No abstract available.
Animals ; Germinal Center* ; Lymph Nodes* ; Mice*

No abstract available.
Animals ; Erythrocytes* ; Germinal Center* ; Mice* ; Sheep* ; Spleen*

OBJECTIVETo improve the understanding of progressive transformation of lymph node germinal centers (PTGC) and to explore its clinical, histopathologic and immunohistochemical features and the differential diagnosis between the related disease of germinal center hyperplasia.

METHODSThe clinical manifestation, laboratory bindings, treatment and outcome of a patient with PTGC were presented.

RESULTSThe main manifestation of the patient was painless peripheral lymphadenopathy. Histopathologic examination of an axillary lymph node showed reactive follicular hyperplasia and the progressive transformation changes germinal centers. The borderline between the germinal center and the mantle layer was obscured. The cells in the progressive transforming germinal centers were positive for CD20(+), CD5(+), CDw75(+).

CONCLUSIONPTGC is a rare lymphoid disorder. Histopathology and immunohistochemistry are important basis of the diagnosis.

The lymphoepithelial cyst (LEC) rarely occurs in the thyroid gland. The LEC has been thought to be related to developmental rest, namely solid cell nest, which is derived from ultimobranchial body. We report a case of lymphoepithial cyst in a 34- year-old woman clinically diagnosed with Hashimoto's thyroiditis. The cyst was located in mid to lower portion of the left lobe. It was a single unilocular cyst, which for the most part was lined with squamous epithelium, and at certain foci with ciliated columnar epithelium. The cyst wall showed a dense lymphocytic infiltration, numerous lymphoid follicles with germinal centers and admixed thyroid follicles. This morphology is similar to the branchial cleft cyst, with the exception of the thyroid follicles in the cyst wall. Near the cyst were several solid epidermoid cell nests. Immunohistochemical stain of this cyst-lining epithelium and solid cell nests showed CEA positivity. In view of the similarity in histomorphology and CEA positivity to branchial cleft cyst of the lateral neck, the LEC of the thyroid could also have been of branchial origin. However, the admixed thyroid follicles in the cyst wall suggests that the LEC of the thyroid gland might have derived from another branchial cleft as a ultimobranchial body, because it has the potential for thyroid follicular differentiation.
Branchial Region* ; Branchioma ; Epithelium ; Female ; Germinal Center ; Humans ; Neck ; Thyroid Gland* ; Thyroiditis ; Ultimobranchial Body

Congenital branchial anomalies are developmental defects resulting from incomplete obliteration of branchial clefts, arches and pouches, and usually found as cysts, fistulas and sinuses. The sinus or fistula is usually noted during infancy and young childhood due to recurrent infection. We have experienced a case of branchial cleft fistula in a 12-year-old male. It was a skin colored, nontender nodule which had mucus secreting from a small opening pore. We performed complete surgical removal and histopathologically the lumen was lined by pseudostratified columnar cells and the stroma was composed of aggregates of lymphocytes with many germinal centers. So we finally diagnosed it as branchial cleft fistula of second type branchial anomaly.
Branchial Region* ; Child ; Fistula* ; Germinal Center ; Humans ; Lymphocytes ; Male ; Mucus ; Skin

Kimura's disease is a rare chronic inflammatory disorder with slowly enlarging subcutaneous masses. We report a case of Kimura's disease in a 33-year-old man who had such disease since childhood. He had asymptomatic variable sized, skin colored subcutaneous masses on the left cheek, both mastoid area, right epicanthus, and right parotid area. A biopsy specimen showed many lymphoid follicles with germinal center in dermis and a dense infiltration composed of small lymphocytes, plasma cells, histiocytes, and eosinophils. He was treated with triamcinolone intra-lesional injections(10 mg/ml).
Adult ; Biopsy ; Cheek ; Dermis ; Eosinophils ; Germinal Center ; Histiocytes ; Humans ; Lymphocytes ; Mastoid ; Plasma Cells ; Skin ; Triamcinolone

Recent advances in the understanding of the biology of Hodgkin lymphoma have led to a new classification. Hodgkin lymphoma is now recognized as a B-cell disorder of germinal center or post-germinal center origin. In the WHO classification, Hodgkin lymphoma consists of two categories, namely, nodular lymphocyte predominant Hodgkin lymphoma and classical Hodgkin lymphoma. Classical Hodgkin lymphoma encompasses not only nodular sclerosis, mixed cellularity, and lymphocyte depletion subtypes, but also lymphocyte-rich subtype, among which, nodular sclerosis stands out as a distinct entity. A borderline neoplasm with features intermediate between Hodgkin lymphoma and diffuse large B-cell lymphoma has also been recognized.
B-Lymphocytes ; Biology ; Diagnosis, Differential ; Germinal Center ; Hodgkin Disease ; Lymphocyte Depletion ; Lymphocytes ; Lymphoma, B-Cell ; Sclerosis

Understanding germinal center reactions is crucial not only for the design of effective vaccines against infectious agents and malignant cells but also for the development of therapeutic intervention for the treatment of antibody-mediated immune disorders. Recent advances in this field have revealed specialized subsets of T cells necessary for the control of B cell responses in the follicle. These cells include follicular regulatory T cells and Qa-1-restricted cluster of differentiation (CD)8+ regulatory T cells. In this review, we discuss the current knowledge related to the role of regulatory T cells in the B cell follicle.
Germinal Center ; Immune System Diseases ; T-Lymphocytes ; T-Lymphocytes, Helper-Inducer ; T-Lymphocytes, Regulatory* ; Vaccines

Production of high affinity antibodies for antigens is a critical component for the immune system to fight off infectious pathogens. However, it could be detrimental to our body when the antigens that B cells recognize are of self-origin. Follicular helper T, or Tfh, cells are required for the generation of germinal center reactions, where high affinity antibody-producing B cells and memory B cells predominantly develop. As such, Tfh cells are considered as targets to prevent B cells from producing high affinity antibodies against self-antigens, when high affinity autoantibodies are responsible for immunopathologies in autoimmune disorders. This review article provides an overview of current understanding of Tfh cells and discusses it in the context of animal models of autoimmune diseases and allograft rejections for generation of novel therapeutic interventions.
Allografts* ; Antibodies ; Autoantibodies ; Autoantigens ; Autoimmune Diseases* ; Autoimmunity ; B-Lymphocytes ; Germinal Center ; Immune System ; Memory ; Models, Animal

We studied retrospectively on clinical assessment of treatment in myasthenic patients who visited on our department regularly since 1985. They were divided as a group based on therapeutic modalities such as a thymectomy, steroid therapy. Combined therapy(steroid and thymectomy), plasma exchange. And whole body irradiation. We evluated clinical effectiveness of these therapeutic modalities and come up with following conclusions. Alltherapeutic modalities showed effectiveness. In steroid therapy, thymectomy and the combined therapy. W needed at least 6-24 months for clinical improvement. In thymectomy, rognosis was depend on the number of germinal centers. In whole body irradiation. Effectiveness was shown at 5h week and continued to 6th to 12th months. We also noted that symptomatic improvement was correlated with decreased lymphocyte counts. The effect of plasma exchange was rapid but only short duration.
Germinal Center ; Humans ; Lymphocyte Count ; Myasthenia Gravis* ; Plasma Exchange ; Retrospective Studies ; Thymectomy ; Whole-Body Irradiation