www.sciencetranslationalmedicine.org/cgi/content/full/7/282/282ra47/DC1 Supplementary Materials for Vitamin D–dependent induction of cathelicidin in human macrophages results in cytotoxicity against high-grade B cell lymphoma Heiko Bruns,* Maike Büttner, Mario Fabri, Dimitrios Mougiakakos, Jörg T. Bittenbring, Markus H. Hoffmann, Fabian Beier, Shirin Pasemann, Regina Jitschin, Andreas D. Hofmann, Frank Neumann, Christoph Daniel, Anna Maurberger, Bettina Kempkes, Kerstin Amann, Andreas Mackensen, Armin Gerbitz *Corresponding author. E-mail: [email protected]Published 8 April 2015, Sci. Transl. Med. 7, 282ra47 (2015) DOI: 10.1126/scitranslmed.aaa3230 The PDF file includes: Materials and Methods Fig. S1. M2-like phenotype of TAMs in BL. Fig. S2. Cytokine profile in lymph node sections. Fig. S3. Phenotype of generated M1 and M2 macrophages. Fig. S4. Activation of M1 and M2 macrophages after exposure to Raji targets. Fig. S5. Analysis of effector molecules secreted by macrophages. Fig. S6. Expression of TNFR1, CD95, DR4, and DR5 on BL cell lines. Fig. S7. Phagocytosis of BL cells. Fig. S8. Dose-dependent cytotoxicity of LL-37 for BL Raji cells. Fig. S9. Expression of “LL-37 receptors” on BL cell lines and proliferating B cells. Fig. S10. Cytotoxic activity of LL-37 counteracted by overexpression of BCL-2. Fig. S11. LL-37 targeting mitochondria of BL cells. Fig. S12. Z-stack analysis of colocalization of LL-37 and mitochondria. Fig. S13. Colocalization of LL-37 and mitochondria. Fig. S14. ROS induced by LL-37 in BL cells. Fig. S15. Expression of antiapoptotic BCL-2 family proteins in BL cells. Fig. S16. Cathelicidin mediating vitamin D–induced cytotoxicity of M2 macrophages. Fig. S17. Time course of macrophage-mediated cytotoxicity. Fig. S18. Phenotype of M2 macrophages after vitamin D treatment. Fig. S19. VDR, CYP27B1, and CYP24A1 expression in vitamin D–treated healthy volunteers.
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Published 8 April 2015, Sci. Transl. Med. 7, 282ra47 (2015) DOI: 10.1126/scitranslmed.aaa3230
The PDF file includes:
Materials and Methods Fig. S1. M2-like phenotype of TAMs in BL. Fig. S2. Cytokine profile in lymph node sections. Fig. S3. Phenotype of generated M1 and M2 macrophages. Fig. S4. Activation of M1 and M2 macrophages after exposure to Raji targets. Fig. S5. Analysis of effector molecules secreted by macrophages. Fig. S6. Expression of TNFR1, CD95, DR4, and DR5 on BL cell lines. Fig. S7. Phagocytosis of BL cells. Fig. S8. Dose-dependent cytotoxicity of LL-37 for BL Raji cells. Fig. S9. Expression of “LL-37 receptors” on BL cell lines and proliferating B cells. Fig. S10. Cytotoxic activity of LL-37 counteracted by overexpression of BCL-2. Fig. S11. LL-37 targeting mitochondria of BL cells. Fig. S12. Z-stack analysis of colocalization of LL-37 and mitochondria. Fig. S13. Colocalization of LL-37 and mitochondria. Fig. S14. ROS induced by LL-37 in BL cells. Fig. S15. Expression of antiapoptotic BCL-2 family proteins in BL cells. Fig. S16. Cathelicidin mediating vitamin D–induced cytotoxicity of M2 macrophages. Fig. S17. Time course of macrophage-mediated cytotoxicity. Fig. S18. Phenotype of M2 macrophages after vitamin D treatment. Fig. S19. VDR, CYP27B1, and CYP24A1 expression in vitamin D–treated healthy volunteers.
