Supplementary Materials and Methods Cell culture

Supplementary Materials and Methods

Cell culture

Cells were cultured in DMEM (Sigma Aldrich, Taufkirchen, Germany) supplemented with 10% heat-inactivated endotoxin tested fetal calf serum (FCS, Cambrex, Verviers, Belgium), 100 U/ml penicillin, 100 μg/ml streptomycin, 1 mM sodium pyruvate, and 2 mM L-alanyl-L-glutamine. Normal exocervical keratinocytes (NECK) were isolated from hysterectomy specimens by enzymatic digestion and cultured in KBM Gold medium (Lonza, Basel, Switzerland). Mycoplasma testing was performed monthly.

Immunohistochemical and Immunofluorescence analysis

Two-micrometer thick sections fixed on microslides were deparaffinized with xylene and hydrated using a diluted alcohol series. For immunhistochemistry sections were incubated with citrate buffer (10 mM, pH 7.0), for immunofluorescence in TE buffer (10mM Tris, 1mM EDTA pH9,0) and cooked for 10 min or 20 min, respectively for antigen retrieval and immersed in 3% H₂O₂ in TBS (50 mM Tris-HCl, 150 mM NaCl, pH 7.6) to block endogenous peroxidase activity. To reduce non-specific staining, each section was treated with 2.5% normal horse serum for 30min. Goat anti-CCL20 polyclonal antibody AF360 (1:100, R&D Systems, South Beloit, IL), mouse anti--smooth muscle actin (-SMA) monoclonal antibody 1A4 (1:500, Dako, Hamburg, Germany), rabbit anti IL-17 polyclonal antibody (1:1000, Abcam, Cambridge, UK), mouse anti-CD4 monoclonal antibody 4B12 (1:500, Leica Biosystems, Wetzlar, Germany) and mouse anti-CCR6 monoclonal antibody (1:1000, R&D Systems, South Beloit, IL) were used. For immunohistochemistry ImmPRESS Detection Kit (Vector Laboratories, Burlingame, USA) were used. For immunofluorescence Biotinylated Horse Anti-Mouse IgG with DyLight488 (Vector Laboratories) and TSA™ Kit #13, with HRP-Goat Anti-Rabbit IgG and Alexa Fluor® 546 Tyramide (Life Technology, Darmstadt, Germany) were used according to the manufactures instructions. Slides were evaluated with a DMI 6000B microscope (Leica, Wetzlar, Germany) and Microsoft Image Composite Editor program using standardized settings. To evaluate the number of infiltrating Th17 cells biopsies were co-stained for CD4 and IL-17 or CCR6 and IL-17. Five randomized pictures (200x) were taken per biopsy and the number of CD4/IL-17- or CCR6/IL-17-positive cells was counted.

Generation of conditioned media

For conditioned media cells were cultured at a density of 1 x 10⁶/ml. After 24 h, fresh RPMI1640 medium (Sigma) plus supplements (10% heat-inactivated endotoxin-tested fetal calf serum (FCS; Cambrex, Verviers, Belgium), 100 U/ml penicillin, 100µg/ml streptomycin and 1mM sodium pyruvate) was added. Conditioned media were collected 24 h later.

Table 1: List of used antibodies.

Antigen/Protein	Clone, Catalogue Nr.	Dilution/ concentration	Vendor	References
rabbit anti IL-17 polyclonal antibody	ab79056	1:1000 for IHC (Fig.1)	Abcam, Cambridge, UK	(1)
goat anti-CCL20 polyclonal antibody	AF360, AF360	1:100 for IHC (Fig.1) 1 µg/ml for neutralization (Fig.6)	R&D Systems, South Beloit, IL	(2)
normal Goat IgG Control	AB-108-C	1 µg/ml for neutralization (Fig.6)	R&D Systems, South Beloit, IL	(2)
mouse anti--smooth muscle actin (-SMA) monoclonal antibody	1A4, M085101-2	1:500 for IHC (Fig.2)	Dako, Hamburg, Germany	(3)
rabbit anti-C/EBP	C-19, sc-150X	1:250 for IF (Fig.3) 1:5000 for WB (Fig.3 and 4)	Santa Cruz Biotechnology, Heidelberg, Germany)	(2)
mouse anti-vimentin	V9, M072501-2	1:250 for IF (Fig.3)	Dako, Hamburg, Germany	(4)
mouse anti-human IL-6 monoclonal antibody	6708, MAB206	10 µg/ml for neutralization (Fig.5 and 6)	R&D Systems, South Beloit, IL	(5)
isotype (IgG1) control antibody	11711, MAB002	10 µg/ml for neutralization (Fig.5 and 6)	R&D Systems, South Beloit, IL	(2), (5)
mouse anti -actin	AC-15, A5441	1:5000 for WB (Fig.3 and 4)	Sigma-Aldrich, Taufkirchen, Germany	(6)
anti-CD4-FITC	RPA-T4, 555346	5µl per test (Fig.6)	BD Biosciences, Heidelberg, Germany	(7)
anti-CCR6-Alexa Fluor647	11A9, 560466	10µl per test (Fig.6)	BD Biosciences, Heidelberg, Germany	(2)
anti-CCR6 antibody	53103, MAB195	50 µg/ml for blocking (Fig.6)	R&D Systems, South Beloit, IL	(2)
anti-rabbit FITC	111-095-003	1:800 for IF (Fig.3)	Dianova, Hamburg, Germany	(2)
anti-mouse TRITC	115-025-003	1:800 for IF (Fig.3)	Dianova, Hamburg, Germany	(2)
mouse anti-CD4 monoclonal antibody	4B12, CD4-368-L-CE-H	1:500 for IF (Fig.1)	Leica Biosystems, Wetzlar, Germany	(8)
normal goat IgG	sc-2028	1:100 for IHC (Fig.1)	Santa Cruz Biotechnology, Heidelberg, Germany)	(9)
normal rabbit IgG	sc-2027	1:1000 for IF (Fig.1)	Santa Cruz Biotechnology, Heidelberg, Germany)	(9)
normal mouse IgG	sc-2025	1:500 in IF (Fig.1)	Santa Cruz Biotechnology, Heidelberg, Germany)	(9)

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