Hungry Hematopoietic Stem Cells during Bacterial Infection: Fatty Acid for Food

Hematopoietic stem cells (HSC) directly initiate a response to bacterial infections by rapidly entering the cell cycle in order to produce mature blood cells. An important issue in the field of HSC biology is to understand how metabolic activities of HSC are fueled during specific condition that require HSC activation. In their paper, Mistry et al. provide evidence that bacterial infections trigger an increased in free fatty acid uptake by HSC that fuel fatty acid oxidation and mitochondrial respiration activities. This increased fatty acid uptake is exclusively dependent on the upregulation of the fatty acid transporter CD36. This study shed important light into the metabolic needs of HSC during septic conditions.