Dynamics of murine B lymphocytes is modulated by in vivo treatment with steroid ouabain
| Autor: | Joyle Moreira Carvalho da Silva, Mariana Pires Teixeira, Vivian M. Rumjanek, Kelli Monteiro da Costa, Rodrigo Roitman Pozzatti, Luciana Souza de Paiva, Fábio B. Canto, Thais Andressa Gonçalves Vianna, Augusto das Neves Azevedo, Vinicius Ribeiro Cabral, Rebeca Pinheiro dos Santos Barbosa, Juliana Fittipaldi |
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| Rok vydání: | 2016 |
| Předmět: |
Male
Receptors CXCR5 0301 basic medicine medicine.medical_specialty Cardiotonic Agents Lymphocyte medicine.medical_treatment Immunology B-Lymphocyte Subsets Spleen Ouabain Immunophenotyping Mice 03 medical and health sciences 0302 clinical medicine In vivo Internal medicine Animals Immunology and Allergy Medicine Mesenteric lymph nodes L-Selectin Mice Inbred BALB C business.industry Hematology Marginal zone Mice Inbred C57BL Steroid hormone 030104 developmental biology medicine.anatomical_structure Endocrinology Lymphatic system Gene Expression Regulation Immunoglobulin M Immunoglobulin G Female Lymph Nodes Sodium-Potassium-Exchanging ATPase business Injections Intraperitoneal 030215 immunology medicine.drug |
| Zdroj: | Immunobiology. 221:368-376 |
| ISSN: | 0171-2985 |
| DOI: | 10.1016/j.imbio.2015.09.020 |
| Popis: | Ouabain (OUA) is a steroid hormone capable of inhibiting the protein Na+K+ATPase present in the plasma membrane of cells. Ouabain was initially extracted from the roots of African trees such as Acocanthera ouabaio and Strophantus gratus seeds and later described as an endogenous component found in higher mammals. The adrenal gland is the main site of synthesis of ouabain and it is released in stressful situations, conditions similar to those where there is secretion of corticosteroids. Immunological functions have been shown to be regulated by ouabain. In order to understand the effects of ouabain on B lymphocyte populations in different lymphoid organs, mice received intraperitoneal injections of ouabain for 3 consecutive days. Twenty-four hours after the last injection, cells were analyzed by flow cytometry. In the spleen, ouabain modulated especially follicular B cells, inducing a significant decrease in the percentage and absolute numbers of those cells. Ouabain also reduced the absolute number of marginal zone B lymphocytes. No difference in the percentage or absolute number of B lymphocytes in the spleen forty-eight hours after the last injection was observed. An increase in the number of B cells was seen in mesenteric lymph nodes and this retention appears to be directly related to increased expression of CXCR5 chemokine receptor and reduction of CD62L, which also explains the observed reduction of B cells in the spleen. Our results indicate that ouabain regulates the dynamics of B lymphocytes in peripheral organs but production of total IgM and IgG in the serum of animals treated in vivo with ouabain was not affected. |
| Databáze: | OpenAIRE |
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