scholarly journals Relationship between adenine nucleotide metabolism and irreversible ischemic tissue damage in isolated perfused rat heart.

1979 ◽  
Vol 45 (2) ◽  
pp. 218-225 ◽  
Author(s):  
T C Vary ◽  
E T Angelakos ◽  
S W Schaffer
Keyword(s):  
Tissue Damage ◽  
Rat Heart ◽  
Adenine Nucleotide ◽  
Nucleotide Metabolism ◽  
Perfused Rat Heart ◽  
Isolated Perfused Rat Heart ◽  
Adenine Nucleotide Metabolism ◽  
Ischemic Tissue

scholarly journals Adenine nucleotide metabolism and compartmentalization in isolated adult rat heart cells.

1984 ◽  
Vol 54 (5) ◽  
pp. 536-546 ◽  
Author(s):  
T Geisbuhler ◽  
R A Altschuld ◽  
R W Trewyn ◽  
A Z Ansel ◽  
K Lamka ◽  
...  
Keyword(s):  
Rat Heart ◽  
Adenine Nucleotide ◽  
Nucleotide Metabolism ◽  
Heart Cells ◽  
Adult Rat ◽  
Adenine Nucleotide Metabolism ◽  
Rat Heart Cells

Calcium antagonists and adenine nucleotide metabolism in rat heart

1986 ◽  
Vol 20 (8) ◽  
pp. 604-608 ◽  
Author(s):  
S. V NIGDIKAR ◽  
J. BOWDITCH ◽  
J. W DOW
Keyword(s):  
Calcium Antagonists ◽  
Rat Heart ◽  
Adenine Nucleotide ◽  
Nucleotide Metabolism ◽  
Adenine Nucleotide Metabolism

Adenine nucleotide synthesis from inosine during normoxia and after ischaemia in the isolated perfused rat heart

1985 ◽  
Vol 63 (9) ◽  
pp. 1159-1164 ◽  
Author(s):  
J. Aussedat ◽  
M. Verdys ◽  
A. Rossi
Keyword(s):  
Rat Heart ◽  
Adenine Nucleotide ◽  
Adenine Nucleotides ◽  
Low Flow ◽  
Nucleotide Synthesis ◽  
Perfused Rat Heart ◽  
Isolated Perfused Rat Heart ◽  
Nucleotide Content ◽  
Glycogen Stores

[14C]inosine in a range of concentrations of 20 μM to 1 mM was administered-to the isolated perfused rat heart for 30 min. The incorporation of the nucleoside into myocardial adenine nucleotides increased for extracellular concentrations of the precursor up to 50 μM, reaching a plateau at 60 nmol∙g−1∙30 min−1 with concentrations ranging between 50 and 200 μM. The supply of 500 μM and 1 mM of inosine induced a further increase in cardiac adenine nucleotide synthesis to about 200 nmol∙g−1∙30 min−1. When supplied during low flow ischaemia (0.5 mL∙min−1, 30 min.), 1 mM of inosine protected the heart against ATP degradation, while 100 μM of inosine was inefficacious. In the presence of 1 mM of inosine on reperfusion the adenine nucleotide content of the heart was similar to that observed in the absence of the nucleoside. The incorporation of [14C]inosine into adenine nucleotides was, in this last condition, below the value measured before ischaemia. Inosine administration was effective in protecting the heart against ischaemic breakdown of glycogen and favoured postischaemic restoration of glycogen stores.

The Platelet of the Newborn Infant – Adenine Nucleotide Metabolism and Release

1980 ◽  
Vol 43 (02) ◽  
pp. 099-103 ◽  
Author(s):  
J M Whaun ◽  
P Lievaart ◽  
Keyword(s):  
Newborn Infant ◽  
Adenine Nucleotide ◽  
Platelet Rich Plasma ◽  
Adenine Nucleotides ◽  
Newborn Infants ◽  
Specific Radioactivity ◽  
Nucleotide Metabolism ◽  
Breakdown Product ◽  
Term Infants ◽  
Adenine Nucleotide Metabolism

