Ghrelin inhibited leptin- and activation-induced pro-inflammatory cytokine production (IL-1β, IL-6, TNF-α) in human monocytes and T-cells through GHS-R, revealing a novel anti-inflammatory role for the hunger hormone.
Anti-inflammatory hungerGhrelin (the hunger hormone) actively suppresses inflammatory cytokines in immune cells — being hungry is anti-inflammatory, being fed is pro-inflammatory
What the researchers found
Ghrelin inhibited leptin-induced and activation-induced IL-1β, IL-6, and TNF-α production in human monocytes and T-cells through functional GHS-R on immune cells, establishing an anti-inflammatory role that opposes leptin's pro-inflammatory effects.
Why it matters
The ghrelin-leptin opposition extends to inflammation: ghrelin (hungry) suppresses inflammation while leptin (fed) promotes it. This metabolic-immune connection has implications for inflammatory diseases and obesity-related inflammation.
How the study worked
In-vitro study. Human monocytes and T-cells treated with ghrelin ± leptin or activation stimuli. Pro-inflammatory cytokine production measured. GHS-R expression on immune cells confirmed.
What this study cannot tell us
In-vitro immune cell study. The physiological significance of ghrelin's anti-inflammatory effect at circulating concentrations needs in-vivo confirmation.
How to read the evidence
Moderate evidence from a well-designed in-vitro study with human immune cells, receptor confirmation, and direct ghrelin-leptin opposition demonstrated.
When this study was published
Published in 2004. Ghrelin's anti-inflammatory properties have been extensively confirmed and have implications for inflammatory diseases and critical illness.
The bigger picture
Obesity (high leptin, low ghrelin) creates a pro-inflammatory state. This study provides the molecular mechanism: the ghrelin-leptin balance directly controls immune cell inflammation.
Questions still open
- Could ghrelin agonists treat inflammatory diseases?
- Does obesity's low ghrelin/high leptin state drive chronic inflammation?
- Would ghrelin supplementation reduce obesity-related inflammation?
Common questions
Is being hungry anti-inflammatory?
Does this explain inflammation in obesity?
Read the original research
Ghrelin inhibits leptin- and activation-induced proinflammatory cytokine expression by human monocytes and T cells.
The Journal of clinical investigation, 114(1), 57-66
Citation
Dixit, Vishwa Deep; Schaffer, Eric M; Pyle, Robert S; Collins, Gary D; Sakthivel, Senthil K; Palaniappan, Ravichandran; Lillard, James W; Taub, Dennis D. (2004). Ghrelin inhibits leptin- and activation-induced proinflammatory cytokine expression by human monocytes and T cells.. The Journal of clinical investigation, 114(1), 57-66.