Serum gastrin in chronic renal failure: morphological and physiological correlations

Area of Science:

• Nephrology
• Gastroenterology
• Endocrinology

Background:

• Elevated serum gastrin (SG) is observed in chronic renal failure (CRF).
• The relationship between SG and humoral/histopathologic factors in CRF is not fully understood.

Purpose of the Study:

• To investigate serum gastrin levels in relation to various humoral factors and gastroduodenal histopathology in patients with chronic renal failure.
• To explore the correlation between SG and parameters like parathyroid hormone (PTH), creatinine, and gastroduodenal findings.

Main Methods:

• Studied SG, PTH, BUN, creatinine, Ca++, PO4---, and alkaline phosphatase in controls, conservative therapy (CT), regular dialysis (RDT), and transplant (Tx) patients.
• Performed pentagastrin (PG) stimulation tests and upper gastrointestinal endoscopy with mucosal biopsies.
• Analyzed mucosal staining for MPS, NA, and AP, and correlated findings with SG levels.

Main Results:

• Mean SG levels were significantly higher in CT, RDT, and Tx groups compared to controls.
• SG showed a linear correlation with serum creatinine in CT and RDT patients.
• Gastroduodenal erosions negatively correlated with SG and were more frequent with normal MPS and NA staining. Acid response to PG was inversely correlated with SG.

Conclusions:

• Elevated serum gastrin in CRF is likely compensatory for a decreased gastroduodenal response to pentagastrin.
• Simple retention of SG does not fully explain its elevation; kidney function (creatinine) plays a role.
• Histopathological findings, particularly mucosal staining, are associated with SG levels and gastroduodenal integrity in CRF.