| Summary: | Summary: Bone marrow (BM) stromal cells provide the regulatory framework for hematopoiesis and contribute to developmental stage-specific niches, such as those preserving hematopoietic stem cells. Despite advances in our understanding of stromal function, little is known about the transcriptional changes that this compartment undergoes throughout lifespan and during adaptation to stress. Using RNA sequencing, we perform transcriptional analyses of four principal stromal subsets, namely CXCL12-abundant reticular, platelet-derived growth factor receptor (PDGFR)-α+Sca1+, sinusoidal, and arterial endothelial cells, from early postnatal, adult, and aged mice. Our data reveal (1) molecular fingerprints defining cell-specific anatomical and functional features, (2) a radical reprogramming of pro-hematopoietic, immune, and matrisomic transcriptional programs during the transition from juvenile stages to adulthood, and (3) the aging-driven progressive upregulation of pro-inflammatory gene expression in stroma. We further demonstrate that transcriptomic pathways elicited in vivo by prototypic microbial molecules are largely recapitulated during aging, thereby supporting the inflammatory basis of age-related adaptations of BM hematopoietic function. : Using RNA sequencing, Helbling et al. analyze the dynamic changes in transcriptional landscape of four major bone marrow stromal cell types, from early postnatal to late aging stages and during responses to sterile infections. The authors reveal the activation of previously unappreciated global and cell-type-specific pro-inflammatory signatures during homeostatic aging. Keywords: stromal cells, bone marrow microenvironment, hematopoietic stem cells, niches, transcriptomics, aging, inflammation
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