Identification of genes differentially expressed in benign prostatic hyperplasia

Area of Science:

• Molecular Biology
• Urology
• Genetics

Background:

• Benign prostatic hyperplasia (BPH) is a common condition in aging men.
• Understanding gene expression differences between normal and hyperplastic prostate tissue is crucial for identifying disease-related genes.
• mRNA expression analysis offers a pathway to discover candidate genes involved in BPH pathogenesis.

Purpose of the Study:

• To identify differentially expressed genes in benign prostatic hyperplasia (BPH) using a cDNA subtraction technique.
• To investigate the role of novel and known genes in the development of BPH.
• To characterize the expression pattern of a highly upregulated gene, NELL2, in prostate tissue.

Main Methods:

• Employed a cDNA subtraction procedure involving solution hybridization of BPH cDNA against normal prostate cDNA.
• Utilized sequence and database analysis to identify genes from subtracted cDNAs.
• Confirmed mRNA over-expression using Northern blotting and determined cellular localization via in situ hybridization.

Main Results:

• Identified several known, EST, and novel genes differentially expressed in BPH.
• Discovered significant upregulation of a sequence identified as human NELL2 mRNA.
• NELL2 mRNA expression was predominantly localized to basal cells of the prostate epithelium in hyperplastic specimens.

Conclusions:

• NELL2, a gene encoding a protein with epidermal growth factor-like domains, is overexpressed in BPH and may function as a novel prostatic growth factor.
• The specific localization of NELL2 mRNA in basal epithelial cells suggests a role in prostate epithelial homeostasis.
• Altered NELL2 expression levels could contribute to the epithelial-stromal imbalances observed in BPH.