title: Reduced expression of SETD2 and SNX9 proteins in chemically induced mammary tumorigenesis in Wistar rats: a prognostic histological and proteomic study.
abstract: Breast cancer is a major global health concern, appealing for precise prognostic approaches. Thus, the need is to have studies focusing on the identification and recognition of preliminary events leading to the disease. The present study reports the tracing of precancerous progression and serum proteomic analysis in a breast cancer model developed as a result of 7,12-dimethylbenz[a]anthracene (DMBA) administration. Mammary gland histological changes of prime importance were examined by histopathology, and immunohistochemical analysis with Ki-67 was performed to monitor enhanced cell proliferation, right from the onset of hyperplasia till neoplasia. Serum proteomics (one-dimensional (1D) and two-dimensional (2D) electrophoresis, followed by MALDI-TOF MS characterization) was performed to decipher the differentially expressed serum proteins in animals undergoing tumorigenesis vis-à-vis controls. The significance of our study lies in reporting the significantly reduced expression of two proteins: histone-lysine N-methyltransferase (SETD2) and sorting nexin-9 (SNX9) at very early stage (13 weeks) of tumorigenesis, while the full-fledged tumors developed after 6 months. The reduced expression of SETD2 and SNX9 was validated by western blotting and relative expression analysis using quantitative real-time PCR. These proteins may hence prove as potentially useful tools in search for prognostic markers for the early detection of mammary cancer.
authors.affiliation: Department of Biotechnology, Faculty of Science, Hamdard University (Jamia Hamdard), New Delhi, 110062, India.
authors.forename: Ishfaq Ahmad
authors.initials: IA
authors.lastname: Ganaie
authors.affiliation: Molecular Diagnostics, Genetix Biotech Asia, New Delhi, 110015, India.
authors.forename: Samar Husain
authors.initials: SH
authors.lastname: Naqvi
authors.affiliation: Department of Biochemistry, Hamdard Institute of Medical Sciences and Research, Hamdard University (Jamia Hamdard), New Delhi, 110062, India.
authors.forename: Swatantra Kumar
authors.initials: SK
authors.lastname: Jain
authors.affiliation: Department of Biotechnology, Faculty of Science, Hamdard University (Jamia Hamdard), New Delhi, 110062, India. swajid@jamiahamdard.ac.in.
authors.forename: Saima
authors.initials: S
authors.lastname: Wajid
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene / Q000633:toxicity; D000818:Animals; D063646:Carcinogenesis / Q000139:chemically induced / Q000473:pathology*; D049109:Cell Proliferation / Q000187:drug effects; D005260:Female; D011495:Histone-Lysine N-Methyltransferase / Q000096:biosynthesis*; D008321:Mammary Glands, Animal / Q000473:pathology*; D015674:Mammary Neoplasms, Animal / Q000139:chemically induced / Q000473:pathology*; D040901:Proteomics; D051381:Rats; D017208:Rats, Wistar; D060888:Real-Time Polymerase Chain Reaction; D058305:Sorting Nexins / Q000096:biosynthesis*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D058305:Sorting Nexins; D015127:9,10-Dimethyl-1,2-benzanthracene; D011495:Histone-Lysine N-Methyltransferase
keywords: Breast cancer; Ki-67; Preneoplasia; SETD2; SNX9; Wistar rat