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May 16, 2026Journal of Clinical Medicine of KazakhstanOpen Access

COVID-19 vaccination was not associated with a statistically significant difference in venous tissue ACE2 mRNA expression between patients with cardiovascular disease and healthy controls.

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Why the study?

The potential effects of COVID-19 vaccines on ACE2 gene expression in individuals with pre-existing cardiac disease remain incompletely understood.

Does COVID-19 vaccination alter ACE2 gene expression in cardiac patients compared with healthy controls?

Population

90 participants (47 healthy controls and 43 patients with confirmed heart disease)

Comparison

Cardiac patients vs healthy controls after COVID-19 vaccination

Design

Comparative observational study

Key result

COVID-19 vaccination was not associated with a statistically significant difference in venous tissue ACE2 mRNA expression between patients with cardiovascular disease and healthy controls.

Authors

NSNabaa Shihab ShihabHÇHavva ÇobanoğullarıAIAya Badeea Ismail

Discussion

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Member takes

Overview

No ACE2 expression change in vaccinated CVD patients suggests no immediate clinical concern; leaves open prospective studies on tissue-specific effects.

Study Design

Type

Observational (n=90)

Multicenter

No

Structured PICO

Does COVID-19 vaccination alter ACE2 gene expression in cardiac patients compared with healthy controls?

P
Population
90 vaccinated individuals, comprising 43 patients with cardiovascular disease and 47 healthy controls, evaluated for venous tissue ACE2 gene expression.
E
Exposure
COVID-19 vaccination
C
Comparator
Healthy controls
O
Outcome
ACE2 mRNA expression levels in venous tissuesurrogate

Main Result

p-value: p=>0.05

COVID-19 vaccination does not appear to significantly alter ACE2 gene expression in venous tissue of patients with cardiovascular disease compared to healthy controls.

Limitations

  • Lack of post-vaccination time stratification
  • High inter-individual variability in ACE2 expression
  • Retrospective and observational design limits causal inference
  • Use of a single reference gene (ACTB)
  • Lack of stratification by vaccine type
  • Small sample size
  • Single-center design
  • Cross-sectional design lacking longitudinal follow-up

Cite This Study

Shihab et al. (2026) conducted an observational in Cardiovascular disease (n=90). Cardiovascular disease vs. Healthy controls was evaluated on Normalized ACE2 mRNA expression in venous tissue (p=>0.05). COVID-19 vaccination was not associated with a statistically significant difference in venous tissue ACE2 mRNA expression between patients with cardiovascular disease and healthy controls.

synapsesocial.com/papers/6a98fd3eee2e02d2bfe109e8https://doi.org/10.23950/jcmk/18567
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Also Consider

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  1. 1Angiotensin converting enzyme 2 level and its significance in COVID‐19 and other diseases patients2022 · 4 citations
  2. 2Angiotensin-Converting Enzyme Inhibitor/Angiotensin II Receptor Blocker Treatment and Haemodynamic Factors are Associated with Increased Cardiac mRNA Expression of Angiotensin-Converting Enzyme 2 in Patients with Cardiovascular Disease2020 · 17 citations
  3. 3Systematic identification of ACE2 expression modulators reveals cardiomyopathy as a risk factor for mortality in COVID-19 patients2022 · 28 citations
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  5. 5Expression of ACE2, Soluble ACE2, Angiotensin I, Angiotensin II and Angiotensin-(1-7) Is Modulated in COVID-19 Patients2021 · 105 citations