Related Experiment Video

Updated: Mar 3, 2026

miRNA Expression Analyses in Prostate Cancer Clinical Tissues
11:29

miRNA Expression Analyses in Prostate Cancer Clinical Tissues

Published on: September 8, 2015

11.3K

miR-34a inhibits cell proliferation in prostate cancer by downregulation of SIRT1 expression

Kun Duan1, Yong-Chao Ge1, Xue-Pei Zhang2

  • 1Department of Urology Surgery, The Third People's Hospital of Zhengzhou, Zhengzhou, Henan, P.R. China.

Oncology Letters
|January 2, 2016
PubMed

Insights

MicroRNA-34a (miR-34a), a tumor suppressor, inhibits prostate cancer growth by downregulating SIRT1. Reduced miR-34a levels in tumors suggest its critical role in cancer progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • MicroRNA-34a (miR-34a) acts as a tumor suppressor, inhibiting abnormal cell growth.
  • The specific role of miR-34a in regulating sirtuin 1 (SIRT1) within prostate cancer is not fully understood.

Purpose of the Study:

  • To investigate the biological function and molecular mechanisms of miR-34a in regulating SIRT1 in human prostate cancer.
  • To analyze miR-34a and SIRT1 expression in prostate cancer tissues and cell lines.

Main Methods:

  • Reverse transcription-quantitative polymerase chain reaction (RT-qPCR) to measure miR-34a expression.
  • Western blotting and Cell Counting Kit-8 (CCK-8) to assess SIRT1 regulation and cell growth.
  • Flow cytometry to analyze cell cycle arrest in PC-3 cells.

Main Results:

  • miR-34a expression was significantly reduced in prostate cancer tissues compared to normal tissues.
  • Overexpression of miR-34a in PC-3 cells led to decreased SIRT1 expression.
  • miR-34a overexpression inhibited PC-3 cell proliferation and induced cell cycle arrest.

Conclusions:

  • miR-34a functions as a tumor suppressor in human prostate cancer.
  • miR-34a inhibits prostate cancer cell proliferation, partly by downregulating SIRT1 expression.
Keywords:
cell proliferationhuman prostate cancer cellmicroRNA-34asirtuin 1

More Related Videos

An Orthotopic Murine Model of Human Prostate Cancer Metastasis06:48

An Orthotopic Murine Model of Human Prostate Cancer Metastasis

Published on: September 18, 2013

36.0K
MicroRNA Detection in Prostate Tumors by Quantitative Real-time PCR qPCR08:30

MicroRNA Detection in Prostate Tumors by Quantitative Real-time PCR qPCR

Published on: May 16, 2012

25.1K

Related Concept Videos

MicroRNAs01:22

MicroRNAs

MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
24.4K
MicroRNAs01:22

MicroRNAs

MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
4.2K
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
5.3K
Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
38.7K
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
6.1K
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
5.0K