Related Experiment Video

Updated: Mar 31, 2026

MicroRNA Detection in Prostate Tumors by Quantitative Real-time PCR qPCR
08:30

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

Published on: May 16, 2012

25.2K

miR-449a enhances radiosensitivity through modulating pRb/E2F1 in prostate cancer cells

Aihong Mao1,2,3,4, Yang Liu1,5,6, Yali Wang1,5,6

  • 1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, People's Republic of China.

Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
|November 2, 2015
PubMed

Insights

MicroRNA-449a (miR-449a) enhances prostate cancer cell sensitivity to X-ray radiation by promoting cell cycle arrest and apoptosis. This tumor suppressor regulates the Rb/E2F1 pathway, impacting radiosensitivity.

Area of Science:

  • Oncology
  • Molecular Biology
  • Radiotherapy

Background:

  • MicroRNA-449a (miR-449a) is a known tumor suppressor implicated in various cancers.
  • Its specific role and molecular mechanisms in response to ionizing radiation (IR) in prostate cancer remain unclear.

Purpose of the Study:

  • To investigate the function of miR-449a in prostate cancer radiosensitivity.
  • To elucidate the molecular mechanisms by which miR-449a affects radiation response, focusing on the pRb/E2F1 pathway.

Main Methods:

  • Overexpression of miR-449a in prostate cancer cell lines (PC-3 and DU-145).
  • Assessment of cell cycle distribution, apoptosis, and radiosensitivity following X-ray irradiation.
  • Analysis of key protein and gene expression, including pRb, E2F1, CDC25A, and HDAC1.

Main Results:

  • miR-449a overexpression enhanced radiation-induced G2/M phase arrest and apoptosis in wild-type Rb PC-3 cells, increasing radiosensitivity.
  • Mutant Rb DU-145 cells showed resistance to X-ray radiation, with miR-449a having no significant effect on cell cycle distribution post-irradiation.
  • Elevated miR-449a downregulated CDC25A and HDAC1, key regulators of cell cycle progression and oncogenesis.

Conclusions:

  • miR-449a acts as a crucial regulator of prostate cancer radiosensitivity by modulating the pRb/E2F1 pathway.
  • The tumor suppressor miR-449a enhances apoptosis and cell cycle arrest, thereby sensitizing prostate cancer cells to ionizing radiation.
Keywords:
ApoptosisG2/M arrestProstate cancerRadiosensitivitymiR-449apRb/E2F1

More Related Videos

miRNA Expression Analyses in Prostate Cancer Clinical Tissues11:29

miRNA Expression Analyses in Prostate Cancer Clinical Tissues

Published on: September 8, 2015

11.3K
Virus Delivery of CRISPR Guides to the Murine Prostate for Gene Alteration06:21

Virus Delivery of CRISPR Guides to the Murine Prostate for Gene Alteration

Published on: April 27, 2018

9.2K

Related Concept Videos

Mitogens and the Cell Cycle02:38

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
8.4K
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...
5.1K
Targeted Cancer Therapies02:57

Targeted Cancer Therapies

The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
There are several types of targeted therapies against...
9.1K
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...
5.4K