Mammary duct luminal epithelium controls adipocyte thermogenic programme

Sanil Patel, Njeri Z.R. Sparman, Douglas Arneson, Alexandra Alvarsson, Luís C. Santos, Samuel J. Duesman, Alessia Centonze, Ephraim Hathaway, In Sook Ahn, Graciel Diamante, Ingrid Cely, Chung Hwan Cho, Noble Kumar Talari, Abha K. Rajbhandari, Leigh Goedeke, Peng Wang, Atul J. Butte, Cédric Blanpain, Karthickeyan Chella Krishnan, Aldons J. LusisSarah A. Stanley, Xia Yang, Prashant Rajbhandari

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Sympathetic activation during cold exposure increases adipocyte thermogenesis via the expression of mitochondrial protein uncoupling protein 1 (UCP1) 1. The propensity of adipocytes to express UCP1 is under a critical influence of the adipose microenvironment and varies between sexes and among various fat depots 2–7. Here we report that mammary gland ductal epithelial cells in the adipose niche regulate cold-induced adipocyte UCP1 expression in female mouse subcutaneous white adipose tissue (scWAT). Single-cell RNA sequencing shows that glandular luminal epithelium subtypes express transcripts that encode secretory factors controlling adipocyte UCP1 expression under cold conditions. We term these luminal epithelium secretory factors ‘mammokines’. Using 3D visualization of whole-tissue immunofluorescence, we reveal sympathetic nerve–ductal contact points. We show that mammary ducts activated by sympathetic nerves limit adipocyte UCP1 expression via the mammokine lipocalin 2. In vivo and ex vivo ablation of mammary duct epithelium enhance the cold-induced adipocyte thermogenic gene programme in scWAT. Since the mammary duct network extends throughout most of the scWAT in female mice, females show markedly less scWAT UCP1 expression, fat oxidation, energy expenditure and subcutaneous fat mass loss compared with male mice, implicating sex-specific roles of mammokines in adipose thermogenesis. These results reveal a role of sympathetic nerve-activated glandular epithelium in adipocyte UCP1 expression and suggest that mammary duct luminal epithelium has an important role in controlling glandular adiposity.

Original languageEnglish
Pages (from-to)192-199
Number of pages8
Issue number7972
StatePublished - 3 Aug 2023


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