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Liver and Pancreas: Central Regulators of Glucose Homeostasis and Detoxification

Liver: Metabolic Hub

Glucose Homeostasis

  • Glycogenesis: Stores glucose as glycogen (postprandial, insulin-driven).
  • Glycogenolysis: Breaks down glycogen to glucose (fasting, glucagon-driven).
  • Gluconeogenesis: Synthesizes glucose from lactate, glycerol, amino acids (prolonged fasting).

Detoxification

Phase I (CYP450 oxidation/reduction/hydrolysis) and Phase II (conjugation) render lipophilic toxins water-soluble for biliary/renal excretion.

Lipid Metabolism

De novo lipogenesis, β-oxidation, ketone body synthesis, lipoprotein assembly (VLDL, HDL), cholesterol synthesis/conversion to bile acids.

Protein Metabolism

Synthesizes albumin, clotting factors, acute-phase proteins; deaminates amino acids; urea cycle.

Bile Production

600–1000 mL/day; emulsifies fats, enables fat-soluble vitamin absorption, excretory route for bilirubin, cholesterol, drugs.

Storage

Vitamins A, D, B12, K; iron (ferritin); copper; glycogen.

Pancreas: Endocrine and Exocrine Organ

Endocrine (Islets of Langerhans)

  • β-cells: Insulin—lowers blood glucose, promotes storage.
  • α-cells: Glucagon—raises blood glucose, stimulates glycogenolysis/gluconeogenesis.
  • δ-cells: Somatostatin—inhibits insulin/glucagon.
  • PP cells: Pancreatic polypeptide—regulates exocrine secretion.

Exocrine

Acinar cells secrete digestive enzymes (amylase, lipase, proteases) into duodenum. Ductal cells secrete HCO₃⁻-rich fluid neutralizing gastric acid.

Integrated Glucose Regulation

Portal vein delivers absorbed nutrients directly to liver. Insulin:glucagon ratio dictates hepatic glucose output vs. storage. Dysregulation underlies diabetes mellitus.

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