Knockdown of MBP-1 in human prostate cancer cells delays cell cycle progression

Asish K. Ghosh, Robert Steele, Ratna B. Ray

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We have previously shown that MBP-1 acts as a general transcriptional repressor, and forced expression of MBP-1 exerts an anti-proliferative effect on a number of human cancer cells. In this report, we have investigated the role of endogenous MBP-1 in cell growth regulation. For this, we generated human prostate cancer cells (PC3) stably transfected with short hairpin RNA targeting MBP-1.Wehave observed retarded growth and longer doubling time of MBP-1 knockdown PC3 cells as compared with control mock-transfected PC3 cells. Fluorescence-activated cell sorter analysis suggested that PC3 cells expressing MBP-1-specific small interfering RNA accumulated during G2/M phase of the cell cycle. Further analysis suggested that depletion of MBP-1 was associated with reduction of cyclin A and cyclin B1 expression when compared with that of the control cells. A delayed induction of cyclinAand B1 expression was observed in MBP-1-depleted PC3 cells (PC3-4.2) upon serum stimulation, although the level of expression was much lower than that of control PC3 cells. Supplementation of MBP-1 in PC3-4.2 cells restored cyclin A and cyclin B1 expression. Together, these results suggest that knockdown of MBP-1 in prostate cancer cells perturbs cell proliferation by inhibiting cyclin A and cyclin B1 expression.

Original languageEnglish (US)
Pages (from-to)23652-23657
Number of pages6
JournalJournal of Biological Chemistry
Volume281
Issue number33
DOIs
StatePublished - Aug 18 2006
Externally publishedYes

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Prostatic Neoplasms
Cell Cycle
Cyclin B1
Cyclin A
Cells
Small Interfering RNA
Cell proliferation
Cell growth
Fluorescence
G2 Phase
Growth
Cell Division
Cell Proliferation

ASJC Scopus subject areas

  • Biochemistry

Cite this

Knockdown of MBP-1 in human prostate cancer cells delays cell cycle progression. / Ghosh, Asish K.; Steele, Robert; Ray, Ratna B.

In: Journal of Biological Chemistry, Vol. 281, No. 33, 18.08.2006, p. 23652-23657.

Research output: Contribution to journalArticle

Ghosh, Asish K. ; Steele, Robert ; Ray, Ratna B. / Knockdown of MBP-1 in human prostate cancer cells delays cell cycle progression. In: Journal of Biological Chemistry. 2006 ; Vol. 281, No. 33. pp. 23652-23657.
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