Efferocytosis, the clearance of apoptotic cells (ACs) by macrophages, is critical for tissue resolution, with defects driving many diseases. Mechanisms of efferocytosis-mediated resolution are incompletely understood. Here, we show that AC-derived methionine regulates resolution through epigenetic repression of the extracellular signal-regulated kinase 1/2 (ERK1/2) phosphatase Dusp4. We focus on two key efferocytosis-induced pro-resolving mediators, prostaglandin E2 (PGE2) and transforming growth factor beta 1 (TGF-β1), and show that efferocytosis induces prostaglandin-endoperoxide synthase 2/cyclooxygenase 2 (Ptgs2/COX2), leading to PGE2 synthesis and PGE2-mediated induction of TGF-β1. ERK1/2 phosphorylation/activation by AC-activated CD36 is necessary for Ptgs2 induction, but this is insufficient owing to an ERK−DUSP4 negative feedback pathway that lowers phospho-ERK. However, subsequent AC engulfment and phagolysosomal degradation lead to Dusp4 repression, enabling enhanced p-ERK and induction of the Ptgs2−PGE2−TGF-β1 pathway. Mechanistically, AC-derived methionine is converted to S-adenosylmethionine, which is used by DNA methyltransferase-3A (DNMT3A) to methylate Dusp4. Bone-marrow DNMT3A deletion in mice blocks COX2/PGE2, TGF-β1, and resolution in sterile peritonitis, apoptosis-induced thymus injury and atherosclerosis. Knowledge of how macrophages use AC-cargo and epigenetics to induce resolution provides mechanistic insight and therapeutic options for diseases driven by impaired resolution.
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Cystathionine gamma-lyase (Cth) induces efferocytosis in macrophages via ERK1/2 to modulate intestinal barrier repair
Cell Communication and Signaling Open Access 23 January 2023
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This study did not generate any unique datasets or codes. All other data can be made available from the authors on reasonable request. Additional data associated with the paper can be found in the Supplementary Information. Source data are provided with this paper.
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We thank S. Mukherjee and A. Burke (Columbia University) for the Dnmt3afl/fl Vav1Cre+/– mice; R. Bowman and R. Levine (Memorial Sloan Kettering Cancer Center) for initial discussions about the experimental approach using Dnmt3a-targeted mice; and J. Wang and X. Huang (Columbia) for initial discussions on DNA methylation assays. We acknowledge C. Lu of the Columbia Center for Translational Immunology Core Facility for assisting in the flow cytometry and immunofluorescent imaging experiments, which were conducted in the Columbia Center for Translational Immunology Core Facility, funded by NIH grants P30CA013696, S10OD020056 and S10RR027050. This study was funded by a Transatlantic Network of Excellence (TNE-18CVD04) grant from the Leducq Foundation (to A.R.T. and I.T.) and by the following NIH grants: R00 DK115778 (to B.C.); T32 5T32HL007343-42 (to B.D.G.); K99 HL145131 (to A.Y.); R01 HL127464 (to I.T.); and R01 HL087123 and R35 HL145228 (to I.T.). B.C. received funding support from R00DK115778. S.S. and Y.S. acknowledge the Leukemia Research Foundation (Hollis Brownstein New Investigator Research Grant); AFAR (Sagol Network GerOmic Award); the Einstein Nathan Shock Center for the Biology of Aging, Deerfield (Xseed award); NIH P30 grant CA01333047; shared instrument grant NIH 1 S10 OD030286-01; and NIGMS grant 5 R01GM129350-04 (PI: Brenowitz). This work has also been supported in part by the Proteomics & Metabolomics Core Facility at the H. Lee Moffitt Cancer Center & Research Institute, an NCI designated Comprehensive Cancer Center (P30-CA076292).
The authors declare no competing interests.
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Extended Data Fig. 1 Additional experiments documenting the efferocytosis-Ptgs2/COX2-TGFβ1 pathway in macrophages. Related to Fig. 1.
