Pericardial cytokines in neoplastic, autoreactive, and viral pericarditis

Abstract

Pericardial cytokine patterns in various diseases are not well established. We have analyzed pericardial proinflammatory (interleukin (IL)-6 and tumor necrosis factor (TNF)-alpha) and immunoregulatory cytokines (transforming growth factor (TGF)-beta1 and interferon (IFN)-gamma) in patients with pericarditis, myocarditis, and ischemic heart disease. Pericardial fluid was obtained in 30 subsequent patients undergoing pericardiocentesis (Group 1: 60% males, 52.4±14.2years) and in 21 patients during aortocoronary bypass surgery (Group 2: 42.9% males, age 67.2±7.4years). After clinical, laboratory, echocardiography examination, fiberoptic pericardioscopy (Storz-AF1101Bl, Germany) and pericardial/epicardial biopsy Group 1 was subdivided to 40% neoplastic, 36.6% autoreactive, 10% iatrogenic, and 13.3% viral pericarditis. Samples were promptly aliquoted, frozen, and stored at -70°C. The cytokines were estimated using quantikine enzyme amplified-sensitivity immuno-assays (R&D Systems, USA) and the results compared between neoplastic, viral, iatrogenic, and autoreactive pericarditis and surgical groups. IL-6 was significantly increased in PE versus serum in all forms of pericarditis (except in autoreactive) and increased in comparison with pericardial fluid of surgical patients. TNF-alpha was increased only in PE of patients with viral pericarditis in comparison with Group 2. TGF-beta1 was strikingly lower in the PE than in the serum of all pericarditis patients. However, TGF-beta1 levels in PE were significantly higher in Group 1 than in Group 2, except in viral pericarditis. IFN-gamma levels did not significantly differ between PE and serum or in comparison with Group 2. The cytokine pattern "high TNF-alpha/low TGF-beta1" was found in viral pericarditis and low IL-6 in autoreactive PE. Different etiologies of pericardial inflammation did not influence the IFN-gamma levels. IL-6 pericardial to serum ratio was significantly higher in autoreactive PE than in viral and neoplastic forms. However, TNF-alpha and IFN-gamma pericardial to serum ratios were significantly higher in viral than in autoreactive and neoplastic PE.