1
|
GAITONDE MK, MARCHI SA, RICHTER D. The utilization of glucose in the brain and other organs of the cat. ACTA ACUST UNITED AC 1997; 160:124-36. [PMID: 14142165 DOI: 10.1098/rspb.1964.0031] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
After subcutaneous injection of [
14
C]glucose in the cat the total
14
C content per gram fresh tissue was relatively high in liver, kidney, blood and brain: lower values were obtained in heart, spleen, lung, skeletal mucle and spinal cord. In all organs examined more than 95 % of the radioactivity present at 22 min after injection was contained in the acid-soluble fraction of the tissue: proteins, lipids and nucleic acids together accounted for only 0.2 to 5 % of the radioactivity. In most organs the
14
C in the acid-soluble fraction was present mainly as [
14
C]glucose, but in nervous tissues a large part (48 to 74 %) of the
14
C was contained in the free amino acid fraction. The incorporation of
14
C from [
14
C]glucose into amino acids (counts min
-1
g fresh tissue
-1
)
in vivo
was highest in the cerebral cortex and decreased in the order cerebral cortex > cerebellum > pons and medulla > spinal cord: the incorporation into amino acids was several times greater in the brain than in other organs examined. Values obtained for the heart were intermediate between those for brain and other organs. About 80 % of the
14
C incorporated into amino acids of the cerebral cortex was combined in glutamic and aspartic acids. In liver, spleen, muscle, lung and blood the basic and neutral amino acids accounted for a relatively larger proportion of the radioactivity of the amino acid fraction. The
14
C contained in tricarboxylic acid cycle intermediates accounted for 20 to 32 % of the radioactivity of the acid-soluble fraction in different parts of the brain.
Collapse
|