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In a previous study, we identified 1,25(OH)2D3-responsive and vitamin D receptor (VDR)-bound super-enhancer regions in THP-1 cells. Herein, we examined the transcriptional regulation of ArfGAP with SH3 Domain, Ankyrin Repeat and PH Domain 2 (ASAP2) (encoding a GTPase-activating protein) by 1,25(OH)2D3 through the top-ranked VDR-bound super-enhancer region in the first intron of ASAP2 and potential functions of ASAP2 in macrophages. First, we validated the upregulation of ASAP2 by 1,25(OH)2D3 in both THP-1 cells and macrophages. Subsequently, we identified three regulatory regions (i.e., the core, 1,25(OH)2D3-responsive, and inhibitory regions) in the VDR bound-enhancer of ASAP2. ASAP2 promoted RAC1-activity and macrophage efferocytosis in vitro. Next, we assessed the functions of ASAP2 by mass spectrometry and RNA sequencing analyses. ASAP2 upregulated the expressions of antiviral-associated genes and interacted with SAM and HD domain-containing deoxynucleoside triphosphate triphosphohydrolase 1 (SAMHD1). In vivo, vitamin D reduced the number of apoptotic cells in experimental autoimmune encephalomyelitis (EAE) and promoted macrophage efferocytosis in peritonitis without changing the mRNA level of ASAP2. Thus, we could better understand the regulatory mechanism underlying ASAP2 transcription and the function of ASAP2, which may serve as a potential treatment target against inflammatory diseases and virus infections.<\/jats:p>","DOI":"10.3390\/nu14224935","type":"journal-article","created":{"date-parts":[[2022,11,22]],"date-time":"2022-11-22T03:08:37Z","timestamp":1669086517000},"page":"4935","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["1,25(OH)2D3 Promotes Macrophage Efferocytosis Partly by Upregulating ASAP2 Transcription via the VDR-Bound Enhancer Region and ASAP2 May Affect Antiviral Immunity"],"prefix":"10.3390","volume":"14","author":[{"given":"Hui","family":"Shi","sequence":"first","affiliation":[{"name":"Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei 230032, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiangling","family":"Duan","sequence":"additional","affiliation":[{"name":"Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei 230032, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiayu","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei 230032, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Haohao","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei 230032, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1966-8249","authenticated-orcid":false,"given":"Zhiheng","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei 230032, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shuaideng","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Human Anatomy, School of Basic Medical Sciences, Anhui Medical University, Hefei 230032, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xueyan","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Human Anatomy, School of Basic Medical Sciences, Anhui Medical University, Hefei 230032, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3044-8423","authenticated-orcid":false,"given":"Ming","family":"Lu","sequence":"additional","affiliation":[{"name":"Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei 230032, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,11,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2127","DOI":"10.4049\/jimmunol.1102412","article-title":"Vitamin D inhibits monocyte\/macrophage proinflammatory cytokine production by targeting MAPK phosphatase-1","volume":"188","author":"Zhang","year":"2012","journal-title":"J. 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