Trypanosoma brucei parasites occupy and functionally adapt to the adipose tissue in mice

Sandra Trindade, Filipa Rijo-Ferreira, Tânia Carvalho, Daniel Pinto-Neves, Fabien Guegan, Francisco Aresta-Branco, Fabio Bento, Simon A. Young, Andreia Pinto, Jan Van Den Abbeele, Ruy M. Ribeiro, Sérgio Dias, Terry K Smith, Luisa M. Figueiredo

Research output: Contribution to journalArticlepeer-review

Abstract

Trypanosoma brucei is an extracellular parasite that causes sleeping sickness. In mammalian hosts, trypanosomes are thought to exist in two major niches: early in infection, they populate the blood; later, they breach the blood-brain barrier. Working with a well-established mouse model, we discovered that adipose tissue constitutes a third major reservoir for T. brucei. Parasites from adipose tissue, here termed adipose tissue forms (ATFs), can replicate and were capable of infecting a naive animal. ATFs were transcriptionally distinct from bloodstream forms, and the genes upregulated included putative fatty acid β-oxidation enzymes. Consistent with this, ATFs were able to utilize exogenous myristate and form β-oxidation intermediates, suggesting that ATF parasites can use fatty acids as an external carbon source. These findings identify the adipose tissue as a niche for T. brucei during its mammalian life cycle and could potentially explain the weight loss associated with sleeping sickness.
Original languageEnglish
Pages (from-to)837-848
Number of pages13
JournalCell Host & Microbe
Volume19
Issue number6
Early online date26 May 2016
DOIs
Publication statusPublished - 8 Jun 2016

Keywords

  • African trypanosomes
  • Fat
  • Mouse infection
  • Fatty acid β-oxidation
  • Metabolism
  • Transcriptome

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