Zusammenfassung
Die Inkretinhormone „glucose-dependent insulinotropic peptide“ (GIP) und „glucagon-like peptide 1“ (GLP-1) werden nach oraler Zufuhr von Nährstoffen von enteroendokrinen Zellen der Darmschleimhaut sezerniert und stimulieren in Abhängigkeit von der Blutzuckerkonzentration die Insulinsekretion. Bei Gesunden sind sie zusammen für etwa 63–74 % des Inkretineffekts verantwortlich, wobei GIP verglichen mit GLP‑1 einen fast doppelt so hohen Anteil hat. Bei Menschen mit Typ-2-Diabetes ist der Inkretineffekt trotz einer insgesamt unveränderten Sekretion beider Hormone reduziert. Bei ihnen ist GIP weitgehend unwirksam, während die Wirksamkeit von GLP‑1 zur Senkung der Blutzuckerkonzentration, Stimulation der Insulin- und Hemmung der Glukagonsekretion deutlich besser erhalten ist. Die Ursachen für diese Unterschiede sind immer noch nicht abschließend geklärt, diskutiert werden eine verminderte Expression des GIP-Rezeptors bei Diabetes mellitus oder ein allgemein reduziertes Ansprechen funktionsgestörter β‑Zellen. Der weitgehende Wirkverlust von GIP beim Typ-2-Diabetes in Kurzzeitexperimenten zur Stimulation der Insulinsekretion ist nicht ohne Weiteres kompatibel mit der besonders hohen Effektivität von GIP-/GLP-1-Rezeptor-Koagonisten wie Tirzepatid in der Therapie des Typ-2-Diabetes, welcher zu einer stärkeren Senkung des HbA1c (Glykohämoglobin) und einer ausgeprägteren Gewichtsreduktion führt, als dies mit selektiven GLP-1-Rezeptor-Agonisten möglich ist. Das wachsende Verständnis der Sekretion und der biologischen Wirksamkeit von Inkretinhormonen im Kontext der pathophysiologischen Veränderungen beim Typ-2-Diabetes wird dazu beitragen, inkretinbasierte Medikamente zur Therapie des Typ-2-Diabetes und der Adipositas weiter zu optimieren.
Abstract
The incretin hormones glucose-dependent insulinotropic peptide (GIP) and glucagon-like peptide‑1 (GLP-1) are secreted by specialized intestinal cells after oral intake of nutrients and, in a glucose-dependent manner, stimulate insulin secretion. In healthy individuals, they contribute about 63–74% to the incretin effect, with GIP playing a larger role than GLP‑1. Despite no overall change in hormone secretion, the incretin effect is diminished, and GIP is largely ineffective in type 2 diabetes, whereas the effects of GLP‑1 remain relatively unchanged. While the reasons for this difference remain to be clarified, alterations in GIP receptor expression or general β‑cell functional defects may provide a potential explanation. The ineffectiveness of GIP contrasts with the prominent effects on glycated hemoglobin (HbA1c) and body weight of GIP/GLP‑1 co-agonists like tirzepatide in type 2 diabetes treatment, as compared to selective GLP‑1 receptor agonists. The growing understanding of the secretion and biological efficacy of incretin hormones will help optimize the effectiveness of incretin-based therapeutics for treating type 2 diabetes and obesity.
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D.R. Quast erhielt eine Forschungsauszeichnung, die von Sanofi gesponsert wurde, sowie Honorare für Vorträge, Präsentationen und Fortbildungsveranstaltungen von Eli Lilly & Co. und Novo Nordisk und Unterstützung für die Teilnahme an Tagungen und/oder Fortbildungen von Eli Lilly & Co. und Cook Medical. M.A. Nauck war oder ist Mitglied in „advisory boards“ oder führte Beratungstätigkeiten für Boehringer Ingelheim, Eli Lilly & Co., Medtronic, Merck, Sharp & Dohme, Novo Nordisk, Pfizer, Regor, Sun Pharma und Structure Therapeutics (ShouTi, Gasherbrum) durch. Er erhielt Fördermittel von Merck, Sharp & Dohme. Darüber hinaus war er im Referentennetzwerk von Eli Lilly & Co., Menarini/Berlin Chemie, Merck, Sharp & Dohme, Medscape, Medical Learning Institute und Novo Nordisk tätig.
Für diesen Beitrag wurden von den Autoren keine Studien an Menschen oder Tieren durchgeführt. Für die aufgeführten Studien gelten die jeweils dort angegebenen ethischen Richtlinien.
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Quast, D.R., Nauck, M.A. Veränderungen der Sekretion und biologischen Wirksamkeit von Inkretinhormonen bei Typ-2-Diabetes. Diabetologie 20, 201–211 (2024). https://doi.org/10.1007/s11428-023-01146-w
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DOI: https://doi.org/10.1007/s11428-023-01146-w
Schlüsselwörter
- Glukosestoffwechselstörungen
- Glukagonähnliches Peptid 1 (GLP-1)
- Rezeptoragonisten des GLP‑1
- Glukoseabhängiges insulinotropes Peptid
- Pathophysiologie