URIDINE UPTAKE AND RNA-SYNTHESIS IN THE BRAIN OF TORPID AND AWAKENED GROUND-SQUIRRELS

被引:44
作者
BOCHAROVA, LS [1 ]
GORDON, RY [1 ]
ARKHIPOV, VI [1 ]
机构
[1] ACAD SCI USSR,INST CELL BIOPHYS,PUSHCHINO 142292,USSR
来源
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY | 1992年 / 101卷 / 1-2期
关键词
D O I
10.1016/0305-0491(92)90177-S
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
1. Uptake of [H-3]uridine into the nucleotide precursor pool after intraventricular injection occurs with the same intensity in the brain of torpid and normothermic awakened ground squirrels. This indicates that the membrane uridine transporters and uridine kinases operate in the hibernator's brain in a hypothermia-tolerant way. 2. Utilization of the [H-3]uridine pool for synthesis of the rapidly labelled RNA in the brain of torpid ground squirrels falls more than eight times against RNA labelling in the brain of the active animals between bouts of hibernation. 3. Two hours from the beginning of the artificially provoked awakening, RNA uridine incorporation in the brain of ground squirrels has risen 6.5 times. 4. Drastic changes in [H-3]uridine RNA labelling under the stable uridine uptake exclude the precursors and energy supply as the main factors determining changes in intensity of the brain RNA synthesis in the different stages of hibernation.
引用
收藏
页码:189 / 192
页数:4
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