Cell-intrinsic lysosomal lipolysis is essential for alternative activation of macrophages

Abstract

Alternative (M2) activation of macrophages driven via the α-chain of the receptor for interleukin 4 (IL-4Rα) is important for immunity to parasites, wound healing, the prevention of atherosclerosis and metabolic homeostasis. M2 polarization is dependent on fatty acid oxidation (FAO), but the source of the fatty acids that support this metabolic program has not been clear. We found that the uptake of triacylglycerol substrates via the scavenger receptor CD36 and their subsequent lipolysis by lysosomal acid lipase (LAL) was important for the engagement of elevated oxidative phosphorylation, enhanced spare respiratory capacity (SRC), prolonged survival and expression of genes that together define M2 activation. Inhibition of lipolysis suppressed M2 activation during infection with a parasitic helminth and blocked protective responses to this pathogen. Our findings delineate a critical role for cell-intrinsic lysosomal lipolysis in M2 activation.

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Figure 1: M2 activation is characterized by increased SRC and is dependent on FAO.
Figure 2: Lipolysis is essential for the M2 activation and survival of macrophages.
Figure 3: Lipolysis for M2 activation is mediated by LAL.
Figure 4: CD36 is critical for M2 activation.
Figure 5: The peritoneal cavity is a site of M2 activation of macrophages during infection with H. polygrus, and M2 activation is dependent on LAL.
Figure 6: Inhibition of lipolysis suppresses IL-4-driven M2 activation of macrophages in vivo and the elimination of a primary H. polygyrus infection.
Figure 7: Inhibition of lipolysis suppresses resistance to reinfection with H. polygyrus.

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Acknowledgements

We thank G. Haemmerle and R. Zechner for permission to use Pnpla2−/− mice; C. Semenkovich (Washington University in St. Louis) and R. Gross (Washington University in St. Louis) for Pnpla2−/− mice; H. Virgin, E.L. Gautier and S. Ivanov for discussions; and the staff of the Department of Pathology & Immunology Flow Cytometry Core and the Metabolomics Core of the Diabetic Cardiovascular Disease Center for technical assistance. Supported by the US National Institutes of Health (AI32573 and CA164062 to E.J.P.; AI091965 and CA158823 to E.L.P.; DK060022 to N.A.A.; HL087001 to H.D.; and CA138759 and CA152099 to C.Y.).

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S.C.-C.H., B.E., Y.I., D.O., M.N., N.A.A., J.F.U., M.N.A., E.L.P. and E.J.P., designed experiments; S.C.-C.H., B.E., Y.I., D.O., M.N., A.M.S., W.B., L.L.-G., W.Y.L., C.M.O., C.Y. and H.D. did experiments; S.C.-C.H., B.E., M.N., D.O., W.Y.L., C.M.O., N.A.A., M.N.A., E.L.P. and E.J.P. analyzed data; and S.C.-C.H. and E.J.P. wrote the paper.

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Correspondence to Edward J Pearce.

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The authors declare no competing financial interests.

Integrated supplementary information

Supplementary Figure 1 Fatty acid oxidation is emphasized in M2 1 macrophages compared with that in M1 macrophages.

Gene expression of mitochondrial OXPHOS (Atp5j, Cox4i1, Uqcrc1/2, Ndufs1, Sdhb) and β-oxidation (Acadm, Acox1, Crot, CPT2, Acadl, Crat) pathways in M2 and M1 macrophages. (b) Relative expression in M1 vs. M2 macrophages of key activation indicator genes used for the analysis in a. (c) Expression levels of genes used in this study (GSE53053). Data shown are from two independent RNA-Seq analyses.

Supplementary Figure 2 M2 macrophages survive longer than M0 or M1 macrophages do.

Cell survival, measured by lack of staining with 7-AAD, in cultured macrophages over time. Tissue culture medium and activation signals (IL-4 for M2, IFN-γ and LPS for M1) were replaced every 2 days. Data points are mean values + SEM for 3 replicate conditions per time point from 1 experiment representative of 2.

Supplementary Figure 3 Lack of ATGL does not affect M2 activation in vivo, and lipid droplets accumulate in M2 macrophages when lipolysis is inhibited.

