NPY from Sympathetic Nerves Protects Against Obesity by Maintaining Brown Fat Activity | Research

The takeaway

Sympathetic nerve-derived neuropeptide Y sustains thermogenic brown and beige fat, protecting against obesity — challenging the prevailing view that NPY only promotes weight gain.

NPY protects from obesity
Sympathetic NPY sustains thermogenic fat — opposite to brain NPY, which promotes hunger and weight gain

What the researchers found

Sympathetic nerve-derived NPY sustained thermogenic brown and beige fat, with its loss leading to reduced thermogenesis and increased obesity — opposite to NPY's pro-obesity role in the brain.

Why it matters

Understanding that NPY has opposite metabolic effects in different tissues (brain: weight gain vs. sympathetic: weight protection) fundamentally changes how we think about this peptide and could lead to tissue-targeted anti-obesity therapies.

The numbers in context

NPY+ sympathetic axons are a smaller subset mapping to perivasculature; mural cells identified as main NPY-responsive cells by scRNA-seq.

How the study worked

Characterized sympathetic NPY signaling in thermogenic fat tissue. Used genetic models to disrupt sympathetic NPY and assessed effects on brown/beige fat, thermogenesis, and body weight.

Who was studied

Mice with sympathetic NPY manipulation, tissue clearing imaging, and scRNA-seq analysis

What this study cannot tell us

Mouse study — sympathetic NPY roles in human thermogenic fat may differ. The balance between central and peripheral NPY effects in human obesity is poorly understood.

How to read the evidence

Moderate evidence: well-designed mouse study with genetic models revealing a novel NPY function. Paradigm-shifting but needs human validation.

When this study was published

Published in 2024. Fundamentally revises understanding of NPY in metabolism.

The bigger picture

This study is a paradigm shift for NPY biology. For decades, NPY was considered a "pro-obesity" peptide. Discovering its anti-obesity role in sympathetic nerves shows that neuropeptide function depends entirely on context — a principle with broad implications for peptide drug development.

Questions still open

Could drugs that boost sympathetic NPY signaling in fat tissue promote weight loss?
Does the balance between brain and sympathetic NPY shift with age or obesity?
How does exercise affect sympathetic NPY and thermogenic fat maintenance?

Common questions

Doesn't NPY cause weight gain?

In the brain, yes — NPY stimulates appetite. But this study shows that NPY released by sympathetic nerves in fat tissue does the opposite: it maintains heat-producing brown fat that burns calories. The same peptide has opposite effects depending on where it acts in the body.

Could this lead to new weight loss treatments?

Potentially. If drugs could boost sympathetic NPY signaling specifically in fat tissue without affecting brain NPY (which increases hunger), they could promote calorie-burning brown fat and help with weight loss. This is a new therapeutic concept.

Read the original research

Sympathetic neuropeptide Y protects from obesity by sustaining thermogenic fat.

Nature, 634(8032), 243-250

View on PubMed ↗Publisher’s paper ↗

Citation

Zhu, Yitao; Yao, Lu; Gallo-Ferraz, Ana L; Bombassaro, Bruna; Simões, Marcela R; Abe, Ichitaro; Chen, Jing; Sarker, Gitalee; Ciccarelli, Alessandro; Zhou, Linna; Lee, Carl; Sidarta-Oliveira, Davi; Martínez-Sánchez, Noelia; Dustin, Michael L; Zhan, Cheng; Horvath, Tamas L; Velloso, Licio A; Kajimura, Shingo; Domingos, Ana I. (2024). Sympathetic neuropeptide Y protects from obesity by sustaining thermogenic fat.. Nature, 634(8032), 243-250. https://doi.org/10.1038/s41586-024-07863-6