ol for mitochondrial content mouse polyclonal antibody specific for SDHA ref. MS203, from Mitosciences, now abcam was used. Previously tested positive controls from thyroid, breast and muscle were included for all the antibodies in the series. Negative controls were carried out by replacing the primary antibody with nonimmune mouse serum. The immunohistochemistry technique was performed using a labeled streptavidin-biotin immunoperoxidase detection system or the Envision G/2 System/AP according to the manufacturer’s instructions. For MFN1 and SDHA the immunohistochemical staining was developed with DAB substrate. For the remaining antibodies the immunostaining was performed with or the Envision G/2 System/AP, and the samples were developed with a permanent red chromogen. Immunostaining was blindly semi-quantitatively evaluated by two observers without knowledge of any clinical information of the cases; an IHC score was obtained through the sum of intensity of staining by the extension of stained tumor cells. Evaluation of the BAY41-2272 site percentage of immunoreactive cells for all the antibodies was made by counting 300 tumor cells in random fields. In all discrepant cases a consensus was reached. As mitochondrial marker, and as a mean to assess the amount of mitochondria, SDHA expression levels were accessed and used to normalize our PubMed ID:http://www.ncbi.nlm.nih.gov/pubmed/19763871 results. In every sample, we compared the expression of the proteins of interest, both in normal and tumor tissue, against SDHA staining. Thus, for each case, we were 4 / 17 Mitochondrial Dynamics in Oncocytic Thyroid Tumors able to evaluate in an individual and precise manner the changes in expression of the protein in the study independently of the amount of mitochondria, indicated by the SDHA expression. Cell lines Thyroid cancer cell lines: TPC1, a PTC-derived cell line, and XTC.UC1, a cell line obtained from an oncocytic variant of follicular carcinoma, were used in this study. Both cell lines had been previously characterized at the molecular and genotypic level. TPC1 cells were cultured with RPMI medium with Glutamax supplemented with 10% fetal bovine serum, 1% Pen Strep and 0.5% fungizone; XTC.UC1 was maintained PubMed ID:http://www.ncbi.nlm.nih.gov/pubmed/19761601 with DMEM/F12 supplemented with 10% FBS, insulin at 10g/mL, TSH at 10mU/mL, 1% Pen Strep and 0.5% fungizone. Both cell lines were authenticated using DNA profile analysis, obtained with the PowerPlex 16 system, according to the DNA profiles available in American Type Culture Collection and Health Science Research Resource Bank. Constructs and transfections Cytoplasmatic GFP, mitochondrially targeted dsRED, mitochondrially targeted YFP and pcDNA3.1-HA-K38A-DRP1 plasmids were previously described and were a gift from T. Pozzan. The empty pcDNA3.1 was obtained from BD-Clontech and pcDNA3.1-HA-K38A-DRP1 plasmid generation was previously described. XTC.UC1 cell lines were transiently transfected by electroporation using the Neon Transfection System. In co-transfections experiments, 1.5g of marker carrier plus 3g of pcDNA 3.1 or pcDNA3.1-HA-K38A-DRP1 were used per 2.0×106 cells. The specific combination of plasmids transfected in each experiment is indicated in the figure legends. After 24h, transfected cells were sorted by FACS and used for experiments 24h later. Quantitative PCR For cDNA preparation, 1ng of 
total RNA was reverse transcribed using the RevertAid first strand cDNA synthesis kit. Reverse transcription products were amplified for all the aforementioned genes by qPCR using TaqMan PCR Master Mix.
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