BMDMs were incubated ± ACs, after which noninternalized ACs were removed by rinsing. The cells were assayed for Ptgs2 mRNA after an additional 1 h incubation and COX2 protein after 3 h (a); PGE2 in the media after 3 h (b); and TGFβ1 in the media after 18 h (c). For (d), experiments similar to those in panel a were analyzed for mouse and human Ptgs2/PTGS2 or Tgfb1/TGFβ1 mRNA to prove that mRNA being measured is not residual human mRNA derived from human apoptotic Jurkat cells. e, BMDMs were transfected with scrambled RNA (Scr) or siRbcn and then, after 72 h, assayed for Rbcn mRNA. f, BMDMs were transfected with Scr or siRbcn or treated with vehicle or bafilomycin A1 and then incubated with PKH26-labelled ACs for 45 min, followed by rinsing and quantification of percent PKH26+ macrophages of total macrophages. g, BMDMs were transfected with Scr or siPtgs2 and then, after 72 h, assayed for Ptgs2 mRNA. h, BMDMs were incubated ± ACs for 45 min, after which noninternalized ACs were removed by rinsing. The cells were assayed for Ptges mRNA after an additional 1 h incubation. i, BMDMs were transfected with scrambled RNA (Scr) or siPtges and then, after 72 h, assayed for Ptges mRNA. j-k, BMDMs were transfected with Scr, siPtger4, or siPtger2 and then, after 72 h, assayed for Ptger4 or Ptger2 mRNA, respectively. l, BMDMs were transfected with Scr or siTgfb1. After 72 h, the cells were incubated ± ACs for 45 min, after which noninternalized ACs were removed by rinsing. After an additional 1 h of incubation, the cells were assayed for Ptgs2 mRNA. m, BMDMs were transfected with Scr or siTgfb1 and then, after 72 h, assayed for Tgfb1 mRNA. All mRNA data are expressed relative to the first control group. Values are means ± SEM. ns, not significant (P > 0.05); n = 3 biological replicates. Two-sided P values were determined by a Student’s t-test for two groups or one-way ANOVA with Fisher’s LSD posthoc analysis for three or more groups.
Extended Data Fig. 2 Additional experiments documenting the role of SAM in the efferocytosis-Ptgs2/COX2-TGFβ1 pathway. Related to Figs. 2 & 3.
All AC incubations were 45 min, and Ptgs2 or Tgfb1 were assayed 1 or 6 h after AC removal, respectively. a, BMDMs pretreated 2 h with vehicle or the MAT2A inhibitor PF9366 were incubated with pHrodo-labeled ACs and quantified for the percent pHrodo-AC+ macrophages. Scale bar, 50 μm. b-c, BMDMs treated with scrambled RNA (Scr) or siMat2a were incubated ± ACs and then assayed for Ptgs2 orTgfb1. d, BMDMs treated with Scr or siMat2a were assayed for Mat2a. e, BMDMs treated with vehicle or SAM were assayed for SAM content. f, Jurkat cells were cultured in methionine-free DMEM supplemented with dialyzed FBS containing 13C515N-methionine and the MAT2A inhibitor, PF9366. The cells were rendered apoptotic after the third day of culture and analyzed by LC-MS/MS to show accumulation of 13C515N-methionine in the presence of MAT2A inhibitor, expressed as peak height, BMDMs cultured in methionine-free media with D-FBS and pretreated for 2 h with vehicle or bafilomycin A1 (Baf) were incubated 1 h with PKH26-labeled ACs whose proteins were labeled with 13C515N-methionine. AC+ and AC− macrophages were sorted and assayed for SAM content (g) and percent 13C515N-SAM of total SAM (h). i, Control or DNMT3A-KO BMDMs were incubated with PKH26−labelled ACs and then quantified for the percent PKH26-AC+ macrophages. Scale bar, 50 μm. j, Control and DNMT3A-KO BMDMs were immunoblotted for DNMT3A and β-actin. k, HMDMs treated with Scr or siDNMT3A were assayed for DNMT3A. l, BMDMs were incubated with IgG-coated RBCs for 45 min and then assayed 3 h later for COX2 MFI by flow cytometry. m-n, Control and DNMT3A-KO BMDMs treated with LPS or LPS + IFNγ for 4 h were assayed for Il6, Ptgs2, or COX2 (n). o-p, BMDMs treated with Scr or siDnmt3a were incubated for 24 h with vehicle and LPS + IFNγ or IL4 and assayed for Nos2 or Arg1. q, Control and DNMT3A-KO BMDMs were incubated ± ACs for 45 min and then assayed for SAM. r, BMDMs pretreated for 2 h with vehicle or bafilomycin A1 were incubated ± ACs whose proteins were labeled with 13C515N-methionine and then assayed 1 h after AC removal for 13C5-mC in DNA. s, BMDMs treated with Scr or siCreb1 were assayed for Creb1. All mRNA data are expressed relative to the first control group. Values are means ± SEM. n.s., not significant (P > 0.05); n = 3 biological replicates for all bar graphs except i (n = 6). Two-sided P values were determined by the Student’s t-test for two groups or one-way ANOVA with Fisher’s LSD posthoc analysis for three or more groups.