(a) M2 activation in peritoneal macrophages from wild-type (Pnpla2+/+) and Pnpla2-/- mice injected with PBS (wild-type only) or IL-4c was measured by RELMα expression using flow cytometry. Numbers indicate mean ± SEM values for % macrophages positive for RELMα in 3 technical replicates per condition. Data are from peritoneal macrophages pooled from 2 mice per group from 1 experiment representative of 3. (b) Representative electron micrographs of macrophages cultured in IL-4 in the presence of orlistat for 24 h (M2 + orlistat) and of Lipa shRNA-transduced macrophages cultured in IL-4 for 24 h (M2 + Lipa shRNA); These images from 1 experiment representative of 2. c) Neutral lipid accumulation in M2 macrophages cultured in complete medium in the absence or presence of orlistat or chloroquine (CLQ). Neutral lipids were detected by BODIPY staining followed by flow cytometry. Fluorescence staining was compared to unstained cells (US), M0 cells, and to M2 cells cultured without orlistat or CLQ. Data are from 1 experiment representative of 2. (d) Mass spectrometric quantitation of different triacylglycerol (TG) and cholesterol ester (CE) species in M0. M1, M2, and orlistat treated M2 macrophages. Ratios reflect fatty acid chain length to double bonds for the species detected in TGs, or for CEs. In d, data are mean ± SEM values from 2 replicate samples from one experiment. Numbers above graph bars show actual mean values per condition.

Supplementary Figure 4 CD36 is not required for increased palmitate uptake by M2 macrophages but is important for LDL uptake and M2 activation.

(a) BODIPY-palmitate uptake by WT and Cd36-/- M0 and M2 macrophages, as measured by flow cytometry. (b-g) The effect of the CD36 inhibitor sulfo-N-succinimidyl oleate (SSO) on (b) the uptake of LDL by M2 macrophages, (c) basal OCR, the ratio of basal OCR to basal ECAR, and SRC in M2 macrophages, (d) basal OCR and the ratio of basal OCR to basal ECAR in M1 macrophages, (e) CD206 and CD301 expression and PD-L2 and RELMα expression by M2 macrophages, (f) iNOS expression by M1 macrophages. In b-g macrophages were pre-treated with SSO for 30 minutes prior to the addition of polarizing stimuli, and data were collected 24 h later. Data in b-g from M0 macrophages are shown for comparison. Data in the histograms in a and b are from 1 experiment representative of 2. Data in the bar graph in a are means ± SEM of data from 2 independent experiments. Data in c and d are means ± SEM of 3 technical replicates from one experiment representative of 3. Numbers in e refer to the percentages of macrophages that fall within the indicated gates. Plots are from one representative experiment, numbers are means ± SEM of data from 3 independent experiments. In f, histograms showing expression of iNOS are from one experiment representative of 2, numbers are means ± SEM from 2 independent experiments of % of cells expressing iNOS. P values are from Student’s t-test (*P < 0.01; **P < 0.0001).

Supplementary Figure 5 M2 activation can occur in serum-free conditions but is increased by the addition of serum or LDL and VLDL.

(a) Macrophages were cultured with IL-4 (M2) for 24 h in medium containing (+Serum) or lacking serum (-Serum), or in serum free medium with added 5 or 50 μg/ml of LDL/VLDL (5-L/V or 50-L/V). PD-L2 and RELMα expression were measured by flow cytometry, (b) Macrophages were cultured with IL-4 for 24 h in the absence (M2) or presence of inhibitors of lipolysis (orlistat) or fatty acid synthesis (TOFA), in medium containing (+Serum) or lacking (-Serum) serum. In both a and b, cells destined to be tested in serum-free medium were pre-cultured under these conditions for 24 h prior to the addition of IL-4. Numbers refer to the percentages of macrophages that fall within the indicated gates. Plots are from one experiment representative of 2, numbers are means ± SEM of data from 2 independent experiments.

Supplementary Figure 6 Inhibition of lipolysis does not prevent IL-4 production by TH2 cells during H. polygyrus infection.

4get/KN2 IL-4 reporter mice were infected with H. polygyrus and treated with the anti-helminthic pyrantel pamoate prior to receiving a secondary infection (2°Hp). At the time of secondary infection, additional groups of mice were infected for the first time to provide primary H. polygyrus infection controls (1°Hp). Infected mice were treated with Orlistat, or remained untreated, as indicated. At day 9 post infection, mice were sacrificed and mesenteric lymph nodes were removed. (a) Cellularity of mesenteric lymph nodes in naïve 4get/KN2 mice and in infected mice mice treated variously as shown. (b) IL-4 production, as measured by flow cytometric analysis of expression of huCD2 and GFP immediately ex vivo, in gated CD4+ T cells from mesenteric lymph nodes of 4get/KN2 mice under the conditions shown (see Fig. 7 legend for more details). In these plots, GPF expression reflects transcription of the Il4 gene, and huCD2 expression reflects IL-4 protein production. Data in a represent mean values ± SEM from 3 or more individually assessed mice from 1 experiment representative of 2. Data in b are from lymph nodes pooled from 3 or more mice per group from 1 experiment representative of 2. Numbers in b represent percentages of CD4+ T cells falling within indicated gates. NS = not significant according to Student’s t-test.

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Huang, SC., Everts, B., Ivanova, Y. et al. Cell-intrinsic lysosomal lipolysis is essential for alternative activation of macrophages. Nat Immunol 15, 846–855 (2014). https://doi.org/10.1038/ni.2956

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