No abstract available.
Animals ; Lipid A* ; Macrophages* ; Mice* ; Phagocytosis* ; Tumor Necrosis Factor-alpha*

No abstract available.
B-Lymphocytes*

No abstract available.
Animals ; Interferons* ; Macrophages* ; Mice*

No abstract available.
B-Lymphocytes* ; Lymph Nodes* ; Pertussis Toxin* ; Whooping Cough*

There are strong evidences suggesting that Thl and Th2 lymphocytes develop from the same Thlymphocyte precursor under the influence of environmental or genetic factors acting at the level of antigen presentation, but it remains to be answered whether it is possible to change the cytokine profile of established or ongoing Th1 and Th2 response. The purpose of this study is to reveal whether it is possible to reverse the cytokine profile of human Th lymphocytes by the modulation of antigen presentation. Using a multiparameter flow cytometric assay that allows simultaneous determination of surface CD4 and intracellular IFN-r or IL-4, we have studied the emergence of Th1 or Th2 lymphocytes in response to tetanus toxoid exposure and the patterns of cytokine synthesis in established T lymphocyte clones. Th2 populations arising after 4 wk of stimulation in IL-2, PHA, tetanus toxoid and irradiated autogeneic peripheral blood mononuclear cells as antigen presenting cells (APC) could give rise to IFN-r-producing Th1 lymphocytes when stimulated in IL-2 plus PHA in the absence of antigen and APC. These IFN-r-producing Th1 lymphocytes nearly disappeared and IL-4-producing Th2 lymphocytes predominated again when cultured again in the presence of antigen and APC. In contrast, prolonged culture in the absence of antigen and APC induced relative predominance of IFN-r-producing The lymphocytes. The cytokine profile of long-term Th2 population arising originally from the repeated stimulation in the presence of antigen and APC appeared more homogeneous and less reversible, although they could convert to Th1 lymphocytes when cultured without antigen and APC. These findings may explain that the polarized Th response is reversible depending on the presence of antigen presentation.
Antigen Presentation* ; Antigen-Presenting Cells ; Clone Cells ; Humans ; Interleukin-2 ; Interleukin-4 ; Lymphocytes ; T-Lymphocytes, Helper-Inducer* ; Tetanus Toxoid

Lymph nodes, one of peripheral lymphoid organs, are the sites, where the lymphocytes receive their initial instructions for producing effector functioning resulting in humoral or cell-mediated immunity. Each lymph node consists of an outer cortex in which there are aggregates of cells constituting the follicles, B-cell areas. Some follicles have central areas called germinal centers, which stain lightly. Germinal centers are B lymphoblast cell areas arising eccentrically in primary lymphoid follicles in response to T-cell dependent antigenic stimulation and are the generally accepted sites of generation of memory B cells and undergoing isotype switching and somatic mutation. We observed the morphologic, cellular, protein and molecular events arising in mouse popliteal lymph nodes in response to T-cell dependent antigenic stimulation. In this study mice were immunized into footpads with TNP-chicken ovalbumin. The germinal center formation in primary follicles of popliteal lymph nodes was first observed 6 days after immunization and germinal centers persisted until 24 days of immunization. Lymph node cells were stained with PE-labeled anti-B220 antibody and/or FITC labeled PNA and analyzed by using FACScan. B cells (B220(+) cell) in lymph node increased after 3 days and peaked between 6 and 18 days after immunization. The proportion of germinal center B cells (B220, PNA(high) cells) among lymph node B cells was low (2%) before immunization but increased at day 6 (9%) and reached the peak (30%) at day 18. The expression of IgG1 productive mRNAs and germline transcripts were observed by using RT-PCR. The expression of IgG1 productive mRNA was detected at day 10 and continued until 24 days after immunization. The expression of IgG1 germline transcripts was observed 10 days after immunization and rapidly declined over the next one week. IgG1 anti-TNP antibody, main isotype of anti-TNP antibodies, was first detected at day 14 and reached the peak level 24 days after immunization. Taken these data together, we can conclude that the first immunological event observed from mouse popliteal lymph node in response to T-cell dependent antigenic stimulation is the increase in the number of B cells, and this event is followed by appearance of germinal center B cells and at the same time by the formation of germinal center in primary lymphoid follicles. Once the germinal center is formed, the process of isotype switching to IgG1 occurs in lymph node and antigen-specific IgG1 antibody is produced.
Animals ; Antibodies ; B-Lymphocytes ; Fluorescein-5-isothiocyanate ; Germinal Center ; Immunity, Cellular ; Immunization ; Immunoglobulin Class Switching ; Immunoglobulin G ; Immunoglobulins* ; Lymph Nodes* ; Lymphocytes ; Memory ; Mice ; Ovalbumin ; RNA, Messenger ; T-Lymphocytes

No abstract available.
Chickenpox* ; Child* ; Humans ; Immunization ; Precursor Cell Lymphoblastic Leukemia-Lymphoma*

No abstract available.
Arthritis, Juvenile* ; Rheumatoid Factor*

OBJECTIVE: The purpose of this study was to analyse clinical manifestations and laboratory findings in childhood patients with polyarticularonset juvenile rheumatoid arthritis (JRA). METHODS: Eleven cases of polyarticular JRA who were diagnosed and treated in the Department of Pediatrics, Seoul National University Children's Hospital from June 1988 to May 1995 were investigated for clinical manifestations and laboratory findings. RESULTS: 1) There were 6 males and 5 females and their ages of onset were 4 years to 15.1 years(mean 10.9 years). 2) Systemic manifestations were not observed, but low-grade fever was noted in 5 patients. 3) The involvement of joints was symmetric in 9 patients and asymmetric in 2 patients. 4) The most commonly affected joints were knees and ankles, followed by proximal interphalangeal joints of hand, shoulder, elbow, temporomandibular joint, and other joints. 5) Roentgenographic changes of joints were detected in 6 patients and bone scan in 7 patients showed increased uptake in the involved joints. 6) The main laboratory findings observed were microcytic and hypochromic anemia (64%), thrombocytosis (82%), elevated eryhtrocyte sedimentation rate (100%), positive or increased C-reactive protein(100%), positive rheumatoid factor(RF) (18%), positive antinuclear antibody(ANA) (27%). RF was positive in 2 girls with later age of onset and the pattern of immunofluorescent ANA were all homogeneous. 7) Nonsteroid antiinflammatory drugs (NSAIDs) were used most frequently and steroid with or without sulfasalazine was tried in 4 patients unresponsive to NSAIDs. 8) At last follow-up, 6 cases(55%) were classified as functional class I, 4 cases(36%) as class II, and 1 case(9%) as class III. CONCLUSION: These data showed the clinical manifestations and laboratory findings of polyarticularonset juvenile rheumatoid arthritis in Korean children.
Age of Onset ; Anemia, Hypochromic ; Ankle ; Anti-Inflammatory Agents, Non-Steroidal ; Arthritis, Juvenile* ; Child ; Elbow ; Female ; Fever ; Follow-Up Studies ; Hand ; Humans ; Joints ; Knee ; Male ; Pediatrics ; Seoul ; Shoulder ; Sulfasalazine ; Temporomandibular Joint ; Thrombocytosis

No abstract available.
Hydralazine*