Extended Data Fig. 3 Experiments documenting the role of ERK, CD36, and DUSP4 in the efferocytosis-Ptgs2/COX2-TGFβ1 pathway. Related to Fig. 4.
AC incubations were 45 min, and Ptgs2 or Tgfb1 were assayed 1 or 6 h after AC removal, respectively. a, BMDMs incubated ± ACs were immunoblotted for p-ERK1/2, ERK1/2, and β-actin. b, BMDMs pretreated with vehicle or bafilomycin A1 were incubated ± PKH26-labelled ACs for 45 min and assayed by flow cytometry for p-ERK1/2 in PKH26+ (AC+) and PKH26- (AC−) macrophages. c-d, BMDMs transfected with scrambled RNA (Scr) or siMapk1 and siMapk3 were incubated ± ACs for 45 min and immunoblotted for ERK1/2, COX2, and β-actin or assayed for Ptgs2 or Tgfb1. e, WT or MerTK-KO BMDMs were incubated with PKH26-labelled ACs and assayed by flow cytometry for p-ERK1/2 or, after a 3-h chase, COX2. (f) BMDMs treated with Scr or siCd36 were assayed for Cd36. (g) BMDMs treated with Scr or siCd36 were incubated with pHrodo−labelled ACs and, after an 18-h chase, assayed by flow cytometry for TGFβ1 in pHrodo+ (AC+) and pHrodo- (AC−) macrophages. h, BMDMs pretreated for 2 h with vehicle or U0126 (MEK inhibitor) were incubated ± ACs and assayed for Dusp4. i, BMDMs treated with Scr, siDnmt3a, siDusp4, or siDnmt3a + siDusp4 were assayed for Dnmt3a or Dusp4. j-k, Control or DNMT3A-KO BMDMs transfected with Scr or siDusp4 as indicated were incubated ± ACs and assayed for Ptgs2 or Tgfb1. l-m, Control or DNMT3A-KO BMDMs treated with Scr or siDusp1 as indicated were incubated ± ACs and assayed for Ptgs2 or Tgfb1. n-o, BMDMs treated with Scr, siMat2a, siDusp4, or siMat2a + siDusp4 were incubated ± ACs and assayed for Tgfb1. p-q, BMDMs treated with Scr, siMapk1/3, siDusp4, or siMapk1/3 + siDusp4 were incubated ± ACs and assayed for Tgfb1, Mapk3, Mapk1, and Dusp4 after a 6-h chase. Data are expressed relative to the first control group. Values are means ± SEM. n.s., not significant (P > 0.05); n = 3 biological replicates. Two-sided P values were determined by the Student’s t-test for two groups or one-way ANOVA with Fisher’s LSD posthoc analysis for three or more groups.
Extended Data Fig. 4 In vivo evidence of AC−induced COX2-TGFβ1 pathway. Related to Fig. 5.
