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Differential expression of the human kallikrein gene 14 (KLK14) in normal and cancerous prostatic tissues.
Prostate 2003; 56(4):287-92P

Abstract

BACKGROUND

Many members of the human kallikrein gene family are differentially expressed in cancer and a few have potential as diagnostic/prognostic markers. KLK14 is a newly discovered human kallikrein gene that is mainly expressed in the central nervous system and endocrine tissues. Since KLK14 was found to be regulated by steroid hormones in prostate cancer cell lines, we hypothesized that it will be differentially expressed in prostate cancer tissues compared to their normal counterparts.

METHODS

Matched prostate tissue samples from the cancerous and non-cancerous parts of the same prostates were obtained from 100 patients who underwent radical prostatectomy. Quantitative analysis of KLK14 expression levels were performed by real-time RT-PCR using SYBR Green I dye on the LightCycler trade mark system. Associations with clinico-pathological parameters were analyzed.

RESULTS

KLK14 overexpression in the cancerous compared to non-cancerous tissue was found in 74% of patients (P < 0.001). Mean level of expression was 154 arbitrary units (Au) in cancerous tissues and 14.2 Au in the non-cancerous tissues. The ratio of the cancerous to non-cancerous KLK14 expression values was higher in patients with late stage (stage III) compared to stage II (P = 0.002), and in grade 3 compared to grade 1/2 tumors (P = 0.001). A statistically significant increase was also observed in patients with higher in Gleason score (>6) compared to Gleason score = 6 tumors (P = 0.027). No correlation was found between KLK14 tissue expression levels and serum prostate-specific antigen.

CONCLUSIONS

KLK14 expression is significantly higher in cancerous compared to non-cancerous prostatic tissue. The up-regulation of the KLK14 gene in advanced and more aggressive tumors may indicate a possible role for the hK14 protein in tumor spread and opens the possibility of hK14 being a candidate new marker for prostate cancer diagnosis and prognosis.

Authors+Show Affiliations

Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Canada.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

12858357

Citation

Yousef, George M., et al. "Differential Expression of the Human Kallikrein Gene 14 (KLK14) in Normal and Cancerous Prostatic Tissues." The Prostate, vol. 56, no. 4, 2003, pp. 287-92.
Yousef GM, Stephan C, Scorilas A, et al. Differential expression of the human kallikrein gene 14 (KLK14) in normal and cancerous prostatic tissues. Prostate. 2003;56(4):287-92.
Yousef, G. M., Stephan, C., Scorilas, A., Ellatif, M. A., Jung, K., Kristiansen, G., ... Diamandis, E. P. (2003). Differential expression of the human kallikrein gene 14 (KLK14) in normal and cancerous prostatic tissues. The Prostate, 56(4), pp. 287-92.
Yousef GM, et al. Differential Expression of the Human Kallikrein Gene 14 (KLK14) in Normal and Cancerous Prostatic Tissues. Prostate. 2003 Sep 1;56(4):287-92. PubMed PMID: 12858357.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Differential expression of the human kallikrein gene 14 (KLK14) in normal and cancerous prostatic tissues. AU - Yousef,George M, AU - Stephan,Carsten, AU - Scorilas,Andreas, AU - Ellatif,Mohamed Abd, AU - Jung,Klaus, AU - Kristiansen,Glen, AU - Jung,Monika, AU - Polymeris,Mary-Ellen, AU - Diamandis,Eleftherios P, PY - 2003/7/15/pubmed PY - 2003/9/17/medline PY - 2003/7/15/entrez SP - 287 EP - 92 JF - The Prostate JO - Prostate VL - 56 IS - 4 N2 - BACKGROUND: Many members of the human kallikrein gene family are differentially expressed in cancer and a few have potential as diagnostic/prognostic markers. KLK14 is a newly discovered human kallikrein gene that is mainly expressed in the central nervous system and endocrine tissues. Since KLK14 was found to be regulated by steroid hormones in prostate cancer cell lines, we hypothesized that it will be differentially expressed in prostate cancer tissues compared to their normal counterparts. METHODS: Matched prostate tissue samples from the cancerous and non-cancerous parts of the same prostates were obtained from 100 patients who underwent radical prostatectomy. Quantitative analysis of KLK14 expression levels were performed by real-time RT-PCR using SYBR Green I dye on the LightCycler trade mark system. Associations with clinico-pathological parameters were analyzed. RESULTS: KLK14 overexpression in the cancerous compared to non-cancerous tissue was found in 74% of patients (P < 0.001). Mean level of expression was 154 arbitrary units (Au) in cancerous tissues and 14.2 Au in the non-cancerous tissues. The ratio of the cancerous to non-cancerous KLK14 expression values was higher in patients with late stage (stage III) compared to stage II (P = 0.002), and in grade 3 compared to grade 1/2 tumors (P = 0.001). A statistically significant increase was also observed in patients with higher in Gleason score (>6) compared to Gleason score = 6 tumors (P = 0.027). No correlation was found between KLK14 tissue expression levels and serum prostate-specific antigen. CONCLUSIONS: KLK14 expression is significantly higher in cancerous compared to non-cancerous prostatic tissue. The up-regulation of the KLK14 gene in advanced and more aggressive tumors may indicate a possible role for the hK14 protein in tumor spread and opens the possibility of hK14 being a candidate new marker for prostate cancer diagnosis and prognosis. SN - 0270-4137 UR - https://www.unboundmedicine.com/medline/citation/12858357/Differential_expression_of_the_human_kallikrein_gene_14__KLK14__in_normal_and_cancerous_prostatic_tissues_ L2 - https://doi.org/10.1002/pros.10263 DB - PRIME DP - Unbound Medicine ER -