Research
Hormonal
Leptin acts as a key initiator of VAT inflammation by promoting the differentiation of CD4 T cells into Th1 and Th17 subsets and inducing T-cell exhaustion via STAT3 signaling and PD-1 expression.
High levels of leptin in obesity don't just signal hunger; they actively reprogram immune cells in fat tissue to become pro-inflammatory and exhausted. This suggests that managing leptin sensitivity or levels might be important for reducing chronic inflammation associated with obesity.
GoodSupportsHIGH confidence
Leptin is one of the initiators of VAT inflammation that promotes Th1 differentiation of VAT T cells, and long-term exposure to leptin induces immune exhaustion... Leptin also promotes differentiation of T cells into Th17 cells... In the pathogenesis of chronic obesity, leptin signaling contributes to T-cell exhaustion by activating homeostatic STAT3 signaling and thus inducing PD-1 expression.
Why this rating
Supported by multiple references in the review regarding leptin's effects on T-cell subsets and exhaustion markers.
Source
Drastic transformation of visceral adipose tissue and peripheral CD4 T cells in obesity
Kohsuke Shirakawa et al. · Frontiers in Immunology · 2023
DOI 10.3389/fimmu.2022.1044737
narrative_reviewCited 26×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Obesity induces a state of CD4 T-cell exhaustion and senescence in visceral adipose tissue (VAT), characterized by persistent PD-1 expression and restricted effector function, which creates a negative legacy that persists after weight loss and contributes to treatment resistance.Good
- Adiponectin normally suppresses VAT T-cell inflammation by inhibiting T-cell proliferation and promoting apoptosis, but its levels are reduced in obesity, thereby releasing the 'brake' on inflammatory T-cell responses.Good
Related findings · Hormonal
- Initial treatment for type 2 diabetes should be a combination of metformin and either an SGLT-2 inhibitor or a GLP-1 receptor agonist to achieve cardiorenal protection, rather than monotherapy or older agents like sulfonylureas.Strong
- For patients with specific monogenic obesity syndromes (leptin deficiency, POMC/PCSK1/LEPR mutations), targeted pharmacotherapy (recombinant leptin or setmelanotide) is highly effective and should be prioritized, unlike in polygenic obesity.Strong
- Continued weekly administration of 2.4 mg subcutaneous semaglutide prevents weight regain and promotes further weight loss in adults with overweight or obesity, whereas switching to placebo results in significant weight regain.Strong
This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →