Immunoreactive somatostatin in human pancreatic secretion

Area of Science:

• Endocrinology
• Gastroenterology
• Metabolic Research

Background:

• Somatostatin plays a crucial role in regulating various physiological processes, including pancreatic exocrine secretion.
• Alterations in somatostatin levels have been implicated in the pathophysiology of diabetes mellitus.

Purpose of the Study:

• To quantify and characterize somatostatin levels in human pancreatic juice.
• To investigate potential differences in somatostatin levels between non-diabetic individuals and those with non-insulin-dependent diabetes.

Main Methods:

• Human pancreatic juice was collected during endoscopic retrograde cholangiopancreatography after secretin stimulation.
• Radioimmunoassay (RIA) was employed to determine immunoreactive somatostatin (IRS) levels.
• Size-exclusion chromatography was used to analyze the molecular components of IRS.

Main Results:

• Mean IRS levels in non-diabetics were 78 pg/ml.
• Mean IRS levels in non-insulin-dependent diabetics were significantly higher, averaging 1559 pg/ml.
• IRS in pancreatic juice was immunologically similar to somatostatin14 and comprised two major components, one being somatostatin14 and another of approximately 3000 daltons.

Conclusions:

• Pancreatic juice somatostatin levels are markedly elevated in non-insulin-dependent diabetics.
• The findings suggest a potential role for altered pancreatic somatostatin in diabetes.
• Further research is warranted to elucidate the functional significance of these somatostatin components.