Fig. S20. Cell sorting strategy to obtain TAMs and lymphoma cells. Reference (50)
Supplementary Materials (SM)
Materials and Methods
Study design
This study focused on the impact of vitamin D on macrophage-mediated cytotoxic activity
against high-grade B cell lymphomas. The objective of the study was to demonstrate why
macrophage-mediated cytotoxicity is absent in Burkitt´s lymphoma and to show that vitamin
D alters macrophages towards more cytotoxicity by the expression of cathelicidin. Therefore,
Burkitt´s lymphoma samples were analyzed by immunohistochemistry and quantitative RT-
PCR based on sample availability at our institution. Further in vitro experiments on
cytotoxicity of generated macrophages against Burkitt´s lymphoma cells demonstrated the
critical importance of vitamin D with regard to the induction of cathelicidin and provided the
rationale for the vitamin D supplementation of healthy individuals with vitamin D deficiency.
Healthy volunteers with vitamin D deficiency were treated with 40,000 units of vitamin D3
weekly over a period of 6 weeks to normalize vitamin D serum levels and to demonstrate
vitamin D-induced expression of cytotoxic effector molecules in macrophages. The treatment
of healthy volunteers was approved by the ethic committee “Ärztekammer des Saarlandes”
file 227/12. Analysis was performed after treatment of 5 healthy individuals. Analysis
included cell culture and flow cytometric analysis of peripheral blood mononuclear cells and
quantitative RT-PCR analysis before and after treatment with vitamin D. Treatment of further
healthy individuals was terminated due to significance of the results. Mechanistic studies
elucidating the effect of cathelicidin on BL cell lines were performed in vitro on cells from
healthy blood donors without blinding or randomization after informed consent. The number
of replicates of each experiment is indicated for each experiment in the respective figure
legend.
Cell culture reagents
Cells were cultured in RPMI 1640 medium (Biochrom) supplemented with glutamine (2 mM;
Sigma), 10 mM HEPES, 13 mM NaHCO3, 100 µg/ml streptomycin, 60 µg/ml penicillin (all
from Biochrom), and 10% human AB serum (PAN Biotech) (complete medium, CM). For
culture of lymphoma cell lines, human AB serum was replaced by 10% FCS (Sigma).
Concentration of 25D in human serum was 70 nmol/L, and the 1,25D3 concentration was 0.1
nmol/L, as determined by CLIA (Synlab). The same batch of human serum was used
throughout the study. For experiments in which 25D-sufficient (25D ≈ 100 nmol/L) and
deficient sera (25D ≤ 40 nmol/L) were compared, pooled human serum was collected as
described previously (12)
Cell lines
Mycoplasma detection was performed monthly in our institution on all cell lines currently in
use. All lines were repeatedly tested mycoplasma negative.
Tissue
Paraffin-embedded specimens of Burkitt´s lymphomas (n=9) and of reactive
lymphadenopathies (n=9) were selected from the archive of the Institute of Pathology,
University Hospital Erlangen, Germany. BL were classified according to the WHO
classification 2008. One case showed BCL-2 expression in single tumor cells. One case
showed some cellular pleomorphism but a marker profile reminiscent of BL and a “starry
sky” pattern, so that it was included in the group of B-cell lymphoma, unclassifiable, with
features intermediate between DLBCL and BL. Tissue was used in accordance with a general
statement of our local ethical board on the use of tissue from the archive of the Institute of
Pathology. In some cases, not enough material was available for histology or isolation of
RNA of required quality. Therefore, 8 cases were used for histology in fig. S1C and vitamin
D metabolism analysis by RT-PCR, and 7-8 cases were used for cytokine analysis (fig. S2).
Antibodies and reagents
The following antibodies were used for immunofluorescence, flow cytometry or western blot:
and extracellular acidification rate (ECAR, indicator of glycolytic activity) were detected.
Next, OCR and ECAR response towards the application of different concentrations of
synthetic LL-37 was evaluated during a period of four hours. Untreated cells receiving only
medium served as controls.
LL-37-TAMRA and MitoSox staining
Cell lines were incubated with LL-37-TAMRA (2.5 µM) for 4 hours at 37°C, washed in pre-
warmed PBS, and mitochondria were stained with MitoTracker Green (100 µM) for 30
minutes at 37°C. Hoechst 33258 (1 µg/ml, blue) was added for nuclear staining for the final
10 min. of incubation. After a washing step, cells were immediately analyzed by fluorescence
microscopy. Cell lines were incubated with synthetic LL-37 (2.5 µM) for 24 hours in the
presence or absence of N-acetyl-L-cysteine (10 mM, NAC) at 37°C. Mitochondrial
superoxides were detected by MitoSox (100 µM), according to the manufacturer’s
instructions, and viability of the cell lines was determined by 7AAD exclusion using flow
cytometry.
