Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UNIPROT:P06126 (CD1a)
 2,221 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Linear IgA bullous dermatosis (LAD) is an acquired, heterogeneous, subepidermal blistering disease characterized by linear IgA deposits at the dermoepidermal basement membrane zone (BMZ), often with circulating IgA antibodies to the BMZ. The pathogenetic mechanism, possibly related to the immunophenotype of infiltrating cells, as well as the potential role of cytokines in determining bullous lesions, have not yet been elucidated. An immunohistochemical study was performed with a large panel of monoclonal antibodies [to CD3, CD4, CD8, CD25, CD1a, CD30, CD54, CD50, endothelial leucocyte adhesion molecule-1, vascular cell adhesion molecule-1, myeloperoxidase (MPO), eosinophil cationic protein EG1 and EG2, tryptase, HLA-DR, human interleukin (IL)-3, human IL-5, human IL-8, human IL-4, tumour necrosis factor (TNF)-alpha, interferon (IFN)-gamma and granulocyte/macrophage colony-stimulating factor] using the alkaline phosphatase-antialkaline phosphatase procedure on lesional and perilesional skin of nine patients (one male, eight female; age range 8 months-80 years) with clinical, histological and immunofluorescent proven LAD. The predominant infiltrating cells, distributed mostly inside and below the bullae, were neutrophils and eosinophils which showed intense activation (MPO +, EG1 +, EG2 +). The lymphocytic infiltrate, consisting principally of CD4 +, HLA-DR + and CD30 + T cells, had a predominantly perivascular distribution. Proinflammatory cytokines, such as TNF-alpha and IFN-gamma, showed a moderate focal expression on the dermal perivascular sites; IL-8 was found to have a particularly intense staining on all the epidermal cell layers and at perivascular and vascular sites. Other cytokines, such as IL-4 and IL-5, showed a prevalent intracytoplasmic staining on some cells of the dermal infiltrate (probably mastocytes and lymphocytes), and at the dermal-epidermal separation sites there was also an intense scattered distribution of IL-5. The specific tissue lesions of LAD may be the consequence of the IgA deposits at the BMZ and also of the release of these cytokines together with tissue damage enzymes derived from neutrophils or eosinophils.
 ...
PMID:The role of lymphocytes, granulocytes, mast cells and their related cytokines in lesional skin of linear IgA bullous dermatosis. 1035 73

Establishment of an assay capable of generating all classes of human lymphocytes from hematopoietic stem cells (HSCs) will provide new insight into the mechanism of human lymphopoiesis. We report ontogenic, functional, and histologic examination results of reconstituted human lymphocytes in NOD/SCID/ gammacnull mice after the transplantation of human cord blood (CB) CD34+ cells. After transplantation, human B, natural killer (NK), and T cells were invariably identified in these mice, even though no human tissues were cotransplanted. Immature B cells resided mainly in bone marrow (BM), whereas mature B cells with surface immunoglobulins were preferentially found in spleen. NK cells were identified in BM and spleen. T cells were observed in various lymphoid organs, but serial examinations after transplantation confirmed human T lymphopoiesis occurring in the thymus. These human lymphocytes were also functionally competent. Human immunoglobulin M (IgM), IgA, and IgG were detected in the sera of these mice. T cells showed a diverse repertoire of T-cell-receptor Vbeta (TCR Vbeta) chains, proliferated in response to phytohemagglutinin, and were cytotoxic against cell lines. NK activity was demonstrated using the K562 cell line. Immunohistochemical analysis revealed that human lymphocytes formed organized structures in spleen and thymus that were analogous to those seen in humans. In the thymus, CD4 and CD8 double-positive T cells were predominant and coexpressed CD1a and Ki-67, thereby supporting the notion that T lymphopoiesis was taking place. NOD/SCID/ gammacnull mice provide a unique model to investigate human lymphopoiesis without the cotransplantation of human tissues.
 ...
PMID:Complete reconstitution of human lymphocytes from cord blood CD34+ cells using the NOD/SCID/gammacnull mice model. 1268 24

