Maternal Western-Style Diet Impairs Bone Marrow Development and Drives a Hyperinflammatory Phenotype in Hematopoietic Stem and Progenitor Cells in Fetal Rhesus Macaques

Background Maternal obesity adversely impacts the in utero metabolic environment and offspring’s health, but its effect on fetal hematopoiesis and immune cell development remains incompletely understood, particularly in models that resemble human development. Methods We studied gestational day 130-135 fetuses derived from rhesus macaque dams chronically exposed to a high-fat Western-style diet (WSD) or a low-fat control diet. Fetal immune cell phenotypes and fetal bone marrow architecture and hematopoietic stem and progenitor cell (FBM HSPC) function were examined using bone computed tomography, histology, flow cytometry, single-cell RNA-sequencing, and HSPC transplantation assays. Findings Maternal WSD induced premature FBM cavity opening and a codominant increase in the number of FBM adipocytes. Furthermore, a maternal WSD induced a proinflammatory transcriptional response in FBM HSPCs. FBM macrophages from the WSD group exhibited heightened proinflammatory responses to toll-like receptor agonist stimulation. Maternal WSD exposure suppressed the expression of genes required for B-cell development and decreased the frequencies of FBM B-cells. Finally, maternal WSD led to poor engraftment of FBM HSPCs in nonlethally irradiated immunodeficient NOD/SCID/IL2rγ-/- mice. Interpretations Maternal WSD impairs FBM development, drives a hyperinflammatory phenotype, and induces functional and differentiation impairment in FBM HSPCs in a translationally relevant nonhuman primate model. Funding National Institute of Health RESEARCH IN CONTEXT Evidence before this study Maternal obesity is associated with increased risk of infections and proinflammatory disease in offspring. The translationally-relevant rhesus macaque model was utilized to address the effects of maternal obesogenic diet on fetal hematopoietic and immune cell development. Added value of this study We assessed changes in fetal immune cell phenotypes and fetal hematopoietic stem and progenitor cell function using immunohistochemistry, flow cytometry, single-cell RNA sequencing, and transplantation assays. We determined that chronic consumption of a maternal obesogenic diet induced the development of adipogenic and proinflammatory environments in the fetal bone marrow. Additionally, we detected the impairment in B-cell differentiation program in fetal hematopoietic stem and progenitor cells. Implications of all the available evidence These data demonstrate that maternal obesogenic diet modulates fetal hematopoietic development and could impact the offspring’s immune system, including proinflammatory phenotype and a decline in B-cell function.

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