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Endogenous GIP Signaling Is Essential for DPP-4 Inhibitor Drug Effects

RPEP-154622026Kubota-Okamoto, Saki; Kubota, Sodai; Tsuchida, Hiromi; Liu, Yanyan; Banno, Seiya; Imaizumi, Toshinori; Fujisawa, Taro; Takahashi, Yoshihiro; Kato, Takehiro; Horikawa, Yukio; Iizuka, Katsumi; Murakami, Takaaki; Fujiwara, Yuuka; Kuwata, Hitoshi; Yamazaki, Yuji; Seino, Yutaka; Tsunekawa, Shin; Yabe, Daisuke
evidence
The takeaway

Endogenous GIP signaling is indispensable for DPP-4 inhibitor-mediated metabolic improvements, revealing that DPP-4 drugs work primarily through preserving GIP rather than GLP-1.

GIP drives DPP-4i effects

DPP-4 inhibitors were thought to work by preserving GLP-1, but this study proves they primarily work through GIP — a fundamental mechanistic revision

What the researchers found

Endogenous GIP signaling is required for DPP-4 inhibitor metabolic effects, demonstrating DPP-4 drugs work primarily through GIP preservation rather than GLP-1 preservation.

Why it matters

Understanding that DPP-4 drugs work through GIP explains their different clinical profile from GLP-1 drugs and informs combination therapy design.

How the study worked

Study using GIP signaling blockade to determine the relative contribution of GIP vs GLP-1 to DPP-4 inhibitor effects.

What this study cannot tell us

Specific model and methods in full paper.

How to read the evidence

Mechanistic study with signaling blockade.

When this study was published

Published in 2025.

The bigger picture

DPP-4 inhibitors and GLP-1 RA drugs work through different primary hormones — GIP and GLP-1 respectively — explaining their different clinical effectiveness.

Questions still open

  • Should DPP-4i be called "GIP-preserving" rather than "incretin-preserving" drugs?
  • Does this explain DPP-4i's lack of cardiovascular benefit (GIP vs GLP-1)?
  • Would GIP+GLP-1 dual preservation explain tirzepatide's superiority?

Common questions

Do DPP-4 inhibitors work through GLP-1?
Surprisingly, this study proves they primarily work through GIP, not GLP-1. This explains why they have different effects from GLP-1 drugs like semaglutide.
Why does this matter?
It explains why DPP-4 drugs don't provide the cardiovascular benefits that GLP-1 drugs do — they work through a different hormone with different tissue effects.

Read the original research

Endogenous GIP signaling is indispensable for DPP-4 inhibitor-mediated metabolic control in mice.

Journal of diabetes investigation

View on PubMed ↗Publisher’s paper ↗

Citation

Kubota-Okamoto, Saki; Kubota, Sodai; Tsuchida, Hiromi; Liu, Yanyan; Banno, Seiya; Imaizumi, Toshinori; Fujisawa, Taro; Takahashi, Yoshihiro; Kato, Takehiro; Horikawa, Yukio; Iizuka, Katsumi; Murakami, Takaaki; Fujiwara, Yuuka; Kuwata, Hitoshi; Yamazaki, Yuji; Seino, Yutaka; Tsunekawa, Shin; Yabe, Daisuke. (2026). Endogenous GIP signaling is indispensable for DPP-4 inhibitor-mediated metabolic control in mice.. Journal of diabetes investigation. https://doi.org/10.1111/jdi.70252