title: Epidermal growth factor, epidermal growth factor receptor, and transforming growth factor-alpha in human hyperplastic prostate tissue: expression and cellular localization.
abstract: It is widely accepted that polypeptide growth factors are involved in the growth and development of normal and neoplastic human prostate. It has been previously reported that epidermal growth factor (EGF) and insulin-like growth factor I (IGF-I) receptors are present in the human hyperplastic prostate tissue (BPH). To add information on the mechanism of action of EGF and transforming growth factor-alpha (TGF alpha), a peptide correlated to EGF, and the EGF receptor (EGF-R) in the human prostate, we studied the expression and cellular localization of messenger ribonucleic acid (RNA) encoding EGF, EGF-R, and TGF alpha in BPH tissue. Reverse transcriptase-PCR of total RNA extracted from BPH tissues documented the presence of specific transcripts for EGF, EGF-R, and TGF alpha. In situ hybridization with specific RNA probes synthesized from the respective complementary DNA demonstrated that EGF, EGF-R, and TGF alpha messenger RNAs were mainly localized in the epithelial cells. Immunprecipitation and Western blot analysis showed that BPH tissue contained the corresponding proteins, EGF and TGF alpha. Our findings provide additional support for the idea that EGF and TGF alpha may be considered specialized symbols in the language of cell-cell interactions and for the hypothesis that in the human prostate they seem to act in an autocrine fashion.
authors.affiliation: Department of Clinical Physiopathology, University of Florence, Italy.
authors.forename: A
authors.initials: A
authors.lastname: De Bellis
authors.forename: P
authors.initials: P
authors.lastname: Ghiandi
authors.forename: A
authors.initials: A
authors.lastname: Comerci
authors.forename: G
authors.initials: G
authors.lastname: Fiorelli
authors.forename: C
authors.initials: C
authors.lastname: Grappone
authors.forename: S
authors.initials: S
authors.lastname: Milani
authors.forename: R
authors.initials: R
authors.lastname: Salerno
authors.forename: F
authors.initials: F
authors.lastname: Marra
authors.forename: M
authors.initials: M
authors.lastname: Serio
mesh_terms: D004815:Epidermal Growth Factor / Q000235:genetics / Q000378:metabolism; D066246:ErbB Receptors / Q000235:genetics* / Q000378:metabolism; D005260:Female; D015870:Gene Expression; D006801:Humans; D017403:In Situ Hybridization; D007668:Kidney / Q000378:metabolism; D008297:Male; D010920:Placenta / Q000378:metabolism; D016133:Polymerase Chain Reaction; D011247:Pregnancy; D011470:Prostatic Hyperplasia / Q000235:genetics* / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D016211:Transforming Growth Factor alpha / Q000235:genetics* / Q000378:metabolism
chemical_list: D012333:RNA, Messenger; D016211:Transforming Growth Factor alpha; D004815:Epidermal Growth Factor; D066246:ErbB Receptors