Regulation of human osteocalcin promoter in hormone-independent human prostate cancer cells

Fan Yeung, Wai K. Law, Ching Hua Yeh, Jennifer J Westendorf, Ye Zhang, Ruoxiang Wang, Chinghai Kao, Leland W K Chung

Research output: Contribution to journalArticle

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Abstract

Osteocalcin (OC) is a small (6 kDa) polypeptide whose expression was thought to be limited to mature osteoblasts. The discovery of OC expression in prostate cancer specimens led us to study the regulation of OC gene in androgen-independent metastatic human prostate PC3 cells. An 800-bp human OC (hOC) promoter-luciferase construct exhibited strong basal and vitamin D-induced activity in OC-positive human prostate and osteosarcoma cell lines. Through deletion analysis of the hOC promoter, the functional hierarchy of the cis-acting elements, OSE1, OSE2, and AP-1/VDRF, was established in PC3 cells (OSE1 > AP-1/VDRE > OSE2). By juxtaposing dimers of these 3 cis-elements, we produced a minimal hOC promoter capable of displaying high tissue specific activity in prostate cancer cells. Our study demonstrated three groups of transcription factors, Runx2, JunD/Fra-2, and Sp1, responsible for the high hOC promoter activity in PC3 cells by binding to the OSE2, AP-1/VDRE, and OSE1 elements, respectively. Among the three groups of transcription factors, the expression levels of Runx2 and Fra-2 are higher in the OC-positive PC3 cells and osteoblasts, compared with the OC-negative LNCaP cells. Interestingly, unlike the mouse OC promoter, the OSE1 site in hOC promoter is regulated by members of Sp1 family instead of the osteoblast-specific factor Osf1. The molecular basis for androgen-independent prostate cancer cells behaving like mature osteoblasts may be explained by the interplay and coordination of these transcription factors under the tight regulation of autocrine and paracrine mediators.

Original languageEnglish (US)
Pages (from-to)2468-2476
Number of pages9
JournalJournal of Biological Chemistry
Volume277
Issue number4
DOIs
StatePublished - Jan 25 2002
Externally publishedYes

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Osteocalcin
Prostatic Neoplasms
Cells
Hormones
Osteoblasts
Transcription Factor AP-1
Transcription Factors
Androgens
Prostate
Osteosarcoma
Luciferases
Vitamin D
Dimers
Genes
Tissue
Cell Line
Peptides

ASJC Scopus subject areas

  • Biochemistry

Cite this

Regulation of human osteocalcin promoter in hormone-independent human prostate cancer cells. / Yeung, Fan; Law, Wai K.; Yeh, Ching Hua; Westendorf, Jennifer J; Zhang, Ye; Wang, Ruoxiang; Kao, Chinghai; Chung, Leland W K.

In: Journal of Biological Chemistry, Vol. 277, No. 4, 25.01.2002, p. 2468-2476.

Research output: Contribution to journalArticle

Yeung, Fan ; Law, Wai K. ; Yeh, Ching Hua ; Westendorf, Jennifer J ; Zhang, Ye ; Wang, Ruoxiang ; Kao, Chinghai ; Chung, Leland W K. / Regulation of human osteocalcin promoter in hormone-independent human prostate cancer cells. In: Journal of Biological Chemistry. 2002 ; Vol. 277, No. 4. pp. 2468-2476.
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abstract = "Osteocalcin (OC) is a small (6 kDa) polypeptide whose expression was thought to be limited to mature osteoblasts. The discovery of OC expression in prostate cancer specimens led us to study the regulation of OC gene in androgen-independent metastatic human prostate PC3 cells. An 800-bp human OC (hOC) promoter-luciferase construct exhibited strong basal and vitamin D-induced activity in OC-positive human prostate and osteosarcoma cell lines. Through deletion analysis of the hOC promoter, the functional hierarchy of the cis-acting elements, OSE1, OSE2, and AP-1/VDRF, was established in PC3 cells (OSE1 > AP-1/VDRE > OSE2). By juxtaposing dimers of these 3 cis-elements, we produced a minimal hOC promoter capable of displaying high tissue specific activity in prostate cancer cells. Our study demonstrated three groups of transcription factors, Runx2, JunD/Fra-2, and Sp1, responsible for the high hOC promoter activity in PC3 cells by binding to the OSE2, AP-1/VDRE, and OSE1 elements, respectively. Among the three groups of transcription factors, the expression levels of Runx2 and Fra-2 are higher in the OC-positive PC3 cells and osteoblasts, compared with the OC-negative LNCaP cells. Interestingly, unlike the mouse OC promoter, the OSE1 site in hOC promoter is regulated by members of Sp1 family instead of the osteoblast-specific factor Osf1. The molecular basis for androgen-independent prostate cancer cells behaving like mature osteoblasts may be explained by the interplay and coordination of these transcription factors under the tight regulation of autocrine and paracrine mediators.",
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