Related Experiment Video
Updated: Mar 29, 2026
In Vivo Inhibition of MicroRNA to Decrease Tumor Growth in Mice
Published on: August 23, 2019
The tumor-suppressive and potential therapeutic functions of miR-34a in epithelial carcinomas
Brian D Adams1,2, Christine Parsons1, Frank J Slack2
1a Department of Molecular, Cellular and Developmental Biology , Yale University , New Haven , CT , USA.
Introduction:
Many RNA species have been identified as important players in the development of chronic diseases including cancer. Certain classes of regulatory RNAs such as microRNAs (miRNAs) have been investigated in such detail that bona fide tumor suppressive and oncogenic miRNAs have been identified. Because of this, there has been a major effort to therapeutically target these small RNAs. One in particular, a liposomal formulation of miR-34a (MRX34), has entered Phase I trials.
Areas Covered:
This review aims to summarize miRNA biology, its regulation within normal versus disease states and how it can be targeted therapeutically, with a particular emphasis on miR-34a. Understanding the complexity of a single miRNA will aid in the development of future RNA-based therapeutics for a broader range of chronic diseases.
Expert Opinion:
The potential of miRNAs to be developed into anti-cancer therapeutics has become an increasingly important area of research. miR-34a is a tumor suppressive miRNA across many tumor types through its ability to inhibit cellular proliferation, invasion and tumor sphere formation. miR-34a also shows promise within certain in vivo solid tumor models. Finally, as miR-34a moves into clinical trials it will be important to determine if it can further sensitize tumors to certain chemotherapeutic agents.
Insights
MicroRNAs (miRNAs) are key regulators in chronic diseases like cancer. The tumor-suppressive miR-34a, a focus of this review, shows therapeutic potential and is advancing into clinical trials for cancer treatment.
Area of Science:
- Molecular Biology
- Oncology
- RNA Therapeutics
Background:
- Regulatory RNAs, such as microRNAs (miRNAs), play critical roles in the pathogenesis of chronic diseases, including cancer.
- Extensive research has identified specific miRNAs with tumor-suppressive or oncogenic functions, driving therapeutic development.
- The therapeutic targeting of small RNAs, particularly miRNAs, is a rapidly advancing field.
Purpose of the Study:
- To review the fundamental biology of miRNAs.
- To elucidate miRNA regulation in normal and disease states.
- To summarize therapeutic strategies targeting miRNAs, with a specific focus on miR-34a.
Main Methods:
- Literature review of miRNA biology and therapeutic applications.
- Emphasis on miR-34a as a case study for RNA-based therapeutics.
- Analysis of miR-34a's role in cancer and its potential clinical translation.
Main Results:
- miR-34a functions as a tumor suppressor across various cancer types.
- miR-34a inhibits key cancer cell processes, including proliferation, invasion, and tumor sphere formation.
- miR-34a demonstrates efficacy in preclinical in vivo solid tumor models.
Conclusions:
- miRNAs hold significant promise as anti-cancer therapeutics.
- miR-34a is a validated tumor suppressor with potential for clinical application.
- Further clinical investigation of miR-34a is warranted to assess its role in sensitizing tumors to chemotherapy.
Related Concept Videos
01:22MicroRNAs
01:22MicroRNAs
02:38Mitogens and the Cell Cycle
02:23Abnormal Proliferation
01:12Loss of Tumor Suppressor Gene Functions
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
01:12Loss of Tumor Suppressor Gene Functions