time on the cell surface. These findings suggest that TMA-DPH is a better probe than DPH for measuring the fluorescence polarization of whole isolated hepatocytes and that the use of different probes might be of help in exploring different zones of the membrane bilayer. SN - 0815-9319 UR - https://www.unboundmedicine.com/medline/citation/2491149/Plasma_membrane_fluidity_in_isolated_rat_hepatocytes:_comparative_study_using_DPH_and_TMA_DPH_as_fluorescent_probes_ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0815-9319&date=1989&volume=4&issue=3&spage=221 DB - PRIME DP - Unbound Medicine ER -