Conjunctival lymphoid follicles (CLFs), present in normal individuals, undergo hyperplasia upon conjunctival infection by a specific array of pathogens; infection-associated enlargement of draining preauricular lymph nodes suggests that conjunctival follicles participate in the afferent limb of acquired immune responses for the ocular surface. The present study was performed to delineate the structural and lymphoid anatomy of CLFs in the baboon (Papio anubis), a non-human primate conjunctival model with close similarity to the human. Conjunctiva from both eyes, along with mesenteric lymph node, spleen, tonsil, and ileum controls were harvested from ten baboons at necropsy, and studied by histochemical and immunohistochemical methods. Baboon conjunctival follicles were identified as dense oval collections of leukocytes in the substantia propria with infiltration into a thinned overlying conjunctival epithelium. Goblet cells were universally absent, the overlying mucin layer was attenuated, and the follicle-associated epithelium (FAE) demonstrated comparatively diminished alkaline phosphatase expression. The basement membrane overlying each follicle appeared discontinuous. CD4-positive T lymphocytes were distributed in parafollicular areas and to a lesser degree in follicle germinal centers. B lymphocytes formed the predominant cell in follicles, and also heavily infiltrated the FAE. B cell IgM expression was prominent in germinal centers, while IgD staining occurred in a horseshoe-shaped distribution in the follicle mantle zone. Although B cell IgA expression was noted in the non-follicular conjunctiva, IgA expression was inconspicuous within conjunctival follicles. S-100- and CD1a-positive dendritic cells were found in FAE, while fascin-positive mature dendritic cells appeared in the deeper areas of each follicle. CD68-positive macrophages were dispersed throughout the follicles. CD35-positive follicular dendritic cells were observed only in germinal centers. CLFs appear highly organized consistent with a role in the adaptive immune response to conjunctival pathogens.
 ...
PMID:Structural and cellular architecture of conjunctival lymphoid follicles in the baboon (Papio anubis). 1274 51

We describe the clinical, histopathologic, and immunohistochemical characteristics of episcleral/conjunctival pseudorheumatoid nodulosis, a new granulomatous entity that belongs among a group of related lesions. Specifically, pseudorheumatoid nodulosis should be differentiated from solitary rheumatoid nodules, rheumatoid nodulosis, accelerated rheumatoid nodules and nodulosis, and solitary pseudorheumatoid nodules. A 53-year-old man presented with bilateral painless, large, faintly yellow-gray, partially immobile, solid, circumscribed, and occasionally confluent episcleral nodules of several months' duration. He had never had clinical rheumatoid arthritis and was rheumatoid factor negative. Biopsy revealed multiple, merging episcleral/conjunctival, nonulcerated, palisading granulomas with variably sized central zones of necrobiosis of collagen. Abundant palisading CD68/163 + histiocytes admixed with fibroblasts surrounded the necrobiotic foci, which failed to stain with Alcian blue for mucopolysaccharides. No fibrinoid deposits were detected. Numerous CD3+ T lymphocytes, fewer CD 20 + B lymphocytes, and a smaller subpopulation of CD138 + plasma cells were present. Numerous CD1a + Langerhans cells were scattered among the palisading histiocytes and overlying epithelium. Immunohistochemical stains for immunoglobulins revealed concentrations of IgG, IgM, and IgA, but not IgE, in the necrobiotic zones. Special stains did not reveal evidence of infection nor did polarization microscopy display any foreign material. An extensive systemic and serologic workup was negative. We review simulating palisading or other nonrheumatic granulomas that should be distinguished from pseudorheumatoid nodules or nodulosis and explore therapeutic options.
 ...
PMID:Bilateral epibulbar pseudorheumatoid nodulosis with a review of ocular adnexal palisading granulomas. 3077 65