Uncoupling of muscarinic cholinergic phosphoinositide signals in senescent cerebral cortical and hippocampal membranes

被引:20
作者
Ayyagari, PV
Gerber, M
Joseph, JA
Crews, FT
机构
[1] Univ N Carolina, Sch Med, Ctr Alcohol Studies, Chapel Hill, NC 27599 USA
[2] Univ Florida, Dept Pharmacol & Therapeut, Gainesville, FL USA
[3] Human Nutr Res Ctr Aging, Boston, MA USA
关键词
D O I
10.1016/S0197-0186(97)00044-2
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Muscarinic-cholinergic signals in brain are mediated in part through the hydrolysis of phosphoinositides (PtdIns) by phospholipase C (PLC). To test the hypothesis that muscarinic PtdIns signals change during aging, membranes were prepared from the cerebral cortex and hippocampus of young (4-6 months old), middle aged (8-10 months old) and senescent (24-26 months old) Fisher 344 rats. Carbachol dose-dependently increased [H-3]-PtdIns hydrolysis in both brain regions in all three age groups, however, in senescent rats the maximal response was decreased to 69.26 +/- 4.33% (p<0.01) in cortex and to 48.29 +/- 2.55% (p<0.01) in hippocampus of young rat values. In contrast to the decrease in carbachol-stimulated phosphoinositide hydrolysis, calcium-stimulated phosphoinositide hydrolysis was not altered. GTP gamma S also dose-dependently increased [H-3]-PtdIns hydrolysis in membranes from all three age groups through G-protein-PLC activation. Similar to carbachol, GTP gamma S-activated [H-3]-PtdIns hydrolysis was reduced approximately 40% in senescent rats membranes. Muscarinic receptor (mAChR) density, as determined by [H-3]-QNB binding decreased slightly in cortical membranes, but not in hippocampal membranes. These data suggest that muscarinic stimulated [H-3]-PtdIns responses are decreased in senescent brain primarily due to an uncoupling of the receptor-G-protein and/or G-protein-PLC link, although decreases in receptor density may also contribute to reduced muscarinic [H-3]-PtdIns signaling. (C) 1998 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:107 / 115
页数:9
相关论文
共 29 条
[1]   CHOLINERGIC MARKERS IN AGED COGNITIVELY IMPAIRED LONG-EVANS RATS [J].
AUBERT, I ;
ROWE, W ;
MEANEY, MJ ;
GAUTHIER, S ;
QUIRION, R .
NEUROSCIENCE, 1995, 67 (02) :277-292
[2]  
BURNETT DM, 1990, J PHARMACOL EXP THER, V255, P1265
[3]  
CLARO E, 1989, J BIOL CHEM, V264, P18288
[4]   CHOLINERGIC AND SEROTONERGIC STIMULATION OF PHOSPHOINOSITIDE HYDROLYSIS IS DECREASED IN ALZHEIMERS-DISEASE [J].
CREWS, FT ;
KURIAN, P ;
FREUND, G .
LIFE SCIENCES, 1994, 55 (25-26) :1993-2002
[5]  
CREWS FT, 1986, PSYCHOPHARMACOL BULL, V22, P775
[6]  
CREWS FT, 1994, NEUROBIOL AGING, V15, pS94
[7]   DIFFERENT EFFECTS OF N-ETHYLMALEIMIDE ON M1 AND M2 MUSCARINE RECEPTORS IN RAT-BRAIN [J].
FLYNN, DD ;
POTTER, LT .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1985, 82 (02) :580-583
[8]   AGE-DEPENDENT CHANGES IN TRANSMEMBRANE SIGNALING - IDENTIFICATION OF G-PROTEINS IN HUMAN-LYMPHOCYTES AND POLYMORPHONUCLEAR LEUKOCYTES [J].
FULOP, T ;
BARABAS, G ;
VARGA, Z ;
JOZSEF, C ;
CSABINA, S ;
SZUCS, S ;
SERES, I ;
SZIKSZAY, E ;
JENEY, Z ;
PENYIGE, A .
CELLULAR SIGNALLING, 1993, 5 (05) :593-603
[9]   REEXAMINATION OF THE APPARENT BINDING CONSTANT OF ETHYLENE-GLYCOL BIS-(BETA-AMINOETHYL ETHER)-N,N,N',N'-TETRAACETIC ACID WITH CALCIUM AROUND NEUTRAL PH [J].
HARAFUJI, H ;
OGAWA, Y .
JOURNAL OF BIOCHEMISTRY, 1980, 87 (05) :1305-1312
[10]   DISTURBANCES OF THE NEURONAL CALCIUM HOMEOSTASIS IN THE AGING NERVOUS-SYSTEM [J].
HARTMANN, H ;
ECKERT, A ;
MULLER, WE .
LIFE SCIENCES, 1994, 55 (25-26) :2011-2018