Impact of pregnancy-related heart failure on humoral immunity: clinical relevance of G3-subclass immunoglobulins in peripartum cardiomyopathy.
BACKGROUND
The impact and clinical relevance of pregnancy-related heart failure (HF) on humoral immunity are not known. Heart failure is often characterized by immunoglobulins (Ig) that differ in subclass profile with etiology. Subclass immunoglobulins differ in the biologic information they confer in disease. Therefore, given that progressive gestation is associated with immunologic incompetence, we sought to study the relative impact of pregnancy-related onset of HF on humoral immunity.


METHODS
Immunoglobulins (class G and subclasses G1, G2, G3) against cardiac myosin were evaluated in 47 patients with peripartum cardiomyopathy (PPCM) from different global regions: South Africa (n = 15), Mozambique (n = 9), and Haiti (n = 23) and compared with healthy mothers and patients with idiopathic dilated cardiomyopathy (DCM). C-reactive protein, tumor necrosis factor-alpha, and Fas-Apo-1 were also studied in PPCMs.


RESULTS
All PPCM groups were similar in Ig profiles. The immunoglobulins, frequencies and reactivities, were markedly and nonselectively raised in PPCM patients compared with DCM. Immunoglobulin frequencies in PPCMs, Haiti: G1 58%, G2 66%, G3 54%; Mozambique: G1 77%, G2 66%, G3 66%; and South Africa: G1 47%, G2 53%, G3 53%, were higher compared with DCMs from South Africa (n = 24): G1 8%, G2 8%, G3 21%, or the United Kingdom (n = 68): G1 10%, G2 8.8%, G3 22% (P < .0001). Hence, unlike the selective up-regulation of immunoglobulins of the G3 subclass (IgG3s) in DCM, class G and all subclass immunoglobulins were raised in PPCM. Of the serological variables, IgG3s (immunoglobulins with proinflammatory characteristics) discriminated NYHA functional status at diagnosis. IgG3-positive patients were in a higher NYHA class at initial presentation (P < .05).


CONCLUSIONS
Immunoglobulin subclass profiles in patients with HF differ with etiology. Unlike DCM, the impact of pregnancy-related HF on humoral immunity is not subclass-restricted. However, raised levels of IgG3s may be of prognostic value in clinical PPCM.
Warraich
Rahat S
RS
Department of Cardiothoracic Surgery, National Heart and Lung Institute, Imperial College School of Medicine, Royal Brompton and Harefield Trust, Harefield Hospital, Middlesex, England, UK. rwarraich@lycos.com
Sliwa
Karen
K
Damasceno
Albertino
A
Carraway
Robert
R
Sundrom
Bruce
B
Arif
Gulnaz
G
Essop
Raffique
R
Ansari
Aftab
A
Fett
James
J
Yacoub
Magdi
M
D000328:Adult; D001323:Autoantibodies / Q000276:immunology*; D001324:Autoantigens / Q000276:immunology*; D002097:C-Reactive Protein / Q000032:analysis; D024722:Cardiac Myosins / Q000276:immunology*; D009202:Cardiomyopathies / Q000097:blood / Q000000981:diagnostic imaging / Q000209:etiology / Q000276:immunology*; D002311:Cardiomyopathy, Dilated / Q000097:blood / Q000000981:diagnostic imaging / Q000276:immunology; D015331:Cohort Studies; D005260:Female; D006205:Haiti; D006333:Heart Failure / Q000097:blood / Q000000981:diagnostic imaging / Q000209:etiology / Q000276:immunology*; D006801:Humans; D007121:Immunocompetence; D007074:Immunoglobulin G / Q000096:biosynthesis* / Q000097:blood / Q000145:classification / Q000276:immunology; D007132:Immunoglobulin Isotypes / Q000096:biosynthesis* / Q000097:blood / Q000276:immunology; D009073:Mozambique; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular / Q000097:blood / Q000000981:diagnostic imaging / Q000276:immunology*; D011644:Puerperal Disorders / Q000276:immunology*; D012720:Severity of Illness Index; D013019:South Africa; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis; D014463:Ultrasonography; D019014:fas Receptor / Q000032:analysis
D001323:Autoantibodies; D001324:Autoantigens; D007074:Immunoglobulin G; D007132:Immunoglobulin Isotypes; D014409:Tumor Necrosis Factor-alpha; D019014:fas Receptor; D002097:C-Reactive Protein; D024722:Cardiac Myosins