Adrenomedullin Proadrenomedullin N-terminal 20 peptide Adrenomedullin receptor Prostate In situ hybridization RT-PCR Western blot
Jimenez N, Calvo A, Martinez A, Rosell D, Cuttitta F, Montuenga LM. Expression of adrenomedullin and proadrenomedullin N-terminal 20 peptide in human and rat prostate. J Histochem Cytochem 1999 Sep;47(9):1167-1178.
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.