SummaryBlood from normal full term infants, mothers and normal adults was collected in citrate. Citrated platelet-rich plasma was prelabelled with 3H-adenine and reacted with release inducers, collagen and adrenaline. Adenine nucleotide metabolism, total adenine nucleotide levels and changes in sizes of these pools were determined in platelets from these three groups of subjects.At rest, the platelet of the newborn infant, compared to that of the mother and normal adult, possessed similar amounts of adenosine triphosphate (ATP), 4.6 ± 0.2 (SD), 5.0 ± 1.1, 4.9 ± 0.6 µmoles ATP/1011 platelets respectively, and adenosine diphosphate (ADP), 2.4 ± 0.7, 2.8 ± 0.6, 3.0 ± 0.3 umoles ADP/1011 platelets respectively. However the marked elevation of specific radioactivity of ADP and ATP in these resting platelets indicated the platelet of the neonate has decreased adenine nucleotide stores.In addition to these decreased stores of adenine nucleotides, infant platelets showed significantly impaired release of ADP and ATP on exposure to collagen. The release of ADP in infants, mothers, and other adults was 0.9 ± 0.5 (SD), 1.5 ± 0.5, 1.5 ± 0.1 umoles/1011 platelets respectively; that of ATP was 0.6 ± 0.3, 1.0 ± 0.1,1.3 ± 0.2 µmoles/1011 platelets respectively. With collagen-induced release, platelets of newborn infants compared to those of other subjects showed only slight increased specific radioactivities of adenine nucleotides over basal levels. The content of metabolic hypoxanthine, a breakdown product of adenine nucleotides, increased in both platelets and plasma in all subjects studied.In contrast, with adrenaline as release inducer, the platelets of the newborn infant showed no adenine nucleotide release, no change in total ATP and level of radioactive hypoxanthine, and minimal change in total ADP. The reason for this decreased adrenaline reactivity of infant platelets compared to reactivity of adult platelets is unknown.Infant platelets may have different membranes, with resulting differences in regulation of cellular processes, or alternatively, may be refractory to catecholamines because of elevated levels of circulating catecholamines in the newborn period.

scholarly journals L-Arginine Intake Effect on Adenine Nucleotide Metabolism in Rat Parenchymal and Reproductive Tissues

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
G. Kocic ◽  
J. Nikolic ◽  
T. Jevtovic-Stoimenov ◽  
D. Sokolovic ◽  
H. Kocic ◽  
...  
Keyword(s):  
Adenosine Deaminase ◽  
Adenine Nucleotide ◽  
Adenine Nucleotides ◽  
Tissue Growth ◽  
Nucleotide Metabolism ◽  
Amp Deaminase ◽  
Male Impotence ◽  
Adenine Nucleotide Metabolism ◽  
Adenosine Concentration ◽  
Male Wistar Rats

L-arginine is conditionally essetcial amino acid, required for normal cell growth, protein synthesis, ammonia detoxification, tissue growth and general performance, proposed in the treatment of men sterility and prevention of male impotence. The aim of the present paper was to estimate the activity of the enzymes of adenine nucleotide metabolism:5′-nucleotidase (5′-NU), adenosine deaminase (ADA), AMP deaminase, and xanthine oxidase (XO), during dietary intake of L-arginine for a period of four weeks of male Wistar rats. Adenosine concentration in tissues is maintained by the relative activities of the adenosine-producing enzyme,5′-NU and the adenosine-degrading enzyme-ADA adenosine deaminase. Dietary L-arginine intake directed adenine nucleotide metabolism in liver, kidney, and testis tissue toward the activation of adenosine production, by increased5′-NU activity and decreased ADA activity. Stimulation of adenosine accumulation could be of importance in mediating arginine antiatherosclerotic, vasoactive, immunomodulatory, and antioxidant effects. Assuming that the XO activity reflects the rate of purine catabolism in the cell, while the activity of AMP deaminase is of importance in ATP regeneration, reduced activity of XO, together with the increased AMP-deaminase activity, may suggest that adenine nucleotides are presumably directed to the ATP regenerating process during dietary L-arginine intake.

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