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Circulating miRNA - Biomarker and Clinical Significance

Circulating miRNAs are small RNA molecules found in the blood that can serve as biomarkers for diseases such as cancer or cardiovascular conditions.

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Things worth knowing about "Circulating miRNA"

Circulating miRNAs are small RNA molecules found in the blood that can serve as biomarkers for diseases such as cancer or cardiovascular conditions.

What are Circulating miRNAs?

Circulating miRNAs (short for microRNAs) are small, non-coding ribonucleic acid molecules that circulate freely in human blood and other body fluids such as saliva, urine, or cerebrospinal fluid. They typically consist of approximately 18 to 25 nucleotides and are actively or passively released by cells throughout the body. Unlike many other RNA molecules, circulating miRNAs are remarkably stable because they are often packaged inside small membrane vesicles called exosomes or bound to protein complexes such as Argonaute proteins, which protect them from enzymatic degradation.

Biological Function

MicroRNAs play a central role in gene regulation. They bind to the messenger RNA (mRNA) of target genes and either inhibit their translation into proteins or trigger mRNA degradation. In this way, they control key cellular processes such as cell growth, cell division, apoptosis (programmed cell death), and differentiation. A single miRNA molecule can regulate the expression of hundreds of different genes, which underlines its enormous biological significance.

Circulating miRNAs can also act as signaling molecules between different tissues, enabling long-distance cell-to-cell communication throughout the body.

Clinical Importance as Biomarkers

One of the most active research areas is the use of circulating miRNAs as biomarkers for various diseases. Since the miRNA profile in the blood changes with certain conditions, characteristic patterns can indicate the presence of a disease. Key research areas include:

Oncology (Cancer): Tumor-specific miRNAs can be detected in the blood before clinical symptoms appear, opening up possibilities for early cancer detection in lung, breast, or colorectal cancer.
Cardiovascular Diseases: After a heart attack, specific miRNAs (e.g., miR-208) are released from damaged heart muscle tissue and can be measured in the bloodstream.
Neurological Disorders: Changes in miRNA profiles are being studied in conditions such as Alzheimer's disease and Parkinson's disease.
Metabolic Diseases: Altered miRNA patterns are observed in type 2 diabetes mellitus and non-alcoholic fatty liver disease (NAFLD).
Inflammatory and Autoimmune Diseases: Certain miRNAs are dysregulated in conditions such as rheumatoid arthritis and systemic lupus erythematosus.

Diagnostic Methods

Several molecular biology techniques are used to detect and quantify circulating miRNAs:

Quantitative Real-Time PCR (qRT-PCR): Considered the gold standard for sensitive and specific measurement of individual miRNAs.
Next-Generation Sequencing (NGS): Enables simultaneous analysis of the entire miRNA profile (mirnome) of a sample.
Microarray Analysis: Allows parallel investigation of many miRNAs, although it is increasingly being replaced by NGS.

Samples are usually obtained through a simple blood draw, which is why circulating miRNAs are referred to as a liquid biopsy. This minimally invasive approach is considered a major advantage over conventional tissue biopsies.

Challenges and Limitations

Despite their great potential, significant challenges remain for the clinical application of circulating miRNAs:

Lack of standardization in sample collection, processing, and measurement methods
Variability in miRNA levels due to time of day, physical activity, and other physiological factors
Hemolysis (destruction of red blood cells) during sample collection can distort results
Limited specificity: many miRNAs are altered in several different diseases

Nevertheless, research is advancing rapidly, and the first circulating miRNA-based diagnostic tests are already being evaluated in clinical settings.

Therapeutic Potential

Beyond their role as biomarkers, miRNAs are also being investigated as therapeutic targets. Approaches include inhibiting disease-promoting miRNAs using synthetic inhibitors called antagomirs, or restoring the function of tumor-suppressive miRNAs using miRNA mimics. Phase I and II clinical trials are evaluating miRNA-based therapies for conditions including liver cancer and heart failure.

References

Schwarzenbach H., Nishida N., Calin G. A., Pantel K.: Clinical relevance of circulating cell-free microRNAs in cancer. Nature Reviews Clinical Oncology, 2014.
Mitchell P. S. et al.: Circulating microRNAs as stable blood-based markers for cancer detection. Proceedings of the National Academy of Sciences (PNAS), 2008.
World Health Organization (WHO): Biomarkers in Risk Assessment -- Validity and Validation. Environmental Health Criteria 222, WHO Press, 2001.

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