Stimulation of P493-6 cells and B cells
P493-6 cells were treated with tetracycline (10 nM) for 24 hours. Cells were harvested and
cell cycle was analyzed as described above. In other experiments, cells were treated with
synthetic LL-37 (2.5 µM) for 24 h, and the viability was measured by 7AAD staining and
flow cytometry. Isolated B cells were incubated in round-bottom microplates (96-well) with
Pokeweed mitogen (10 µg/ml) for 72 h, and the cell cycle was evaluated. In some
experiments, synthetic LL-37 (2.5 µM) was added after 24 hours, and the viability was
measured after further 48 h, by 7AAD exclusion.
Cell cycle analysis
Cell cycle analysis was performed using an apoptosis, DNA damage, and cell proliferation kit
(BD Biosciences) following the manufacturer’s instructions. Briefly, cells were pulsed with
BrdU for the final hour of culture and stained with 7-AAD as well as antibodies against
H2AX and cleaved PARP, and subsequently fixed. Cells were then evaluated using multicolor
flow cytometry (FACS Canto II, BD Biosciences). First, acquired events were gated on
forward and side scatter to separate cells from debris, and the cellular events were further
analyzed based on their BrdU and 7-AAD levels. This BrdU/7-AAD-based gating strategy
allows a separation into three cell-cycle phases: S-phase (BrdU+ cells), G0G1-phase (BrdU-/7-
AAD - cells), and G2M phase (BrdU-/7-AAD+ cells).
Western Blot and Dot Blot
To lyse cells, we used modified RIPA buffer (50 mM Tris-HCl (Roth), pH 7.4; 1% NP-40
(Fluka); 0.25% sodium deoxycholate (Fluka); 150 mM NaCl (Roth); 1 mM EDTA) and
protease inhibitor cocktail tablets (Roche). Cell debris were removed by centrifugation
(14.000 rpm, 10 min), and protein content in the supernatant was determined (BCA protein
assay, Pierce). Lysates were boiled for 10 min in Laemmli sample buffer (1% (w/v) SDS
(Sigma); 4 mM urea (Roth); 80 mM Tris-HCl, pH 6.8; 0.1% (w/v) bromophenol blue
(Sigma)) and analyzed by SDS-PAGE (16%) and western blot. The membranes were
incubated with an anti-VDR antibody (1:2000), an anti-CYP27B1 or anti-actin antibody
(1:1000) (all from Santa Cruz), and incubated with donkey anti-rabbit IgG-HRP (1:1000)
(Jackson ImmunoResearch Laboratories) or anti-mouse IgG-HRP (1:5000) (Invitrogen).
Proteins were detected by chemiluminiscence (Amersham Biosciences) following the
manufacturer’s protocol.
For dot blot analysis, 1 x 105 M1 or M2 macrophages were incubated with BL Raji cells (E/T
= 5:1) for 24 h in a 24-well plate, and supernatants (500 µL) were collected thereafter. M1
macrophages were incubated with buffer as a negative control. For positive control, M1
macrophages were treated with phorbol-12-myristate-13-acetate (PMA, 100 ng/ml) for 24 h.
Supernatants were concentrated 10-fold by lyophilisation (Lyovac GT 2, Leybold-Heraeus),
and protein content in the supernatant was determined by BCA protein assay. Lysates were
loaded onto a nitrocellulose membrane, and anti-cathelicidin (clone: 3D11, Hycult Biotech,
1:500) was diluted in 5% nonfat milk and 3% BSA in PBS. After washing and incubation
with the species-specific, HRP-conjugated secondary Ab (Sigma), immunoreactive proteins
were detected by chemiluminescence (Amersham Biosciences) following the manufacturer’s
protocol.
1,25D3 or BXL-628 treatment
Generated M1 and M2 macrophages (1x105) were activated with different concentrations of
1,25D3 or BXL-628 (1x10-7, 1x10-8, and 1x10-9) for 24 hours. For the qPCR, macrophages
were treated as described above. For the cytotoxic assay, cells were harvested with EDTA,
washed, and co-incubated in round-bottom microplates (96-well) (48 h, 37°C) with BL Raji
target cells in various E/T ratios (1:1, 5:1, and 10:1). Non-adherent cells were harvested and
stained with a CD11b antibody (to exclude macrophage contamination). Viability of CD11b-
cells was determined by Annexin-V and 7AAD staining.
