Hormonal
Activation of mTORC1 via PKA phosphorylation of RAPTOR is an essential mechanism for β-adrenergic stimulation of adipose browning and UCP1 expression.
This research identifies a specific molecular pathway (PKA -> mTORC1 -> S6K1) required for your body to create 'beige fat' in response to cold or exercise. While you cannot directly 'dose' this pathway, understanding that mTORC1 is not just for storage but also for adaptive thermogenesis suggests that strategies promoting sympathetic activation (like cold exposure) rely on this pathway. Inhibiting mTOR chronically (as some longevity protocols do) might inadvertently blunt this adaptive fat-burning mechanism.
Mice with mTORC1 impairment, either through adipocyte-specific deletion of Raptor or pharmacologic rapamycin treatment, were refractory to the well-known βAR-dependent increase of uncoupling protein UCP1 expression and expansion of beige/brite adipocytes (so-called browning) in white adipose tissue (WAT).
Why this rating
Strong mechanistic evidence from multiple models (cell lines, mouse genetics, pharmacology), but primarily preclinical.
Source
Activation of mTORC1 is essential for β-adrenergic stimulation of adipose browning
Dianxin Liu et al. · Journal of Clinical Investigation · 2016
DOI 10.1172/jci83532
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