Adipose NNAT functions as a molecular rheostat to promote or inhibit lipolysis and insulin resistance depending on the dietary context.

In male mice, adipocyte-specific NNAT loss has opposite effects on systemic insulin sensitivity depending on diet: it worsens insulin resistance on standard diet but protects on high-fat diet.

• Why it matters: Insulin and catecholamines counter-regulate metabolism, yet how adrenergically regulated ER stress pathways in adipocytes shape whole-body insulin sensitivity across diets is unclear.
• What they did: Using inducible, adipocyte-specific NNAT deletion in male mice, the study measured insulin sensitivity, lipolysis, ER Ca2+ handling, ER stress activation, adiponectin secretion, and energy expenditure under standard versus high-fat diets.
• The result: On standard diet, NNAT deletion promotes insulin resistance and adipose tissue loss via lipolysis driven by altered Ca2+ handling and ER stress; on high-fat diet, it ameliorates ER stress, reduces lipolysis, protects from diet-induced insulin resistance, increases energy expenditure, and stimulates adiponectin secretion.

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