Serotonin metabolism in patients undergoing hemodialysis.
To determine the pathogenic role of serotonin (5-HT), we investigated 5-HT metabolism in undergoing hemodialysis (HD). Mean value of platelet 5-HT in patients undergoing HD was significantly lower than that of normal controls (0.22 + or - 0.16 pmol/10(5) platelets versus 0.35 + or - 0.13 pmol/10(5) platelets, p <0.02). While platelet uptake of 5-HT in normal controls reached a plateau in each experiment after incubation with authentic 5-HT for 60 min, platelet uptake of 5-HT in patients undergoing HD reached various levels. We found significantly lower platelet 5-HT levels in patients with diabetes mellitus (DM) after HD compared with those in patients with chronic glomerulonephritis (p <0.05). The pathogenic role of serotonergic amplifying mechanism especially in patients with DM should be investigated. Second, we investigated plasma 11-dehydro-thromboxane B2 (11-DTXB2) levels in patients undergoing HD. Mean level of plasma 11-DTXB2 concentration in patients after HD was significantly higher than in patients before HD (32.8 + or - 17.0 pg/ml versus 23.7 + or - 7.2 pg/ml, p <0.02). Increased plasma levels of 11-DTXB2 after HD were regarded as an indication of hypercoagulation. Our results provide evidence that several factors such as hypercoagulation, heparin, 5-HT uptake of platelet, or causal diseases of renal failure could be responsible for the lower platelet 5-HT levels in patients undergoing HD.
Kanai
H
H
The Third Department of Internal Medicine, Gunma University School of Medicine, Maebashi, Japan.
Ishii
Y
Y
Maezawa
A
A
Yano
S
S
Naruse
T
T
D000328:Adult; D000368:Aged; D001792:Blood Platelets / Q000378:metabolism*; D016022:Case-Control Studies; D002851:Chromatography, High Pressure Liquid; D003928:Diabetic Nephropathies / Q000150:complications / Q000378:metabolism; D005260:Female; D005921:Glomerulonephritis / Q000150:complications / Q000378:metabolism; D006801:Humans; D007676:Kidney Failure, Chronic / Q000209:etiology / Q000378:metabolism* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D006435:Renal Dialysis; D012701:Serotonin / Q000097:blood / Q000378:metabolism*; D013929:Thromboxane B2 / Q000031:analogs & derivatives / Q000097:blood
D012701:Serotonin; D013929:Thromboxane B2; C049235:11-dehydro-thromboxane B2