The Association of Micro-RNA 21 and Hypertension: A Meta-Analysis

Area of Science:

• Cardiovascular Research
• Molecular Biology
• Biomarker Discovery

Background:

• Hypertension is a complex disease with significant morbidity and mortality.
• The role of micro-RNA 21 (miR-21) in hypertension is controversial, with conflicting study results.
• Existing research lacks a definitive conclusion on the association between miR-21 expression and hypertension.

Purpose of the Study:

• To statistically evaluate miR-21 levels in patients diagnosed with hypertension.
• To resolve the controversy surrounding the relationship between miR-21 expression and hypertension.
• To determine if miR-21 serves as a potential biomarker for hypertension.

Main Methods:

• A comprehensive literature search was performed across major databases: Web of Science, Embase, PubMed, and CNKI.
• Keywords used included 'hypertension' combined with 'miR-21,' 'microRNA-21,' or 'miRNA-21'.
• A meta-analysis was conducted using standardized mean differences (SMD) and 95% confidence intervals (CIs) on data from 12 selected articles (546 cases, 436 controls).

Main Results:

• The meta-analysis included 12 studies comprising 546 hypertension cases and 436 controls.
• Results demonstrated a statistically significant increase in miR-21 levels in hypertensive patients compared to healthy controls (SMD: 1.22; 95% CI [0.35, 2.09]).
• This is the first meta-analysis specifically evaluating miR-21 levels in the context of hypertension.

Conclusions:

• Micro-RNA 21 (miR-21) levels are significantly elevated in patients with hypertension.
• miR-21 shows potential as a novel target for the prediction and therapeutic intervention of hypertension.
• Further high-quality research is warranted to solidify the association between miR-21 and hypertension.