Wild-type (WT) C57BL/6 J mice were transplanted with bone marrow from Vav1Cre+/– (Control) or Dnmt3afl/fl Vav1Cre+/– (H-DNMT3A-KO) mice and, after 4 weeks, injected with PBS or dexamethasone (DEX). After 4 h, the thymus was harvested and immunostained with anti-annexin V to document the initial increase in apoptosis after PBS or DEX injection, n = 4 mice per group (a). For b (left), thymi were immunostained with Mac2 (green) and DNMT3A (Red). White arrows indicate non-macrophage DNMT3A, and brown arrows indicate macrophage DNMT3A. For b (right), documentation of co-localized p-ERK1/2, COX2, and Mac2. Representative image from n = 4 mice per group. Scale bar, 50 μm. c-d, Wildtype (WT) C57BL/6 J mice transplanted with bone marrow from control or H-DNMT3A-KO mice were injected i.p. with 1 mg/mL Zymosan A1. After 12 h, peritoneal exudate cells were analyzed by flow cytometry for F4/80+ and COX2+ cells (n = 4 mice/group) LAP-TGFβ1+ cells (n = 4 mice/group). e-m, Ldlr-/- (LDLR-KO) mice were transplanted with bone marrow from control or H-DNMT3A-KO mice and, after 4 weeks, fed a western-type diet (WD) for 12 weeks. Aortic root sections were immunostained for Mac2 and DNMT3A. Brown arrows indicate macrophage DNMT3A. Representative image from n = 8 mice per group (e); body weight, n = 10 mice/group (f); and the plasma or blood was assayed for the indicated metabolic and immune cell parameters, n = 10 mice/group (g-l) and the lipoprotein-cholesterol profile by FPLC (m). Scale bar, 50 μm. Values are means ± SEM; n.s., not significant (P > 0.05). Two-sided P values were determined by the Student’s t-test for two groups or one-way ANOVA with Fisher’s LSD posthoc analysis for three or more groups.
Extended Data Fig. 5 DNMT3A mediates efferocytosis and resolution in vivo. Related to Fig. 6.
BMDMs were pretreated with vehicle or a TGFβ1R inhibitor for 2 h and with vehicle or recombinant TGFβ1 for 1 h, as indicated. The macrophages were then incubated with PKH26−labelled ACs for 45 mins, followed by rinsing and quantification of percent PKH26-AC+ macrophages of total macrophages, n = 4 biological replicates. b-f, Wildtype (WT) C57BL/6 J mice were transplanted with bone marrow from control or H-DNMT3A-KO mice and, after 4 weeks, injected with PBS or dexamethasone (DEX). After 18 h, the thymi were weighed, n = 7 and 9 mice for PBS and DEX groups respectively (b); immunostained for DAPI, TUNEL, and Mac2 (c); assayed for F4/80+ cells, n = 5 mice per group (d); and assayed for TNF-a, n = 3 and 5 mice for PBS and DEX groups respectively and IL-6 by ELISA, n = 3 and 4 mice for PBS and DEX groups respectively (e-f). The image in b illustrates thymic macrophages with cytoplasmic TUNEL as an example of efferocytosing thymic macrophages. Scale bar, 100 μm. g, The peritoneal exudates were assayed for Ly6G+ polymorphonuclear cells (PMN) 18 hours after Zymosan A1 injection, n = 3 mice per group. h, Wild-type mice received 200 ng/mL recombinant TGFβ1 i.p. or vehicle control 15 and 20 hours after Zymosan injection and then assayed for the number of PMNs 4 hours later, n = 3 mice/group. i, Ldlr-/- (LDLR-KO) mice were transplanted with bone marrow from control or H-DNMT3A-KO mice and, after 4 weeks, fed a western-type diet (WD) for 12 weeks. Aortic root sections were quantified for lesional area, n = 8 mice/group. Values are means ± SEM; n.s., not significant (P > 0.05). Two-sided P values were determined by the Student’s t-test for two groups or one-way ANOVA with Fisher’s LSD posthoc analysis for three or more groups.
Supplementary Tables 1–3 and Extended Data figure legends.
Source Data Fig. 3
Unprocessed western blots for Fig. 3b and 3m.
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Unprocessed western blots for Extended Data Fig1a.
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Unprocessed western blots for Extended Data Fig. 2j and 2n.
Source Data Extended Data Fig. 3
Unprocessed western blots for Extended Data Fig. 3a and 3c.
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Ampomah, P.B., Cai, B., Sukka, S.R. et al. Macrophages use apoptotic cell-derived methionine and DNMT3A during efferocytosis to promote tissue resolution. Nat Metab 4, 444–457 (2022). https://doi.org/10.1038/s42255-022-00551-7
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