title: Primary cell cultures from human renal cortex and renal-cell carcinoma evidence a differential expression of two spliced isoforms of Annexin A3.
abstract: Primary cell cultures from renal cell carcinoma (RCC) and normal renal cortex tissue of 60 patients have been established, with high efficiency (more than 70%) and reproducibility, and extensively characterized. These cultures composed of more than 90% of normal or tumor tubular cells have been instrumental for molecular characterization of Annexin A3 (AnxA3), never extensively studied before in RCC cells although AnxA3 has a prognostic relevance in some cancer and it has been suggested to be involved in the hypoxia-inducible factor-1 pathway. Western blot analysis of 20 matched cortex/RCC culture lysates showed two AnxA3 protein bands of 36 and 33 kDa, and two-dimensional Western blot evidenced several specific protein spots. In RCC cultures the 36-kDa isoform was significantly down-regulated and the 33-kDa isoform up-regulated. Furthermore, the inversion of the quantitative expression pattern of two AnxA3 isoforms in tumor cultures correlate with hypoxia-inducible factor-1alpha expression. The total AnxA3 protein is down-regulated in RCC cultures as confirmed also in tissues by tissue microarray. Two AnxA3 transcripts that differ for alternative splicing of exon III have been also detected. Real-time PCR quantification in 19 matched cortex/RCC cultures confirms the down-regulation of longer isoform in RCC cells. The characteristic expression pattern of AnxA3 in normal and tumor renal cells, documented in our primary cultures, may open new insight in RCC management.
authors.affiliation: Department of Experimental Medicine, University of Milano-Bicocca, 20052 Monza, Italy.
authors.forename: Cristina
authors.initials: C
authors.lastname: Bianchi
authors.forename: Silvia
authors.initials: S
authors.lastname: Bombelli
authors.forename: Francesca
authors.initials: F
authors.lastname: Raimondo
authors.forename: Barbara
authors.initials: B
authors.lastname: Torsello
authors.forename: Valentina
authors.initials: V
authors.lastname: Angeloni
authors.forename: Stefano
authors.initials: S
authors.lastname: Ferrero
authors.forename: Vitalba
authors.initials: V
authors.lastname: Di Stefano
authors.forename: Clizia
authors.initials: C
authors.lastname: Chinello
authors.forename: Ingrid
authors.initials: I
authors.lastname: Cifola
authors.forename: Lara
authors.initials: L
authors.lastname: Invernizzi
authors.forename: Paolo
authors.initials: P
authors.lastname: Brambilla
authors.forename: Fulvio
authors.initials: F
authors.lastname: Magni
authors.forename: Marina
authors.initials: M
authors.lastname: Pitto
authors.forename: Gianpaolo
authors.initials: G
authors.lastname: Zanetti
authors.forename: Paolo
authors.initials: P
authors.lastname: Mocarelli
authors.forename: Roberto A
authors.initials: RA
authors.lastname: Perego
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017318:Annexin A3 / Q000096:biosynthesis*; D002292:Carcinoma, Renal Cell / Q000378:metabolism*; D015536:Down-Regulation; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D000860:Hypoxia; D007672:Kidney Cortex / Q000378:metabolism / Q000473:pathology*; D007680:Kidney Neoplasms / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D020033:Protein Isoforms
chemical_list: D020033:Protein Isoforms; D017318:Annexin A3