Serum immunoreactive trypsin in tropical pancreatic diabetes syndrome.
Fifteen patients with tropical pancreatic diabetes syndrome (TPDS), 16 insulin-dependent diabetics (IDD), 27 non-insulin-dependent diabetics (NIDD) and 14 normal subjects, all from India, were investigated for markers of beta-cell (C-peptide) and exocrine (immunoreactive trypsin; IRT) reserve. IRT and C-peptide concentrations were the lowest in TPDS, lower than normal in IDD, and not significantly different from normal in NIDDs. There was a highly significant correlation (rs = 0.93; P less than 0.0001) between IRT and C-peptide (measured in 50% of patients and controls) concentrations when all diabetic groups were combined. Such a correlation was absent when TPDS patients were considered in isolation, largely because of the markedly low IRT concentration. Fourteen of 15 patients (93%) with TPDS had subnormal IRT concentrations, of which 11 had IRT values of less than 50 micrograms/L. These IRT values are similar to those previously reported in cystic fibrosis. Only 6 of 16 IDDs (38%) had subnormal IRT concentrations, of which only one was below 50 micrograms/L. These data suggest that exocrine pancreatic reserve is markedly diminished in TPDS and that a subnormal IRT concentration may be a useful biochemical marker for this form of diabetes.
Yajnik
C S
CS
Department of Chemical Pathology and Human Metabolism, Royal Free Hospital and School of Medicine, London, UK.
Katrak
A
A
Kanitkar
S V
SV
Naik
S S
SS
D'Souza
V
V
Dandona
P
P
D000293:Adolescent; D000328:Adult; D015415:Biomarkers / Q000097:blood; D002096:C-Peptide / Q000097:blood; D002137:Calculi / Q000097:blood* / Q000150:complications / Q000175:diagnosis; D002648:Child; D003922:Diabetes Mellitus, Type 1 / Q000097:blood* / Q000175:diagnosis / Q000209:etiology; D003924:Diabetes Mellitus, Type 2 / Q000097:blood* / Q000175:diagnosis / Q000209:etiology; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D008875:Middle Aged; D010182:Pancreatic Diseases / Q000097:blood* / Q000150:complications; D014329:Tropical Climate; D014357:Trypsin / Q000097:blood*
D015415:Biomarkers; D002096:C-Peptide; D014357:Trypsin