Pancreatic Hormone Replacement – Insulin & Glucagon
Pancreatic hormone replacement refers to the medical administration of hormones that the pancreas can no longer produce sufficiently – primarily insulin and glucagon.
Things worth knowing about "Pancreatic Hormone Replacement"
Pancreatic hormone replacement refers to the medical administration of hormones that the pancreas can no longer produce sufficiently – primarily insulin and glucagon.
What is Pancreatic Hormone Replacement?
Pancreatic hormone replacement encompasses all therapeutic measures in which hormones of the pancreas are supplied externally because the gland can no longer produce them in adequate amounts. The most important pancreatic hormones are insulin, glucagon, and somatostatin. The most common form is insulin replacement therapy, which is required in people with type 1 diabetes mellitus and advanced type 2 diabetes.
Functions of Pancreatic Hormones
The pancreas produces several hormones in its islets of Langerhans that regulate blood glucose levels:
- Insulin (beta cells): lowers blood glucose by promoting the uptake of glucose into body cells.
- Glucagon (alpha cells): raises blood glucose by stimulating glucose release from the liver.
- Somatostatin (delta cells): inhibits the secretion of insulin and glucagon and regulates digestion.
If the production of these hormones fails or becomes insufficient, serious metabolic disorders occur.
Causes Requiring Pancreatic Hormone Replacement
Pancreatic hormone replacement becomes necessary when the pancreas loses all or part of its endocrine function. Common causes include:
- Type 1 diabetes mellitus: autoimmune destruction of insulin-producing beta cells
- Advanced type 2 diabetes mellitus: progressive exhaustion of beta cell function
- Pancreatectomy: surgical removal of the pancreas (e.g., due to pancreatic cancer or chronic pancreatitis)
- Chronic pancreatitis: long-term inflammation leading to progressive destruction of glandular tissue
- Pancreatogenic diabetes (type 3c): diabetes resulting from pancreatic disease
Forms of Pancreatic Hormone Replacement
Insulin Replacement Therapy
Insulin replacement therapy is the most common form of pancreatic hormone replacement. Several insulin preparations are available, differing in their duration of action:
- Short-acting insulins (e.g., regular insulin, rapid-acting insulin analogues): administered at mealtimes.
- Long-acting insulins (basal insulins): cover the baseline insulin requirement over 12 to 24 hours.
- Premixed insulins: combinations of short- and long-acting insulins.
Insulin is typically administered by subcutaneous injection using an insulin pen or syringe, or alternatively via an insulin pump (continuous subcutaneous insulin infusion, CSII).
Glucagon Replacement
Glucagon is used to treat severe hypoglycaemia (low blood sugar) in situations where the patient can no longer take glucose orally. It is available as an emergency medication in the form of pre-filled syringes or nasal sprays.
Somatostatin Analogues
Synthetic somatostatin analogues (e.g., octreotide, lanreotide) are used in certain hormone-secreting tumours of the pancreas (insulinoma, glucagonoma) and in acromegaly to suppress excessive hormone secretion.
Application and Dosage
The dosage of pancreatic hormone replacement – particularly insulin – is individual and depends on:
- Current blood glucose values (measured by blood glucose meters or continuous glucose monitoring, CGM)
- Carbohydrate intake at meals
- Physical activity
- Comorbidities and concomitant medications
Modern therapy systems such as the closed-loop system (also known as the artificial pancreas) combine continuous glucose monitoring with automated insulin delivery, enabling more precise blood glucose regulation.
Side Effects and Risks
Pancreatic hormone replacement may be associated with the following risks:
- Hypoglycaemia: excessive insulin leads to a dangerous drop in blood glucose levels.
- Lipodystrophy: changes in subcutaneous fatty tissue at injection sites.
- Weight gain: particularly with intensified insulin therapy.
- Allergic reactions: rare but possible with certain insulin preparations.
Significance and Future Outlook
Pancreatic hormone replacement is life-saving for many individuals and enables a largely normal life despite impaired pancreatic function. Research is actively exploring innovative approaches such as islet cell transplantation, the development of oral insulin formulations, and the further optimisation of closed-loop systems to improve the quality of life of those affected.
References
- World Health Organization (WHO): Global Report on Diabetes. Geneva, 2016. Available at: https://www.who.int/publications/i/item/9789241565257
- American Diabetes Association: Standards of Medical Care in Diabetes 2024. Diabetes Care, Vol. 47, Supplement 1, 2024. Available at: https://diabetesjournals.org/care/issue/47/Supplement_1
- Kasper DL et al.: Harrison's Principles of Internal Medicine. 20th edition. McGraw-Hill Education, 2018.
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