Regulation of peripheral plasma somatostatin like immunoreactivity in type I diabetes: role of the degree of metabolic control.
We have determined peripheral venous somatostatin like immunoreactivity (SLI) levels in 11 normal subjects (blood glucose--BG--: 4.4 +/- 0.1 mM; ketone bodies--KB--: 90 +/- 12 microM; plasma free fatty acids--FFA --: 340 +/- 42 microM), 4 Biostator controlled insulin dependent diabetics (BG: 5.4 +/- 0.2 mM; FFA: 418 +/- 38 microM; KB: 226 +/- 41 microM) and 7 poorly controlled ketotic diabetics (BG: 10.8 +/- 1.3 mM; FFA: 915 +/- 19 microM; KB: 2490 +/- 576 microM). SLI was determined again after 48 to 96 hours of intravenous insulin infusion for the 7 ketotic diabetics and after transient interruption of insulin infusion for the Biostator controlled diabetics. Relative to normal subjects ketotic diabetics had elevated SLI levels (29.7 +/- 5.9 vs 13.5 +/- 1.8 ng/L, p less than 0.01) whereas biostator-controlled patient had near to normal values (20.4 +/- 6.4 ng/L, p greater than 0.30). Transient arrest of insulin infusion in the Biostator controlled diabetics resulted only in a mild metabolic deterioration (BG: 12.8 +/- 2.1 mM; FFA: 640 +/- 146 microM; KB: 950 +/- 163 microM) without a significant rise of SLI. Intravenous insulin infusion in the initially ketotic patients decreased BG and KB in each subject (p less than 0.01) but decreased FFA (1097 +/- 170 to 453 +/- 74 microM, p less than 0.05) and SLI (34.0 +/- 12.0 to 9.8 +/- 2.4 ng/L, p less than 0.05) only in 4 patients whereas both FFA (737 +/- 107 to 725 +/- 25 microM) and SLI (27.6 +/- 4.7 to 20.3 +/- 4.7 ng/L) levels remained stable in the other 3. These results suggest that SLI levels in type I diabetics are dependent the degree of metabolic control and could be related to the variations of FFA concentrations.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001786:Blood Glucose / Q000378:metabolism; D003922:Diabetes Mellitus, Type 1 / Q000097:blood* / Q000188:drug therapy; D004334:Drug Administration Schedule; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D004763:Glucagon-Like Peptides; D006801:Humans; D007328:Insulin / Q000097:blood / Q000627:therapeutic use; D061389:Insulin, Regular, Pork; D007657:Ketone Bodies / Q000097:blood; D008297:Male; D008875:Middle Aged; D010455:Peptides / Q000097:blood*
D001786:Blood Glucose; D005230:Fatty Acids, Nonesterified; D007328:Insulin; D061389:Insulin, Regular, Pork; D007657:Ketone Bodies; D010455:Peptides; C029993:somatostatin-like peptides; D004763:Glucagon-Like Peptides; C015236:glucagon-like-immunoreactivity; C000006:insulin, neutral