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Y Merot

Publications and source records attributed to Y Merot.

26 records · Page 2Linked to original sources
PubMed1985

Depletion and repopulation of epidermal dendritic cells after allogeneic bone marrow transplantation in humans.

We have observed marked depletion of epidermal dendritic cells, defined by monoclonal antibodies directed against HLA-DR (Ia-like) and T6 antigens, after allogeneic bone marrow transplantation. To more precisely characterize this observation, we examined a total of 39 sequential biopsies from 15 patients both before and after allogeneic bone marrow transplantation. Profound depletion of HLA-DR and T6-positive epidermal dendritic cells was observed early after transplantation (1-4 weeks), followed by gradual and variable repopulation. Transmission electron microscopy confirmed absence of dendritic cells in selected biopsies. Depletion of dendritic cells did not appear to be related to development of clinical or histologic evidence of graft-versus-host disease, suggesting that depletion may relate to pretransplant conditioning regimens. The rate of return of these cells, however, may be influenced by the presence or persistence of clinical disease. Repopulation of epidermal dendritic cells after initial depletion in bone marrow transplantation represents a human model relevant to studies concerned with the origin and kinetics of Langerhans cells.

Adolescent↗
PubMed1985

Extramammary Paget's disease of the perianal and perineal regions. Evidence of apocrine derivation.

A case of perianal and perineal extramammary Paget's disease in a male is reported. The presence of gross cystic disease fluid protein--a new marker of apocrine epithelia--in Paget's cells provides additional insight into the histopathogenesis of this condition. This marker may be a valuable diagnostic adjunct in evaluating intra-epithelial malignancies at a variety of anatomic sites.

Aged↗
PubMed1984

Normal rabbit Merkel cells do not express neurofilament proteins.

Three hundred and five normal Merkel cells (MC) were studied in rabbit lip specimens by a double indirect immunofluorescence technique using both neurofilament (NF) antiserum and a monoclonal antibody to rabbit MC. NF proteins were not found to be expressed in MC. This suggests that MC are not neural cells and that NF-positive neuroendocrine carcinomas of the skin do not derive from MC.

Animals↗
PubMed1983

Skin calcium-binding protein immunoreactivity in basal cell carcinoma.

Skin calcium-binding protein (SCaBP) is a low molecular weight protein of unknown function which is localized in the cytoplasm of epidermal basal cells. We have examined SCaBP immunoreactivity in basal cell carcinoma (BCC) since BCC cells retain some of the characteristics of basal cells, including the capacity for proliferation and migration from the dermo-epidermal junction. We also examined immunoreactivity to basement membrane zone (BMZ) antigens (type IV collagen, laminin and bullous pemphigoid antigen) in BCC. We found that all BCC cells showed SCaBP immunoreactivity regardless of the histological type or position of the cells. BMZ antigens were expressed around tumourous buds, although bullous pemphigoid antigen may also present a cytoplasmic immunoreactivity. Our results suggest that SCaBP immunoreactivity is independent of the basal position of the cell, but may be related to the proliferative capacity and the undifferentiated state of the cell.

Animals↗
PubMed1983

[Photosensitivity associated with carprofen (Imadyl), a new non-steroidal anti-inflammatory drug].

Carprofen is a new non-steroidal anti-inflammatory drug and a phenylpropionic acid derivative. It seldom causes pruritus, erythema or urticaria. Since 1 year, we have observed 8 photosensitive eruptions associated with Carprofen, a surprising side effect for this group of derivatives. The skin eruption started from 4 days to 3 weeks after the initiation of the treatment and was always limited to the exposed areas of the skin. The eruption was erythematopapular, but also vesioular or bullous. 2 cases required systemic corticosteroids. Photo patch tests were positive, suggesting a photoallergic process. Phototherapy should be avoided in patients treated with carprofen.

Adult↗
PubMedDate not supplied

The substitution of glucose-antiglucose oxidase complex (GAG) for peroxidase-antiperoxidase (PAP) in immunohistochemical studies of skin.

The substitution of glucose-antiglucose oxidase complex (GAG) for peroxidase antiperoxidase (PAP) in the Sternberger three-layer unlabeled antibody method avoids the problems associated with the use of the chromogen 3,3,diaminobenzidine (DAB). The blue final reaction product obtained using the GAG complex is not obscured by melanin granules, which is often the case when using the PAP-DAB combination. The replacement of PAP with GAG complexes facilitates the detection of melanocytes in melanoma and blue nevi. The absence of endogenous glucose oxidase in mammals provides for greater image contrast, which is not possible using alternative chromogens and immunoperoxidase.

Glucose Oxidase↗