Branching activity in the human prostate: a closer look at the structure of small glandular buds.
ABSTRACT Knowledge regarding cell biologic characteristics of small solid glandular buds in the prostate and their relationship with branching activity in the human prostate is still fragmentary. Our object was to demonstrate, on the basis of immunophenotype, loci that harbor the potential for branching activity within the adult human prostate.
Semiserial sectioning was performed on 13 adult prostates in an effort to identify structures in the prostate that could be considered foci of growth. Selected slides were stained with biomarkers for basal/luminal cells (keratins), proliferation (MIB-1), apoptosis inhibitor (bcl-2), intercellular adhesion (E-cadherin), and stromal-epithelial interactions (tenascin-C). Results were compared with fetal and prepubertal human prostates and microdissected rat prostates.
Five histologic epithelial structures were identified in 19 paraffin blocks, which on serial sectioning showed morphologic transitions with a common pattern, consisting of reduction in number and caliber of acini until small solid buds of epithelial cells were reached. Immunophenotypically, the small solid glandular buds had a basal-cell keratin phenotype, expression of bcl-2 in virtually all cells, high proliferative activity, prominent intracellular localization of E-cadherin, and enhanced periglandular tenascin-C immunoreactivity. The budding tips in fetal and prepubertal prostates revealed an immunostaining pattern identical to the small solid glandular buds in the adult, but different to the rat prostate.
Our data suggest that dispersed small solid glandular buds have a capacity for growth, and as such may be considered foci of resumed reawakening branching activity with in the adult human prostate.
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- "(J Histochem Cytochem 55:885–890, 2007) K E Y W O R D S development differentiation human prostate immunohistochemistry tissue array analysis THE ADULT PROSTATE EPITHELIUM is composed of basal and luminal compartments distinguished by localization and immunophenotypic characteristics that reflect their differentiation. Basal cells specifically display a high expression of p63, cytokeratin (CK)5/6 and 14, antiapoptotic factor Bcl2, and epidermal growth factor receptor (EGFR) (McDonnell et al. 1992; De Marzo et al. 1998; Xue et al. 2001a). The basal layer is the proliferative compartment in the normal adult prostate. "
ABSTRACT: An intermediate population has been identified among prostate glands called transiently amplifying (TA) cells, which are characterized by coexpression of basal and luminal cytokeratins (CKs), high proliferation, and lack of p27 expression. These cells are rare in the normal adult prostate and increase in pretumoral conditions, but their importance in the developing gland remains unknown. We analyzed fetal prostates for the expression of CKs (5/6, 18, 19) and factors involved in proliferation and apoptosis: p63, Ki67, p27, epidermal growth factor (EGFR), Bcl2, androgen receptor (AR). Immunostaining was performed on a tissue microarray, including 40 prostates from fetuses aged 13-42 weeks and normal prostate tissue from 10 adults. In both solid buds and the basal compartment of canalized glands, cells expressed p63, CK5/6, CK19, CK18, BCL2, EGFR and were p27 negative. Luminal cells of fetal canalized glands continue to express CK19, EGFR, and BCL2, without p27 expression. In contrast, adult epithelial luminal cells showed diffuse AR and p27 expression, without CK19, BCL2, and EGFR staining. Proliferation was high and diffuse in fetal glands and rare and restricted to basal cells in adult glands. These results indicate that most fetal epithelial prostatic cells exhibit the phenotype of TA cells, suggesting their regulatory function in prostate development.Journal of Histochemistry and Cytochemistry 10/2007; 55(9):885-90. DOI:10.1369/jhc.7A7192.2007 · 2.40 Impact Factor