Interleukin 6 (IL-6) flats in various materials from patients with sarcoidosis were determined.

Interleukin 6 (IL-6) flats in various materials from patients with sarcoidosis were determined. The enslaves of the study were 38 patients with sarcoidosis and 28 healthy superintends For detection of IL-6, an enzymelinked immunosorbent assay course was used. Interleukin 6 activity in serum was exposeed in 4 of 30 patients, still not in 19 controls. In bronchoalveolar lavage (BAL) fluid, following 20-fold concentration, IL-6 activity was finded in four of ten patients (nonsmokers) and three of seven sways (two of two smokers and the same of five nonsmokers). Interleukin 6 evens in the supernatants of cultur monocytes and alveolar macrophages (AMs) were significantly higher (p<001 and p<001 respectively) in patients with sarcoidosis than in regulates Interleukin 6 production from monocytes guarded to correlate with that from AMs. A significant correlation (r=070 p<005) was set between IL-6 production from AMs and the ratio of [CD4sup+]/[CD8sup+] in BAL fluid, although no correlation was observ between that from monocytes and [CD4sup+]/[CD8sup+] ratio in BAL fluid. Taken together, IL-6 may be involved in the initiation and maintenance of alveolitis at activating and causing the proliferation of T cells

(Chest 1994; 106:156-60)

AM=alveolar macrophage; BAL=bronchoalveolar lavage;

ELISA=enzyme-linked immunosorbent assay;

FCS=fetal calf serum;

IL-6=interleukin 6;

MoAb=monoclonal antibody;

TNF[alpha]=tumor necrosis factor [alpha]

Sarcoidosis is a disease of unknown etiology characterized on the presence of noncaseating epithelioid small room granulomas in affected organs.(1)(2)(3) However, the precise mechanism of granuloma formation is still unknown. lately involvement of certain cytokines in the progression in a continuously ascending gradation of granulomas was reported.(4)(5)(6) Among like cytokines, monokines are suggested to be important for granuloma formation. Interleukin 1[beta] (IL-1[beta]) as well as tumor necrosis factor [alpha] (TNF[alpha]) has been demonstrated to be essential for granuloma formation in in vivo and in vitro granuloma models(7)(8)(9) Another monokine, interleukin 6 (IL-6), has been shown to have various kinds of biologic activities, including activation of B and T confined apartments production of acute-phase reactants, and production of immunoglobulins.(10)(11)(12)(13) Interleukin 6 has been reported to be produc on T cells, monocytes, fibroblasts, and other cells(14)

In sarcoidosis, patients ofttimes reveal increased levels of immunoglobulins, which leads common to consider the possible part of IL-6 in its exhibition To clarify the role of IL-6 in the progressive growth of the disease, in the not away study we determined IL-6 plains in serum and bronchoalveolar fluid. We also evaluated IL-6 on a levels in the supernatants of cultur monocytes and alveolar macrophages (AMs) obtained from either patients with sarcoidosis or healthy controls

MATERIALS AND METHODS

Subjects

Thirty-eight patients with sarcoidosis consisting of 11 men and 27 women with a mean (SD) age of 489 ( [+ or -] 169) years were used in the at hand study. Sarcoidosis was diagnosed based forward the clinical picture and the neighborhood of epithelioid cell granulomas in a biopsy specimen from lung skin, or lymph node and all patients had chronic conditions. According to the classification classifications defined by Wurm and associates,(15) 9 19 5 and 5 patients were in stage 0 stage I, stage II, and stage III, respectively. From the clinical picture and the chest radiographic findings, 27 and 11 patients were classified in active and inactive stage, respectively. Active stage was defined as any deterioration in the chest radiographic finding and clinical picture during the past 6 month while inactive stage was defined as that with no deterioration. No patients were receiving corticosteroids.

Healthy make liables consisting of 15 men and 13 women with a mean age of 448 ([+ or -] 146) years, were used as manages Among those 28 subjects, 21 quick in emergenciesed with complaints of hemoptysis at our hospital with no history of pulmonary disease based forward results of physical examination, chest radiography and bronchoscopic examination. The other seven were offers and free from all diseases. None of the direct subjects was receiving medication at the time of evaluation.

Eight of 38 patients and 5 of 28 have the direction of subjects were smokers.

This inquiry was approved by the Institutional Committee forward Human Research (Nagoya City University) and informed coherence was obtained from the subjects

Preparation of Lung and life-blood Mononuclear Cells

Bronchoalveolar lavage (BAL) was performed as described previously,(16) using four aliquots (50 ml each) of sterile saline solution. Fluid was get backed by gentle aspiration and was loched The total cell count was obtained forward an aliquot of uncentrifuged fluid using a hemocytometer. Differential confined apartment counts were determined from cytocentrifuge preparations stained with May-Grunwald-Giemsa staining. The remaining fluid was centrifuged (600 g for 5 min), and the confined apartment pellet was washed sequentially in MEM solution (Nissui Seiyaku Co Ltd Tokyo) containing penicillin G (100 U/ml) and streptomycin (100 [micro]g/ml). Then, the solitary abode; squalids were resuspended in RPMI-1640 medium (Gibco Lab) containing 10 percent fetal calf serum (FC Gibco Lab) at [10sup6] lonely dwellings per milliliter. The total reviveed cells averaged 2.4 [+ or -] 03 x[10sup5] (mean [+ or -] SD) small rooms per milliliter (67 [+ or -] 15 percent AMs, 31 [+ or -] 14 percent lymphocyte [CD4sup+]/[CD8sup+] ratio=5.5 [+ or -] 31) in patients with sarcoidosis, and 07 [+ or -] 02x[10sup5] small rooms per milliliter (88 [+ or -] 7 percent AMs, 10 [+ or -] 6 percent lymphocyte [CD4sup+]/[CD8sup+] ratio=1.1 [+ or -] 09) in the commands In all cases, more than 98 percent of the win backed cells were determined to be viable according to the trypan blue dye exclusion method

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