PubMed Health⌕ Search

Biomedical subjects

D Clerc

Publications and source records attributed to D Clerc.

At least 37 records · Page 2Linked to original sources
PubMed1991

Output grating couplers on planar optical waveguides as direct immunosensors.

We demonstrated the feasibility of using integrated optical output grating couplers in direct immunosensing. We monitored as functions of time, first the adsorption of an antigen (Ag) on the waveguide's surface, and subsequently, the binding of the corresponding antibody (Ab), i.e. the formation of the immuno-complex Ag-Ab. The Ag was human immunoglobulin G (h-IgG), and the Ab was rabbit anti-h-IgG. We also studied the adsorption of avidin. The refractive indices nF', thicknesses dF', and surface coverages gamma of the adsorbed adlayers and of the immuno-complex Ag-Ab, respectively, were determined.

Adsorption↗
PubMed1991

Detection of Epstein-Barr virus DNA by in situ hybridization and polymerase chain reaction in salivary gland biopsy specimens from patients with Sjögren's syndrome.

PURPOSE: To determine whether Epstein-Barr virus (EBV) could be involved in the pathogenesis of Sjögren's syndrome (SS). PATIENTS AND METHODS: In situ hybridization using the BamH1-W fragment of EBV DNA was performed using labial salivary gland biopsy specimens from 14 patients with SS (eight with primary SS and six with secondary SS) and 39 control subjects. Furthermore, labial salivary gland biopsy specimens from 12 patients with SS (seven with primary SS and five with secondary SS) and 24 control subjects were submitted to the polymerase chain reaction to detect EBV DNA. RESULTS: In situ hybridization detected EBV DNA in epithelial cells of labial salivary gland biopsy specimens from four of eight (50%) patients with primary SS, zero of six patients with secondary SS, and three of 39 (8%) control subjects. The difference between patients with primary SS and control subjects was statistically significant (p less than 0.02). The polymerase chain reaction detected EBV DNA in six of seven (86%) patients with primary SS, three of five (60%) patients with secondary SS, and seven of 24 (29%) control subjects. The difference between patients with primary SS and control subjects was statistically significant (p less than 0.01). CONCLUSION: Both newly developed techniques showed that the presence of EBV DNA was significantly increased in patients with primary SS in comparison with control subjects. In all the positive SS patients who underwent in situ hybridization, epithelial cells of the labial salivary gland were the target of EBV infection. Our results suggest that this virus may play a role in the pathogenesis of SS. We cannot yet determine whether EBV is directly responsible for the destruction of the gland, or if its presence is a secondary event following gland injury.

Adult↗
PubMed1990

[Anti-radical enzymes, oxygenated free radicals and lipoperoxydation in rheumatoid polyarthritis. Effects of treatment with D-penicillamine].

Three aspects of the action of oxygenated free radicals were studied in 10 controls and 20 patients with rheumatoid arthritis, 11 not treated and 9 treated with D-penicillamine. Free radical production was evaluated in whole blood, malondialdehyde was measured in plasma, the concentration of antiradicular enzymes (copper and manganese superoxide dismutase, catalase and glutathion peroxydase) in hemolysate, platelets and plasma and copper superoxide dismutase activity in a chloroform erythrocyte extract. Only patients treated with D-penicillamine showed a significant decrease in the concentration of platelet anti-radicular enzymes and plasma manganese superoxide dismutase. The involvement of oxygenated free radicals in the pathophysiology of rheumatoid arthritis and in the mechanism of action of D-penicillamine in this pathology is discussed.

Arthritis, Rheumatoid↗
PubMed1989

Rectus femoris sheath: a new localization of hip synovial cyst.

Iliopsoas bursitis is the classical manifestation of synovial cysts of the hip. We report the first observation of a new localization of these cysts: the sheath of rectus femoris muscle. The patient presented with a hip osteoarthritis and an important mass of the front of the thigh. Computed tomography was useful in establishing the diagnosis and hip arthrography confirmed the communication between the joint and the rectus femoris sheath.

Arthrography↗
PubMed1988

[Antibody activity of monoclonal immunoglobulins].

Monoclonal immunoglobulins present a normal structure and have an antibody activity. This activity may be directed against exo-antigens especially bacterial, but more frequently against auto-antigens. It may then be symptomatic and therefore explain unusual clinical or biological manifestations in the course of monoclonal dysglobulinemias; but, most of the time, the monoclonal auto-antibody activity is asymptomatic and polyspecific, as it is only the monoclonal expression of polyclonal natural auto-antibodies. A comprehensive review of the various antibody activities of monoclonal immunoglobulins is presented. With the presence, in large quantities, of monoclonal immunoglobulins and their antibody activity, the links between dysglobulinemia and autoimmune disease are discussed as well as the pathogenic role of auto-antibodies.

Agglutinins↗