Vitamin D treatment of healthy volunteers
Otherwise healthy volunteers with vitamin D deficiency (< 10 ng/ml) were supplemented with
40000 IE units of vitamin D weekly. Blood was drawn from these individuals for isolation of
peripheral blood mononuclear cells before and after 6 weeks of vitamin D supplementation.
All participants gave written informed consent for blood collection. This part of the study was
approved by the local Ethic committee “Ärztekammer des Saarlandes” file 227/12.
ADCC with rituximab
Monocytes from healthy donors before and after vitamin D supplementation were isolated and
differentiated to M2 macrophages (in the presence of autologous serum, 50%) as described
above. Raji cells were incubated with rituximab (1 µg/ml) for 30 min at 4°C, washed, and co-
incubated with M2 macrophages in round-bottom microplates (96-well) (24 h, 37°C) in
various E/T ratios (1:1, 5:1, and 10:1). In experiments using frozen samples from patients
with high-grade lymphoma, isolated TAMs were treated with 1,25D3 (10-7 M) for 24 h,
washed, and incubated with autologous lymphoma cells in round-bottom microplates (96-
well) in the presence or absence of rituximab (1 µg/ml) (48 h, 37°C). Non-adherent cells were
harvested and stained with an anti-CD11b antibody (to exclude macrophage contamination).
Viability of CD11b- cells was determined by Annexin-V and 7AAD staining.
Statistical analysis
Comparisons between patients and controls were done with nonparametric Mann-Whitney U-
test, and two-tailed Student’s t-tests were used for all other figures. The results are presented
as mean ± standard error of the mean (SEM). Differences were considered significant if
p<0.05.
Figure S1
M2-like phenotype of TAMs in BL. (A) Infiltration of CD68+ cells (macrophages) or (B) CD163+ cells (M2 macrophages) was quantified in reactive lymph nodes (control, n=9) and BL (n=9). Numbers of positive cells per mm² in the area with the densest infiltration were evaluated using the image analysis software BZ-9000 (Keyence). (C) Lymph node sections of the control group or BL patients were stained with anti-CD206 (mannose-receptor, M2 marker) and anti-iNOS (nitric oxide synthase, M1 marker) (n=8). Scale bar = 200 µm.
Figure S2
Cytokine profile in lymph node sections. qPCR analysis of coding RNA for IFNγ, IL4, IL10, and M-CSF isolated from paraffin-embedded tissues (control: benign reactive lymph nodes, n=8; BL: lymph node sections of BL patients, n=7).
Figure S3
Phenotype of generated M1 and M2 macrophages. (A) Expression of surface markers CD68, CD163, HLA-DR, CD11b, CD206 and transcription factors IRF5 and IRF4 by flow cytometry. (B) ELISA quantitation of cytokines (IL12, IL10, TNF) in the supernatant after activation with LPS (100 ng/ml for 48 h) (M1 upper panel, M2 lower panel). Histograms show representative results from 5 independent experiments. The bar graphs show average concentrations (pg/ml, n=5). (C) Secretion of B cell activating factor (BAFF) and a proliferation-inducing ligand (APRIL) by M1 or M2 macrophages was evaluated by ELISA. Error bars show SEM (n=5).
Figure S4
Activation of M1 and M2 macrophages after exposure to Raji targets. (A) M1 and M2 macrophages were incubated with Alexa647-labeled BL Raji cells (red) (E:T = 5:1) for 4 h in an 8-chamber slide. Macrophages were stained with an anti-phospho-tyrosine antibody (green) and analyzed by fluorescence microscopy (DAPI, nuclei, blue; DIC: differential interference contrast). Photographs show representative areas from one out of four independent experiments performed with different donors. Scale bar: 10 µm. (B) M1 or M2 macrophages were incubated with BL Raji cells (E:T = 5:1) for 24 h. PMA (100 ng/ml)-exposed cells were used as a positive control. Macrophages (CD11b+) were analyzed for their CD107a expression by flow cytometry. Concentration of 25D in the medium used in A and B was ≈ 70 nmol/L. The histograms show a representative result from 3 independent experiments.
