PMID- 36754230 OWN - NLM STAT- MEDLINE DCOM- 20230223 LR - 20240402 IS - 1879-2618 (Electronic) IS - 1388-1981 (Print) IS - 1388-1981 (Linking) VI - 1868 IP - 4 DP - 2023 Apr TI - Functional characterization of interleukin 4 and retinoic acid signaling crosstalk during alternative macrophage activation. PG - 159291 LID - S1388-1981(23)00015-X [pii] LID - 10.1016/j.bbalip.2023.159291 [doi] AB - Retinoic acid possesses potent immunomodulatory properties in various cell types, including macrophages. In this study, we first investigated the effects at the transcriptional and functional levels of exogenous retinoic acid in murine bone marrow-derived macrophages (BMDMs) in the presence or absence of interleukin 4 (IL4), a cytokine with potent anti-inflammatory properties. We examined the effect of IL4 on vitamin A homeostasis in macrophages by quantifying retinoid synthesis and secretion. Our RNAseq data show that exogenous retinoic acid synergizes with IL4 to regulate anti-inflammatory pathways such as oxidative phosphorylation and phagocytosis. Efferocytosis and lysosomal degradation assays validated gene expression changes at the functional level. IL4 treatment altered the expression of several genes involved in vitamin A transport and conversion to retinoic acid. Radiolabeling experiments and mass spectrometry assays revealed that IL4 stimulates retinoic acid production and secretion in a signal transducer and activator of transcription 6 (STAT6)-dependent manner. In summary, our studies highlight the key role of exogenous and endogenous retinoic acid in shaping the anti-inflammatory response of macrophages. CI - Copyright (c) 2023 Elsevier B.V. All rights reserved. FAU - Pinos, Ivan AU - Pinos I AD - Division of Nutritional Sciences, University of Illinois Urbana Champaign, Urbana, IL, United States. FAU - Yu, Jianshi AU - Yu J AD - Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD, United States. FAU - Pilli, Nageswara AU - Pilli N AD - Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD, United States. FAU - Kane, Maureen A AU - Kane MA AD - Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD, United States. FAU - Amengual, Jaume AU - Amengual J AD - Division of Nutritional Sciences, University of Illinois Urbana Champaign, Urbana, IL, United States; Department of Food Science and Human Nutrition, University of Illinois Urbana Champaign, Urbana, IL, United States. Electronic address: jaume6@illinois.edu. LA - eng GR - R01 HL147252/HL/NHLBI NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, Non-U.S. Gov't DEP - 20230206 PL - Netherlands TA - Biochim Biophys Acta Mol Cell Biol Lipids JT - Biochimica et biophysica acta. Molecular and cell biology of lipids JID - 101731727 RN - 5688UTC01R (Tretinoin) RN - 207137-56-2 (Interleukin-4) RN - 11103-57-4 (Vitamin A) RN - 0 (Anti-Inflammatory Agents) SB - IM MH - Mice MH - Animals MH - *Tretinoin/pharmacology MH - *Interleukin-4/metabolism MH - Vitamin A MH - Macrophage Activation MH - Anti-Inflammatory Agents PMC - PMC9974901 MID - NIHMS1873465 OTO - NOTNLM OT - Immunometabolism OT - Macrophage OT - Retinoids OT - Vitamin A COIS- Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. EDAT- 2023/02/09 06:00 MHDA- 2023/02/25 06:00 PMCR- 2024/04/01 CRDT- 2023/02/08 19:25 PHST- 2022/11/19 00:00 [received] PHST- 2023/01/25 00:00 [revised] PHST- 2023/01/28 00:00 [accepted] PHST- 2023/02/09 06:00 [pubmed] PHST- 2023/02/25 06:00 [medline] PHST- 2023/02/08 19:25 [entrez] PHST- 2024/04/01 00:00 [pmc-release] AID - S1388-1981(23)00015-X [pii] AID - 10.1016/j.bbalip.2023.159291 [doi] PST - ppublish SO - Biochim Biophys Acta Mol Cell Biol Lipids. 2023 Apr;1868(4):159291. doi: 10.1016/j.bbalip.2023.159291. Epub 2023 Feb 6.