10 research outputs found
Behavioral Fever Drives Epigenetic Modulation of the Immune Response in Fish
Ectotherms choose the best thermal conditions to mount a successful immune response, a phenomenon known as behavioral fever. The cumulative evidence suggests that behavioral fever impacts positively upon lymphocyte proliferation, inflammatory cytokine expression, and other immune functions. In this study, we have explored how thermal choice during infection impacts upon underpinning molecular processes and how temperature increase is coupled to the immune response. Our results show that behavioral fever results in a widespread, plastic imprint on gene regulation, and lymphocyte proliferation. We further explored the possible contribution of histone modification and identified global associations between temperature and histone changes that suggest epigenetic remodeling as a result of behavioral fever. Together, these results highlight the critical importance of thermal choice in mobile ectotherms, particularly in response to an infection, and demonstrate the key role of epigenetic modification to orchestrate the thermocoupling of the immune response during behavioral fever
Un Nuevo Desafío para Acuicultura
Chile aspira a incrementar los niveles de producción de salmonicultura en los próximos años, en parte en basa a la disminución de las importantes pérdidas producidas por las enfermedades infecciosas. En este artículo se presentan antecedentes que muestran que, aunque el sistema inmune de los salmones puede parecerse al de los mamíferos, en los salmones no se conoce cuales son las características de una respuesta protectora especialmente frente a microorganismos de infección intracelular. Abordar el problema sanitario en la producción de los salmones necesariamente requiere de investigación de nivel básico en este campo.
Expression of proinflammatory cytokines and receptors by human fallopian tubes in organ culture following challenge with Neisseria gonorrhoeae
Infection of the Fallopian tubes (FT) by Neisseria gonorrhoeae can lead to acute salpingitis, an inflammatory condition, which is a major cause of infertility. Challenge of explants of human FT with gonococci induced mRNA expression and protein secretion for the proinflammatory cytokines interleukin (IL)-1alpha, IL-1beta, and tumor necrosis factor alpha (TNF-alpha) but not for granulocyte-macrophage colony-stimulating factor. In contrast, FT expression of IL-6 and of the cytokine receptors IL-6R, TNF receptor I (TNF-RI), and TNF-RII was constitutive and was not increased by gonococcal challenge. These studies suggest that several proinflammatory cytokines are likely to contribute to the cell and tissue damage observed in gonococcal salpingitis
Fas ligand+ fallopian tube epithelium induces apoptosis in both Fas receptor+ T lymphocytes and endometrial cells
Objective: To establish whether human fallopian tube (FT) epithelium can induce apoptosis in T lymphocytes and endometrial cells. Design: Laboratory-based study. Setting: Hospital. Patient(s): Women undergoing abdominal hysterectomy for FT samples, and women volunteers with and without endometriosis for endometrial biopsies. Intervention(s): FT samples obtained at time of surgery performed in reproductive-aged women with normal menstrual cycles. Main Outcome Measure(s): T lymphocytes or endometrial cells coincubated with FT epithelial cells and assayed for apoptosis by DNA nick-end labeling and caspase-3 activity, with the presence of Fas ligand (FasL) and Fas receptor (FasR) assessed by indirect immunostaining. Result(s): The epithelium of the FT-induced apoptosis in T cells as well as in human endometrial cells. The mechanism probably involves the FasL/FasR system; accordingly, we observed FasL at the apical surface of the epithelium and in the stroma of the FT at all phases of the menstrual cycle except during the early proliferative phase. The endometrial samples from patients with endometriosis did not express FasR and were resistant to apoptosis. Conclusion(s): In both FasR+ T lymphocytes and endometrial cells, FasL+ FT cells induce apoptosis. Data suggest that the FT epithelium acts as a barrier to limit the influx of lymphocytes as well as endometrial cells ascending the tube. Failure of these regulatory mechanisms may be related to the development of endometriosis. Copyrigh
table_1_Behavioral Fever Drives Epigenetic Modulation of the Immune Response in Fish.docx
<p>Ectotherms choose the best thermal conditions to mount a successful immune response, a phenomenon known as behavioral fever. The cumulative evidence suggests that behavioral fever impacts positively upon lymphocyte proliferation, inflammatory cytokine expression, and other immune functions. In this study, we have explored how thermal choice during infection impacts upon underpinning molecular processes and how temperature increase is coupled to the immune response. Our results show that behavioral fever results in a widespread, plastic imprint on gene regulation, and lymphocyte proliferation. We further explored the possible contribution of histone modification and identified global associations between temperature and histone changes that suggest epigenetic remodeling as a result of behavioral fever. Together, these results highlight the critical importance of thermal choice in mobile ectotherms, particularly in response to an infection, and demonstrate the key role of epigenetic modification to orchestrate the thermocoupling of the immune response during behavioral fever.</p
table_2_Behavioral Fever Drives Epigenetic Modulation of the Immune Response in Fish.xlsx
<p>Ectotherms choose the best thermal conditions to mount a successful immune response, a phenomenon known as behavioral fever. The cumulative evidence suggests that behavioral fever impacts positively upon lymphocyte proliferation, inflammatory cytokine expression, and other immune functions. In this study, we have explored how thermal choice during infection impacts upon underpinning molecular processes and how temperature increase is coupled to the immune response. Our results show that behavioral fever results in a widespread, plastic imprint on gene regulation, and lymphocyte proliferation. We further explored the possible contribution of histone modification and identified global associations between temperature and histone changes that suggest epigenetic remodeling as a result of behavioral fever. Together, these results highlight the critical importance of thermal choice in mobile ectotherms, particularly in response to an infection, and demonstrate the key role of epigenetic modification to orchestrate the thermocoupling of the immune response during behavioral fever.</p