CD14 expression upon alveolar macrophages (AM) was studied in patients with sarcoidosis using immunocytochemistry and cytometric analysis.

CD14 expression upon alveolar macrophages (AM) was studied in patients with sarcoidosis using immunocytochemistry and cytometric analysis. Compared with healthy direction donors, patients had elevated percentages of CD 14-positive AM (22 percent v 34 percent) and the antigen density was threefold higher (92 v 297 channels). Furthermore, soluble serum CD14 (ssCD14) was significantly elevated in patients with sarcoidosis with an average of 53 [+ or -] 16 mg/L v 32 [+ or -] 07 mg/L in healthy have the direction of subjects. Follow-up of undivided patient, whose lung function proof results improved during therapy with corticosteroids, revealed a concomitant decrease of CD14 staining in succession AM and of ssCD14.

Statistical analysis revealed a negative correlation between CD14 expression in succession AM and [Po.sub.2] at quiescence (p = 0.0005), and after labor (p = 002) flats of ssCD14 gave a positive correlation to reduction of Dco (p = 0006) and VC (p = 005) These data put in mind of that CD14 expression is related to severity of disease and that it may be useful for monitoring in sarcoidosis.

Sarcoidosis is a systemic inflammatory disease with a lung involvement in more than 80 percent of patients. Histologic meditation of the lung demonstrates formation of granulomas and diffuse infiltrations at mono-nuclear cells with a preponderance of CD4-positive T confined apartments In bronchoalveolar lavage (BAL), similar changes were observ in that among lymphocyte the CD4-positive confined apartments predominate.[1,2] Alveolar macrophages (AMs) are, however, also increased in number and these small rooms show signs of activation like increased expression of HLA-DR, transferrin receptor, and interleukin 2 (IL-2) receptor.[3-5]

Alveolar macrophages do expres the CD14 monad a 55-kd phosphatidyl-inositol anchored enclosed space surface molecule, which is crucially involved in activation according to lipopolysaccharide.[6] When looking at different stages of differentiation in the monocyte lineage, CD14 is absent from monoblasts in bone marrow, as evidenced by way of negativity of monoblastic cell lines like U937[7] In progeny CD14 is expressed at high evens in regular monocytes and at cheap levels in the novel subset of CD14+/CD16+ monocytes.[8] Tissue macrophages, which are derived from life-current monocytes, may express high of the same heights of CD14 as shown for peritoneal macrophages, while AMs exhibit to only a low level of CD14 expressions.[8,9] Since stimulation of monocytes may enhance CD14 expression, united might speculate that this ultimate particle is upregulated on AM in sarcoidosis. In fact, in a previous investigation in inflammatory lung disease, CD14 expression forward AM was found increased as evidenced by dint of microscopic evaluation of immunofluorescence staining.[10] Therefore, we have taken a obstruct look at CD14 expression by dint of performing a quantitative analysis of cellular CD14 forward AM and of soluble CD14 in patient serum Our data point out that the increase of CD14 correlates with the lung function impairment in the disease.

MATERIALS AND METHODS

application of mind Population

Eleven patients with sarcoidosis (8 men 3 women 9 nonsmokers, 2 smokers) age between 25 and 71 years, were investigated. The diagnosis was based onward histologic examination either of transbronchial biopsy specimens or explain lung biopsy specimens. For clinical grading, lung function trials were performed (vital capacity [VC] diffusing capacity for carbon monoxide [Dco] [Posub2] at pause and after exercise) (Table 1) All patients underwent bronchoalveolar lavage (BAL). The superintendence group consisted of 10 healthy donors (nonsmokers, 6 men 4 women) for BAL and an additional 23 healthy donors for serum samples (14 women 9 men 19 nonsmokers, 4 smokers) between 25 and 50 years of long date The study was cleared through the Ethics Committee of the Medical Faculty, University of Munich, Germany.

Bronchoalveolar Lavage

After informed harmony was obtained, BAL was performed through instilling 160 ml of 09 percent saline solution in 20-ml aliquots into the lingula or middle lobe and by dint of withdrawing the fluid immediately. Total small cavity counts were determined and cytocentrifuge smears were prepared for cytologic and immunocytochemical analysis. Differential lonely dwelling counts of 200 cells were made (Wright-Giemsa staining) (Table 2)

[TABULAR DATA OMITTED]

Immunocytochemistry

For immunocytochemical staining, monoclonal antibodies (MoAB) were used in conjunction with the alkalin phosphatase antialkaline phosphatase technique.[11] T-cell subset were identified with CD4+ and CD8+ MoABs (Dakopatts, Hamburg, Germany). For detection of CD14 we used the antibody My4 (Coulter Electronics, Krefeld Germany) at saturating concentrations along with the respective CD8 isotype control

Cytometry

Staining of AMs for CD14 comes in a broad distribution of staining intensities with the difficulty of discriminating weakly positive and negative enclosed spaces by eye. Therefore, these confined apartments were evaluated by cytometry.[12] For these analyses, 100 lonely dwellings or more per specimen were studied using a microscope (Zeiss UEM objective magnification x 25 num ap. 055 optovar 16 filter 0G 550 nm) and CCD-TV camera (Hamamatsu C 3077-01) Each small room was segmented semiautomatically or interactively and was measured with an image analysis combination of parts to form a whole (SAMBA, Dynatech Laboratories, Inc) and the MINT 5 program. This program performs a standardized measurement for optical density (OD) including shading correction. The odyle readings were corrected by subtracting the background of the respective slides. The chooseed images were digitized into 512 x 512 pixels resulting in pixel distances of 0273 [micro]m. Transmission was transformed pixelwise into extinction and digitized into 256 channels (8 bit). Mean specific staining intensity was determined at subtraction of the mean odyl for the control (CD8) staining from the mean odyllic force for the specific (CD14) staining. Percent positive enclosed spaces was determined using channel-by-channel subtraction of isotype restrain histograms from histograms for specific staining.

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