Brain of the conscious dog is sensitive to physiological changes in circulating insulin

被引:24
作者
Davis, SN
Dunham, B
Walmsley, K
Shavers, C
Neal, D
Williams, P
Cherrington, AD
机构
[1] VANDERBILT UNIV, SCH MED, CTR DIABET RES & TRAINING, DEPT MED, NASHVILLE, TN 37232 USA
[2] VANDERBILT UNIV, SCH MED, DEPT MOL PHYSIOL, NASHVILLE, TN 37232 USA
[3] VANDERBILT UNIV, SCH MED, DEPT BIOPHYS, NASHVILLE, TN 37232 USA
来源
AMERICAN JOURNAL OF PHYSIOLOGY-ENDOCRINOLOGY AND METABOLISM | 1997年 / 272卷 / 04期
关键词
epinephrine; hypoglycemia; glucagon; autonomic nervous system;
D O I
10.1152/ajpendo.1997.272.4.E567
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
The aim of this study was to determine whether a selective, physiologically relevant increase in blood-borne insulin perfusing the brain has an impact on the counterregulatory response to hypoglycemia. Experiments were carried out on 12 conscious 18-h-fasted dogs. Insulin was infused (1 mU.kg(-1).min(-1)) in separate, randomized studies into a peripheral vein (n = 6) or both carotid and vertebral arteries (n = 6). This resulted in equivalent systemic insulinemia (38 +/- 2 vs. 35 +/- 5 mu U/ml) but differing head insulin levels (38 +/- 2 mu U/ml during peripheral infusion and an estimated 90 mu U/ml during head insulin infusion). Glucose was infused during peripheral insulin infusion to equate the level of hypoglycemia (58 +/- 2 mg/dl) to that obtained during head insulin infusion (57 +/- 2 mg/dl). Despite equivalent peripheral insulin levels and hypoglycemia, incremental area under the curve responses for epinephrine, glucagon and cortisol were increased during head insulin infusion (P < 0.05). Net hepatic glucose output, gluconeogenesis, and lipolysis were increased 50-100% (P < 0.05) during head compared with peripheral insulin infusion. We conclude that during hypoglycemia in the conscious dog 1) physiologically relevant increases of blood-borne insulin to the head can amplify neuroendocrine and metabolic counterregulatory responses and 2) glucagon secretion can be regulated, in part, by neural efferent activity.
引用
收藏
页码:E567 / E575
页数:9
相关论文
共 50 条
[1]   HYPERINSULINEMIA PRODUCES BOTH SYMPATHETIC NEURAL ACTIVATION AND VASODILATION IN NORMAL HUMANS [J].
ANDERSON, EA ;
HOFFMAN, RP ;
BALON, TW ;
SINKEY, CA ;
MARK, AL .
JOURNAL OF CLINICAL INVESTIGATION, 1991, 87 (06) :2246-2252
[2]   THE SYMPATHETIC RESPONSE TO EUGLYCEMIC HYPERINSULINEMIA - EVIDENCE FROM MICROELECTRODE NERVE RECORDINGS IN HEALTHY-SUBJECTS [J].
BERNE, C ;
FAGIUS, J ;
POLLARE, T ;
HJEMDAHL, P .
DIABETOLOGIA, 1992, 35 (09) :873-879
[3]   ROLE OF BRAIN IN COUNTERREGULATION OF INSULIN-INDUCED HYPOGLYCEMIA IN DOGS [J].
BIGGERS, DW ;
MYERS, SR ;
NEAL, D ;
STINSON, R ;
COOPER, NB ;
JASPAN, JB ;
WILLIAMS, PE ;
CHERRINGTON, AD ;
FRIZZELL, RT .
DIABETES, 1989, 38 (01) :7-16
[4]   ASSAY OF PLASMA-CATECHOLAMINES BY LIQUID-CHROMATOGRAPHY WITH ELECTROCHEMICAL DETECTION [J].
CAUSON, RC ;
CARRUTHERS, ME ;
RODNIGHT, R .
ANALYTICAL BIOCHEMISTRY, 1981, 116 (01) :223-226
[5]   EFFECT OF GLUCAGON ON GLUCOSE PRODUCTION DURING INSULIN DEFICIENCY IN DOG [J].
CHERRINGTON, AD ;
LACY, WW ;
CHIASSON, JL .
JOURNAL OF CLINICAL INVESTIGATION, 1978, 62 (03) :664-677
[6]   EFFECT OF EPINEPHRINE ON GLYCOGENOLYSIS AND GLUCONEOGENESIS IN CONSCIOUS OVERNIGHT-FASTED DOGS [J].
CHERRINGTON, AD ;
FUCHS, H ;
STEVENSON, RW ;
WILLIAMS, PE ;
ALBERTI, KGMM ;
STEINER, KE .
AMERICAN JOURNAL OF PHYSIOLOGY, 1984, 247 (02) :E137-E144
[7]  
CHIASSON JL, 1977, FED PROC, V36, P229
[8]  
CLARKE DW, 1984, J BIOL CHEM, V259, P1672
[9]   INSULIN-SENSITIVE GLUCORECEPTORS IN RAT PREOPTIC AREA THAT REGULATE FFA MOBILIZATION [J].
COIMBRA, CC ;
MIGLIORINI, RH .
AMERICAN JOURNAL OF PHYSIOLOGY, 1986, 251 (06) :E703-E706
[10]   INSULIN AND WAY BRAIN HANDLES GLUCOSE [J].
DANIEL, PM ;
LOVE, ER ;
PRATT, OE .
JOURNAL OF NEUROCHEMISTRY, 1975, 25 (04) :471-476