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B-cell activation in patients with irritable bowel syndrome (IBS).

Artikel i vetenskaplig tidskrift
Författare Lena Öhman
Ann-Charlotte Lindmark
Stefan Isaksson
Iris Posserud
Hans Strid
Henrik Sjövall
Magnus Simrén
Publicerad i Neurogastroenterology and motility : the official journal of the European Gastrointestinal Motility Society
Volym 21
Nummer/häfte 6
Sidor 644-50, e27
ISSN 1365-2982
Publiceringsår 2009
Publicerad vid Institutionen för biomedicin, avdelningen för mikrobiologi och immunologi
Institutionen för medicin, avdelningen för invärtesmedicin
Sidor 644-50, e27
Språk en
Länkar dx.doi.org/10.1111/j.1365-2982.2009...
Ämnesord Adult, Antigen-Presenting Cells, physiology, Antigens, CD40, biosynthesis, Antigens, CD80, biosynthesis, Antigens, CD86, biosynthesis, B-Lymphocytes, immunology, metabolism, physiology, Cells, Cultured, Female, Flow Cytometry, Gram-Positive Bacteria, immunology, HLA-DR Antigens, biosynthesis, Humans, Immunoglobulin G, biosynthesis, genetics, Integrin beta Chains, biosynthesis, Irritable Bowel Syndrome, immunology, physiopathology, Leukocyte Count, Lymphocyte Activation, immunology, physiology, Male, Middle Aged, Phenotype, Probiotics, Stimulation, Chemical, Young Adult
Ämneskategorier Immunologi inom det medicinska området, Gastroenterologi

Sammanfattning

Patients with irritable bowel syndrome (IBS) may have a low grade immune activation. However, little is known about the properties of B cells of IBS patients. We therefore investigated activation level and antigen presenting phenotype of blood B cells of IBS patients. We also examined B-cell responses to lipopolysaccharide (LPS) and probiotic bacteria. Blood samples were obtained from 74 IBS patients and 30 healthy subjects. Peripheral blood mononuclear cells were isolated and stimulated with LPS or an UV-light inactivated bacterial cocktail consisting of the probiotic Gram-positive strains; Lactobacillus paracasei ssp. paracasei 19, Lactobacillus acidophilus La5, Bifidobacterium lactis B612. The phenotype of CD19(+) B cells was investigated by flow cytometry before and after 72 h cell culture. Furthermore, IBS symptom severity was assessed. B cells isolated from blood of IBS patients displayed an amplified activation level as demonstrated by increased cell surface expression of IgG, and also the costimulatory molecules CD80 and CD86. Expression of antigen presenting HLA-DR and costimulatory molecule CD40 on B cells was, however comparable in IBS patients and controls. B cells of IBS patients displayed an impaired ability to increase expression of CD80, but not CD86, in response to both LPS as well as probiotic bacteria stimulations. To conclude, blood B cells of IBS patients have an increased activation level. Bacterial component induced expression of the costimulatory molecule CD80, regarded as important for tolerance induction, is impaired. These data suggest that B-cell antigen presentation in IBS patients is associated with altered capacity of providing costimulation to T cells.

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