Figure S5
Analysis of effector molecules secreted by macrophages. (A) Expression of FasL and TRAIL on M1 and M2 macrophages was analyzed by flow cytometry (M1 gray, M2 black line). Histograms show representative results from 5 independent experiments. (B) Bars show average mean fluorescence intensity (MFI) of 5 independent experiments. (C) Expression of gp91-phox (subunit of the NADPH oxidase) and ROS (DCF used as an indicator for reactive oxygen) production in M1 and M2 macrophages was evaluated by flow cytometry. The graphs show average MFI of 5 independent experiments. (D) Secretion of TNF after activation of M1 or M2 macrophages with LPS (100 ng/ml for 48 h) or after co-culture with Raji targets (5:1) was quantified by ELISA (M1 gray bar, M2 black bar). (E) Effect of TNF on viability of Jurkat cells (TNF-sensitive) or Raji cells was measured by Annexin-V/7-AAD staining by flow cytometry after 24 hours. The graph shows the average result of five independent experiments.. Error bars show SEM.
Figure S6
Expression of TNFR1, CD95, DR4, and DR5 on BL cell lines. Expression of TNF receptor 1 (TNFR1), CD95 (Fas), death receptor 4 (DR4), and death receptor 5 (DR5) was analyzed by flow cytometry (specific antibody gray, isotype control black line) on BL30, BL41, BL70, and Raji cells. Histograms show representative results from 5 independent experiments.
Figure S7
Phagocytosis of BL cells. (A) M1 or M2 macrophages were cocultured with various CFSE-labeled BL cell lines for 24 hours (E:T 10:1). Macrophages (CD11b+) were harvested, and the percentage of macrophages with phagocytic activity (CD11b+ and CFSE+) was analyzed by flow cytometry. Scatter plots show representative results from 5 independent experiments. (B) Bar graphs show mean percentage of phagocytic M1 (gray) or M2 (black) macrophages (CD11b+ and CFSE+) compiled from 5 independent experiments. Concentration of 25D in the media used in A and B was ≈ 70 nmol/L. Error bars show SEM.
Figure S8
Dose-dependent cytotoxicity of LL-37 for BL Raji cells. The effect of synthetic LL-37 (black square) or a scrambled peptide control (open square) on viability of BL Raji cells was measured by Annexin-V/7-AAD staining and flow cytometry after 24 hours. The graph shows average viability combined from 5 independent experiments. Error bars show SEM.
Figure S9
Expression of “LL-37 receptors” on BL cell lines and proliferating B cells. (A) Expression of formyl peptide receptor 1 (fMLP), P2X7R, and insulin-like growth factor 1 receptor (IGF-1R) on BL Raji, BL30, BL41, BL70 and on M2 macrophages was analyzed by flow cytometry (specific antibody gray, isotype control black line). (B) Receptor expression on P493-6 cells in the presence or absence of tetracycline (10 nM) or on normal B cells after stimulation with pokeweed mitogen. Histograms show representative results from 4 independent experiments. (C) Bars show average mean fluorescence intensity (MFI) of 4 independent experiments. Error bars show SEM.
Figure S10
Cytotoxic activity of LL-37 counteracted by overexpression of BCL-2. (A) Murine lymphoma cell lines 291PC or 291PC-BCL-2 (overexpressing BCL-2) were treated with LL-37 (2.5 µM, 24 h), and viability was analyzed by flow cytometry (7-AAD exclusion). Representative histogram of 1 out of 4 independent experiments. (B) Compilation of 4 independent experiments. The graph shows the cytotoxicity of LL-37 relative to the untreated control (n=4). Error bars show SEM.
Figure S11
LL-37 targeting mitochondria of BL cells. B cells from healthy donors or BL30 or BL41 cells were incubated with synthetic LL-37-TAMRA (2.5 µM, red) for 4 h, and mitochondria were stained with MitoTracker Green (100 µM, green). Hoechst 33258 (1 µg/ml, blue) was added for nuclear staining. Scale bar: 10 µm. Photographs show representative slides from three independent experiments.
Figure S12
Z-stack analysis of colocalization of LL-37 and mitochondria. Confocal z-stack analysis indicated that LL-37-TAMRA (red) predominantly colocalizes with the mitochondria labeled with the marker HSP60 (green) in Raji cells. Z-stacks of 8.03 µm thickness (0.4 µm intervals) were acquired with a LSM 510. Scale bar: 10 µm.
