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ARTICLE |
Expression of Adrenomedullin and Proadrenomedullin N-terminal 20 Peptide in Human and Rat Prostate
Nuria Jiméneza, Alfonso Calvoa, Alfredo Martínezb, David Rosellc, Frank Cuttittab, and Luis M. Montuengaa,ba Department of Histology and Pathology, University of Navarra, Pamplona, Spain
b Department of Cell and Cancer Biology, National Cancer Institute, Bethesda, Maryland
c Department of Urology, University of Navarra, Pamplona, Spain
Correspondence to: Alfonso Calvo, Dept. of Histology and Pathology, University of Navarra, 31080 Pamplona, Spain.
Adrenomedullin (AM) and proadrenomedullin N-terminal 20 peptide (PAMP) are two recently discovered hypotensive peptides translated from the same message transcript (preproAM mRNA). In this article we report the presence of AM, PAMP, and their mRNA in human and rat prostate and of AM receptor mRNA in rat prostate. PreproAM mRNA was found in the epithelium of normal human and rat prostate glands by in situ hybridization. In humans, it was mainly expressed in the basal cells. In rat, its expression was higher in the ducts than in the acini of all the prostate lobes. Immunocytochemistry identified a similar distribution pattern for AM compared with its mRNA but showed different locations for AM and PAMP immunoreactivity. The former was widespread in the epithelia, whereas the latter was almost exclusively found in neuroendocrine cells. In rat, Western blot analysis confirmed the presence of high levels of AM peptide in the ventral lobe and of its precursor in the ventral and dorsolateral lobes. Immunoreactivity for serotonin, chromogranin A, PAMP, and AM defined four subpopulations of prostate neuroendocrine-like cells in rat, a cell type that has not been previously described. (J Histochem Cytochem 47:1167–1177, 1999)
Key Words: adrenomedullin, proadrenomedullin N-terminal 20 peptide, adrenomedullin receptor, prostate, immunocytochemistry, in situ hybridization, RT-PCR, Western blot
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