Altered response in renal blood flow and oxygen tension to contrast media in diabetic rats.
OBJECTIVE
To investigate the effect of the contrast medium (CM) iopromide on renal microcirculation and oxygen tension in non-diabetic control and streptozotocin-diabetic Wistar Furth rats.


METHODS
Oxygen tension was measured with Clark-type microelectrodes and blood flow with laser-Doppler flow probes. In order to differentiate between an acutely increased blood glucose concentration and a long-term diabetic state, some of the non-diabetic control rats were intravenously infused with glucose.


RESULTS
CM decreased the medullary oxygen tension in control (non-diabetic normoglycemic) rats ( approximately 35%) but not in diabetic rats. Medullary blood flow in control rats increased after CM administration and remained elevated, while it was unchanged in the diabetic rats. In response to CM, glucose-infused control rats responded similarly to control animals in medullary oxygen tension, but similarly to diabetic rats in medullary blood flow. Contrary to in control rats, medullary oxygen tension was unchanged in diabetic animals after CM administration.


CONCLUSIONS
Streptozotocin-diabetic rats have an altered response to intravenous injection of the CM iopromide compared to non-diabetic rats. The unaltered medullary oxygen tension, seen in the diabetic group after injection of CM, suggests that non-hemodynamic mechanisms are responsible for the increased frequency of renal failure commonly seen among diabetic patients.
Palm
F
F
Department of Medical Cell Biology, Uppsala University, Sweden. Fredrik.Palm@medcellbiol.uu.se
Carlsson
P-O
PO
Hansell
P
P
Hellberg
O
O
Nygren
A
A
Liss
P
P
D000818:Animals; D003287:Contrast Media / Q000494:pharmacology* / Q000633:toxicity; D003921:Diabetes Mellitus, Experimental / Q000503:physiopathology*; D007472:Iohexol / Q000031:analogs & derivatives* / Q000494:pharmacology* / Q000633:toxicity; D007679:Kidney Medulla / Q000187:drug effects; D008297:Male; D010100:Oxygen / Q000378:metabolism*; D051381:Rats; D011920:Rats, Inbred WF; D012079:Renal Circulation; D013997:Time Factors
D003287:Contrast Media; D007472:Iohexol; C038192:iopromide; D010100:Oxygen