Significance of anti-myosin antibody formation in patients with myocardial infarction: a prospective observational study

O'Donohoe, Tom J., Schrale, Ryan G., Sikder, Suchandan, Surve, Nuzhat, Rudd, Donna, and Ketheesan, Natkunam (2019) Significance of anti-myosin antibody formation in patients with myocardial infarction: a prospective observational study. Heart, Lung and Circulation, 28 (4). pp. 583-590.

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Background: Anti-myosin antibodies (AMAs) are often formed in response to myocardial infarction (MI) and have been implicated in maladaptive cardiac remodelling. We aimed to: (1) compare AMA formation in patients with Non-ST-Elevation MI (NSTEMI) and ST-Elevation MI (STEMI); (2) evaluate factors predicting autoantibody formation; and, (3) explore their functional significance.

Methods: Immunoglobulin M (IgM) and Immunoglobulin G (IgG) AMA titres were determined in serum samples collected at admission, 3 and 6 months post MI. The relationship between demographic and clinical data, and antibody formation, was investigated to determine factors predicting antibody formation and functional significance.

Results: Forty-three patients were consecutively recruited; 74.4% were positive for IgM at admission, compared with 23.3% for IgG. Mean IgG levels increased by 1.24% (±0.28) at 3 months, and 13.55% (±0.13) at 6 months post MI. Mean antibody levels were significantly higher in the NSTEMI cohort at both follow-up time points for IgG (p < 0.001, p < 0.0001), but not IgM (p = 0.910, p = 0.066). A moderately positive correlation between infarct size and increase in mean IgM concentration was observed at 3 months (r(98) = 0.455; p = 0.015). Anti-myosin antibody formation was not associated with an unfavourable outcome at follow-up.

Conclusions: Anti-myosin antibodies are formed in a significant proportion of patients following MI, particularly among those with NSTEMI. While IgM levels fall after infarction, IgG levels increase and persist beyond 6 months of follow-up. This raises the possibility that they may contribute to long-term myocardial damage and dysfunction. Future research should focus on the specific epitopes that are targeted by these antibodies, and their functional significance. This may result in the emergence of novel therapies to attenuate cardiac dysfunction in MI patients.

Item ID: 56692
Item Type: Article (Research - C1)
ISSN: 1444-2892
Date Deposited: 16 Oct 2019 01:03
FoR Codes: 32 BIOMEDICAL AND CLINICAL SCIENCES > 3201 Cardiovascular medicine and haematology > 320101 Cardiology (incl. cardiovascular diseases) @ 50%
32 BIOMEDICAL AND CLINICAL SCIENCES > 3202 Clinical sciences > 320202 Clinical chemistry (incl. diagnostics) @ 30%
32 BIOMEDICAL AND CLINICAL SCIENCES > 3204 Immunology > 320405 Humoural immunology and immunochemistry @ 20%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920103 Cardiovascular System and Diseases @ 100%
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