Linked Life Data

2642436

Source:http://linkedlifedata.com/resource/pubmed/id/2642436

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1989-2-7
pubmed:abstractText
The role of the brain in directing counterregulation during hypoglycemia induced by insulin infusion was assessed in overnight-fasted conscious dogs. Concomitant brain and peripheral hypoglycemia was induced in one group of dogs (n = 5) by infusing insulin peripherally at a rate of 3.5 mU.kg-1.min-1. In another group (n = 4), insulin was infused as described above to induce peripheral hypoglycemia, and brain hypoglycemia was minimized by infusing glucose bilaterally into the carotid and vertebral arteries to maintain the brain glucose level at a calculated concentration of 85 mg/dl. Glucose was also infused peripherally as needed so that the peripheral glucose levels in both of the protocols were similar (45 +/- 2 mg/dl with and 48 +/- 3 mg/dl without brain glucose infusion, both P less than .05). The responses (in terms of change of area under the curve) of epinephrine, norepinephrine, cortisol, and pancreatic polypeptide when brain glycemia was controlled during insulin infusion were only 14 +/- 6, 39 +/- 12, 17 +/- 8, and 9 +/- 4%, respectively, of those present during insulin infusion without concomitant brain glucose infusion (all P less than .05). Of particular interest was the glucagon response that occurred when head hypoglycemia was minimized; the glucagon level was only 21 +/- 8% of that present when marked brain hypoglycemia accompanied insulin infusion (P less than .05). During hypoglycemia resulting from insulin infusion, endogenous glucose production (EGP), as assessed with [3-3H]glucose, rose from 2.6 +/- 0.1 to 4.4 +/- 0.5 mg.kg-1.min-1 (P less than .05). In contrast, EGP decreased from 2.7 +/- 0.2 to 2.0 +/- 0.3 mg.kg-1.min-1 when brain hypoglycemia was minimized. In an additional set of studies, when insulin was infused at 3.5 mU.kg-1.min-1 and glucose was infused peripherally to maintain both the head and peripheral glucose concentrations at 88 +/- 6 mg/dl, EGP decreased from 2.6 +/- 0.1 to 1.2 +/- 0.2 mg.kg-1.min-1. These results suggest that under marked hyperinsulinemic conditions the brain is the primary director of glucagon release and that it is responsible for approximately 75% of the life-sustaining glucose production.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0012-1797
pubmed:author
pubmed:issnType
Print
pubmed:volume
38
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
7-16
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Role of brain in counterregulation of insulin-induced hypoglycemia in dogs.
pubmed:affiliation
Department of Molecular Physiology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.