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Long noncoding RNA MALAT-1 is a new potential therapeutic target for castration resistant prostate cancer

Shancheng Ren1, Yawei Liu, Weidong Xu

  • 1Department of Urology, Shanghai Changhai Hospital, Second Military Medical University, Shanghai, People's Republic of China.

The Journal of Urology
|July 13, 2013
PubMed
Abstract

Insights

Metastasis-associated long noncoding RNA 1 (MALAT-1) is upregulated in prostate cancer and drives tumor progression. Silencing MALAT-1 inhibits cancer growth and metastasis, suggesting it as a therapeutic target for castration-resistant prostate cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Prostate cancer remains a significant health concern, with castration-resistant prostate cancer (CRPC) posing a therapeutic challenge.
  • Long noncoding RNAs (lncRNAs) are increasingly recognized for their roles in cancer development and progression.
  • Metastasis-associated long noncoding RNA 1 (MALAT1) is a lncRNA implicated in various cancers, but its specific role in prostate cancer requires further elucidation.

Purpose of the Study:

  • To investigate the expression levels of MALAT1 in prostate cancer tissues and cell lines.
  • To evaluate the therapeutic potential of MALAT1 silencing in CRPC models.
  • To explore the impact of MALAT1 on prostate cancer cell proliferation, migration, invasion, and cell cycle progression.

Main Methods:

  • Quantitative reverse transcriptase-polymerase chain reaction (qRT-PCR) was employed to assess MALAT1 expression.
  • Small interfering RNA (siRNA) targeting MALAT1 was designed and validated for silencing efficiency.
  • In vitro assays included cell counting, colony formation, scratch, Transwell invasion, and flow cytometry for cell cycle analysis.
  • In vivo studies involved intratumoral delivery of MALAT1-targeting siRNA in a CRPC xenograft mouse model.

Main Results:

  • MALAT1 was significantly upregulated in prostate cancer tissues and cell lines, correlating with higher Gleason scores, PSA levels, tumor stage, and CRPC.
  • MALAT1 silencing inhibited prostate cancer cell proliferation, migration, and invasion, while inducing G0/G1 cell cycle arrest in CRPC cells.
  • Intratumoral administration of MALAT1 siRNA delayed tumor growth, reduced metastasis, and prolonged survival in CRPC xenograft models.

Conclusions:

  • MALAT1 plays a crucial role in maintaining prostate cancer tumorigenicity and progression.
  • MALAT1 is identified as a potential therapeutic target for managing castration-resistant prostate cancer.
  • Targeting MALAT1 with siRNA demonstrates therapeutic efficacy in preclinical models of CRPC.
Keywords:
CCK-8CRPCCell Counting Kit-8LNCaP-AILNCaP-androgen independent subtypeM5M9MALAT-1MALAT-1 siRNA-5MALAT-1 siRNA-9MALAT1 long non-coding RNAPBSPCRPSARNART-PCRantiandrogenscastration resistant prostate cancerhumanlncRNAlong noncoding RNAmetastasis associated in lung adenocarcinoma transcript 1phosphate buffered salinepolymerase chain reactionprostateprostate specific antigenprostatic neoplasmsreverse transcriptase-PCRsmall interfering

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