The more severely inflamed thyroids (4–5+ severity scores) also had microabscess formation, necrosis, and focal fibrosis, and inflammation generally extended beyond the thyroid to involve adjacent muscle and connective tissue.1–5,19 G-EAT lesions in IFN-γ−/− MAPK inhibitor mice with 4–5+ severity scores differed from those

in WT mice in that they generally had less fibrosis and minimal necrosis and lesions generally did not extend outside the thyroid. G-EAT lesions in IFN-γ−/− mice had very few neutrophils, but many eosinophils.6–8 Neutrophils were detected in frozen thyroid sections using a rat anti-neutrophil monoclonal antibody (mAb) (RB6-8C5; American Type Culture Collection, Rockville, MD).6,20 Frozen thyroid sections were fixed in acetone for 10 min at 4°. Goat anti-rat antibody (1 : 500; Caltag Laboratories, Burlingame, CA) was used as the secondary antibody, with 3-diaminobenzidine tetrahydrochloride (DAB; Sigma) as the chromogen. Slides were counterstained with haematoxylin. Rat IgG was used as a negative control and staining was always negative. The same method was used for IL-5 staining except that the primary antibody was rabbit anti-IL-5 polyclonal Ab

(Santa Cruz Biotechnology, JAK inhibitor review Santa Cruz, CA) and anti-rabbit IgG (Santa Cruz) was used as the secondary antibody. NovaRED (Vector Laboratories, Burlingame, CA) was used as the chromogen. Serum T4 levels were determined using a T4 enzyme immunoassay kit (Biotecx Labs, Houston, TX) according to the manufacturer’s instructions. Results are expressed

as μg T4/dl of serum. Using this assay, T4 values for normal mouse serum ranged from 4 to 10 μg/dl; values < 3 μg/dl are considered low.20 RNA was isolated from individual thyroid lobes of recipient mice using Trizol (Invitrogen, Carlsbad, CA) and reverse transcribed as previously NADPH-cytochrome-c2 reductase described.20–22 Levels of IL-10, IL-17, chemokine (C-X-C motif) ligand 1 (CXCL1) and chemokine (C-C motif) ligand 11 (CCL11) were quantified by real-time PCR using the MyiQ Single-Color Real-Time PCR Detection System (Bio-Rad Laboratories, Hercules, CA). Amplification was performed in a total volume of 25 μl for 40 cycles, and product was detected using SYBR Green (ABgene, Rochester, NY). Samples were run in triplicate and relative expression levels were determined by normalizing expression of each target to hypoxanthine-guanine phosphoribosyl transferase. Expression levels of normalized samples are shown as relative expression units. Real-time PCR primers for IL-10 and IL-17 were previously described.22,23 Primers for CXCL1 were: sense, 5′-TGCACCCAAACCGAAGTCAT-3′; antisense, 5′-TTGTCAGAAGCCAGCGTTGAC-3′; and for CCL11, they were: sense, 5′-CTGCTTGATTCCTTCTCTTTCCTAA-3′; antisense, 5′-GGAACTACATGAAGCCAAGTCCTT-3′. Experiments were repeated at least three times.