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Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a...
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Investigating Intestinal Inflammation in DSS-induced Model of IBD
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DPP4 inhibition curbs systemic inflammation.

Katharina E M Hellenthal1, Sebastian Kintrup1, Timo Wirth2

  • 1Department of Anesthesiology, Intensive Care and Pain Medicine, University Hospital Muenster, Muenster, Germany.

Critical Care (London, England)
|August 15, 2025
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Summary
This summary is machine-generated.

Dipeptidyl peptidase-4 (DPP4) inhibition, using sitagliptin, preserves vascular integrity and protects organs during systemic inflammation from surgery or infection. This approach safely curbs immune responses, improving patient outcomes.

Keywords:
Capillary leakageCardiac surgeryDPP4 inhibitorInflammationVasculature

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Area of Science:

  • Immunology
  • Vascular Biology
  • Pharmacology

Background:

  • Systemic inflammation, often from surgery or infection, causes widespread vascular dysfunction and organ damage.
  • Dipeptidyl peptidase-4 (DPP4) plays a key role in modulating inflammatory responses.
  • Understanding DPP4's role is crucial for managing inflammatory conditions.

Purpose of the Study:

  • To investigate if DPP4 inhibition can beneficially modulate systemic inflammation.
  • To assess the impact of DPP4 inhibition on vascular and organ integrity.
  • To evaluate DPP4 inhibition's effects in both human patients and animal models.

Main Methods:

  • A systems biology approach was used in cardiac surgery patients treated with DPP4 inhibitors versus controls.
  • Macro- and microvascular dynamics and perioperative immune responses were analyzed.
  • Mechanistic studies in mice with sepsis evaluated DPP4 inhibition's effects on immune responses, capillary leakage, and endothelial function.

Main Results:

  • Sitagliptin intake in patients was linked to improved microvascular integrity, reduced vasoplegia, and less capillary leakage.
  • In mice, DPP4 inhibition reduced inflammatory responses to sepsis, preserving vascular barrier function and organ integrity.
  • DPP4 inhibition also improved vasopressor responses and endothelial gene activation profiles in mice.

Conclusions:

  • DPP4 inhibition is a safe and effective strategy to mitigate immune responses to surgery or infection.
  • Preserving vascular integrity through DPP4 inhibition leads to organ protection.
  • This approach holds promise for improving clinical outcomes in patients with systemic inflammation.