Figure S13
Colocalization of LL-37 and mitochondria. Colocalization of LL-37-TAMRA (red, upper panel) or a scrambled peptide (red, lower panel, used as control) with the mitochondrial marker HSP60 (green) in BL Raji cells. Cells were treated with LL-37-TAMRA or the scrambled control peptide (both 2.5 µM). Raji cells were stained with anti-HSP60, anti-rabbit Alexa 647 antibodies, and Hoechst nuclear dye. Slides were analyzed by confocal laser microscopy and evaluated for co-localization of LL-37-TAMRA/control peptide and HSP60. Photographs show representative slides from three independent experiments. Scale bar: 10 µm.
Figure S14
ROS induced by LL-37 in BL cells. (A) Mitochondrial superoxides were detected by MitoSox (100 µM), and (B) viability of cell lines was determined by 7-AAD exclusion using flow cytometry. The histograms show representative results from 1 out of 4 independent experiments.
Figure S15
Expression of antiapoptotic BCL-2 family proteins in BL cells. Protein expression of anti-apoptotic BCL-2 family proteins in western blot analysis of various BL cell lines (BL30, BL41, BL70, and Raji). Total protein extracts from the cell lines were analyzed by western blot for BCL-2, MCL-1, BCL-xl, and β-actin expression. The blot shows a representative result from 3 independent experiments.
were treated for 2 days with 1,25D3 or BXL-628 (10-7 M, 10
-8 M, and 10
-9 M), and cathelicidin (red)
expression was analyzed by fluorescence microscopy. A minimum of 100 macrophages was analyzed by fluorescence microscopy. Scale bar: 10 µm. (B) M2 macrophages were incubated for 2 days with
1,25D3 (10-7 M, control) or BXL-628 (10
-7 M, control) and subsequently cocultured with BL Raji
target cells at an E:T ratio of 5:1 for 48 h in the presence or absence of a monoclonal anti-cathelicidin antibody (10 µg/ml) or an isotype control (IgG1, 10 µg/ml). Viability of Raji cells (gated CD11b-) was determined by Annexin-V/7-AAD staining and flow cytometry. The graph shows percent killing of BL Raji cells (CD11b- and 7-AAD+) calculated relative to the untreated control (n=10). Error bars
show SEM. (C) BL Raji cells were incubated for 4 days with 1,25D3 or BXL-628 (10-7 M, 10
-8 M, 10
-9
M). Viability of the lymphoma cells was determined with Annexin-V/7-AAD staining by flow cytometry. The graph shows percent killing of BL Raji cells (Annexin-V+ and 7-AAD+ cells) relative to the untreated control (n=5). Error bars show SEM. Concentration of 25D in the media used in A-C was ≈ 70 nmol/L.
Figure S17
Time course of macrophage-mediated cytotoxicity. Raji cells were incubated alone or in the presence of M1 (A) or M2 (B) macrophages (pretreated with or without 1,25D3) at a 5:1 E/T ratio for 24, 48, 72, and 120 hours (96 well plates, round bottom). Concentration of 25D in the medium was ≈ 70 nmol/L. Viability of Raji cells (gated on CD11b-) was determined by Annexin-V/7-AAD staining with flow cytometric analysis. Error bars show the SEM. Decreasing viability in the control group (black circles, Raji alone) at 120 h was due to consumption of medium.
Figure S18
Phenotype of M2 macrophages after vitamin D treatment. In vitro generated M2 macrophages
(n=6) were treated for 48 hours with 1,25D3 (10-7 M) and analyzed for (A) the macrophage marker
CD68, (B) for M1 markers (cathelicidin, IRF5, IL12,) or (C) for M2 markers (CD163, CD206, IRF4, and IL10) by quantitative real-time PCR. Concentration of 25D in the medium was ≈ 70 nmol/L. M1 macrophages were used as a positive control for M1 markers and as a negative control for M2 markers. The graphs show the average x-fold mRNA expression of vitamin D-treated samples compared with untreated M2 macrophages from 6 independent donors. Error bars show SEM.
Figure S19
VDR, CYP27B1, and CYP24A1 expression in vitamin D–treated healthy volunteers. Monocytes were isolated before and after vitamin D supplementation, differentiated to M2 macrophages, and VDR, CYP27B1, and CYP24A1 expression was determined by quantitative real-time PCR. Concentration of 25D in the medium was ≈ 70 nmol/L.
Figure S20
Cell sorting strategy to obtain TAMs and lymphoma cells. TAMs (CD163+/CD15-) and lymphoma B cells (NHL cells, CD20+) were isolated from bone marrow of NHL patients using a FACS Aria cell sorter (BD).