DPP‑4: A Multifunctional Molecular Hub at the Frontier of Cross‑Disciplinary Life Science Research

Introduction

Dipeptidyl peptidase‑4 (DPP‑4, also known as CD26) has evolved far beyond its classical role as a diabetes‑associated enzyme. Positioned at the crossroads of metabolism, immunology, neuroscience, and oncology, DPP‑4 acts as a critical molecular switch that modulates substrate cleavage, immune homeostasis, inflammatory signaling, and tumor progression. This multifunctional profile has made DPP‑4 one of the most dynamic and fundable research directions supported by the National Natural Science Foundation of China (NSFC). For researchers pursuing mechanistic innovation and translational impact, DPP‑4 represents a high‑value target with untapped potential across disease areas.

Core Concepts & Research Frontiers

DPP‑4 is a moonlighting protein with dual enzymatic and non‑enzymatic functions. It is highly expressed in the intestine, immune cells, brain, and tumor microenvironment. Its canonical role is the inactivation of glucagon‑like peptide‑1 (GLP‑1) and glucose‑dependent insulinotropic polypeptide (GIP), establishing its clinical role in glycemic control. However, modern studies reveal that DPP‑4 also cleaves chemokines, neuropeptides, and immune mediators, positioning it as a universal regulator of intercellular communication.

1. DPP‑4 as an Immunological Regulator

Initially identified as the T‑cell activation marker CD26, DPP‑4 modulates both immune activation and immune tolerance. It co‑stimulates T‑cell proliferation and cytokine secretion while reshaping chemokine activity by truncating CXCL10, CXCL11, and CXCL12. In the tumor microenvironment, DPP‑4 modulates immune cell infiltration and may promote immune escape. These properties make it a promising target for autoimmune diseases and cancer immunotherapy.

2. DPP‑4 in the Gut–Brain–Metabolism Axis

As a key regulator of gut hormones, DPP‑4 controls appetite, satiety, and energy balance. It also penetrates the blood–brain barrier and cleaves neuropeptides including neuropeptide Y (NPY), peptide YY (PYY), and substance P (SP), thereby influencing mood, cognition, pain, and neurodegeneration. Emerging evidence links DPP‑4 to Alzheimer’s disease, Parkinson’s disease, and diabetic cognitive dysfunction, opening new avenues for neuro‑metabolic research.

3. DPP‑4: Context‑Dependent Role in Cancer

DPP‑4 exhibits paradoxical roles in cancer. In some tumors, it suppresses invasion and metastasis; in many others, it drives epithelial–mesenchymal transition (EMT), cancer stemness, and drug resistance via TGF‑β and Wnt/β‑catenin signaling. Its ability to remodel the tumor immune microenvironment further complicates its function. Clarifying these context‑dependent effects is a major priority for NSFC‑funded oncology research.

4. Emerging Intervention Strategies Beyond Classical Inhibitors

Modern DPP‑4 research is moving beyond systemic enzyme inhibition toward precision medicine:

• Substrate‑selective modulation
• Non‑enzymatic protein–protein interaction blockade
• Tissue‑specific delivery systems
• Soluble DPP‑4 (sDPP‑4) as a diagnostic biomarker

Research Significance

DPP‑4 is a paradigm‑shifting target that unifies metabolism, immunity, neuroscience, and oncology. Its multifunctionality enables high‑impact, cross‑disciplinary projects ideal for NSFC funding. By dissecting its context‑specific mechanisms, researchers can develop safer, more selective therapies for diabetes, autoimmunity, neurodegeneration, and cancer.

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ANT BIO PTE. LTD. – Empowering Scientific Breakthroughs

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