Purine nucleotides and their metabolites in erythrocytes of streptozotocin diabetic rats.
OBJECTIVE
In the present study it was tried to obtain a complete overview of purine nucleotide metabolism in erythrocytes of streptozotocin (STZ) induced diabetes mellitus rats.


METHODS
Erythrocyte levels of the main nucleotides (ATP, ADP, AMP, GTP, GDP, GMP, IMP, NAD+, NADP+), nucleosides (Ado, Guo, Ino) and the base Hyp were measured using the HPLC method. The parameters that can be deduced from their concentrations: TAN, TGN and AEC, GEC expressed by the ratio of high/low energy nucleoside phosphates were calculated. The effects of streptozotocin-induced diabetes on the concentration and metabolism of rat erythrocyte purine and pyridine nucleotides and the activity of Na+, K+-ATPase as well as Ca2+-ATPase were investigated.


RESULTS
Increased dephosphorylation of adenine nucleotides (found as the increased concentration of Ado and Hyp and the decrease in AEC value) and the decrease in ATP and TAN and the changes in the concentrations of NAD+ and NADP+ suggest serious purine and pyridine metabolism disruptions in diabetic erythrocytes and decrease in ATPases activity.


CONCLUSIONS
The observations suggest that purine nucleotide degradation is markedly accelerated in erythrocytes of STZ diabetic rats.
Dudzinska
W
W
Department of Biochemistry, Faculty of Natural Sciences, University of Szczecin, 3a Felczaka, 71-412 Szczecin, Poland. wiola@univ.szczecin.pl
Hlynczak
A J
AJ
D000227:Adenine Nucleotides / Q000097:blood; D000251:Adenosine Triphosphatases / Q000097:blood; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D003921:Diabetes Mellitus, Experimental / Q000097:blood*; D004912:Erythrocytes / Q000378:metabolism*; D006150:Guanine Nucleotides / Q000097:blood; D007291:Inosine Monophosphate / Q000097:blood; D008297:Male; D009243:NAD / Q000097:blood; D009249:NADP / Q000031:analogs & derivatives* / Q000097:blood; D011685:Purine Nucleotides / Q000097:blood*; D051381:Rats; D017208:Rats, Wistar
D000227:Adenine Nucleotides; D006150:Guanine Nucleotides; D011685:Purine Nucleotides; D009243:NAD; D007291:Inosine Monophosphate; D009249:NADP; C024376:NAADP; D000251:Adenosine Triphosphatases