The influence of dehydroepiandrosterone on effector functions of neutrophils

Dehydroepiandrosterone (DHEA) is a steroid hormone secreted by the adrenal glands, gonads and brain. It is a precursor to sex hormones and also is known to have immune modulatory activity. However, little is known about the relationship between DHEA and neutrophils and thus our study evaluates the influence of DHEA in the effector functions of neutrophils. Human neutrophils were treated in vitro with DHEA and further infected with Salmonella enterica serovar Typhimurium. The treatment of neutrophils with 0.01 µM of DHEA increased the phagocytosis of Salmonella independent of TLR4 as the treatment did not modulate the TLR4 expression. Additionally, DHEA caused a decrease in ROS (reactive oxygen species) production and did not influence the formation of the neutrophil extracellular trap (NET). Steroid treated neutrophils, infected or stimulated with LPS (lipopolysaccharide), showed reduced production of IL-8, compared to untreated cells. Also, the protein levels of p-NFκB were decreased in neutrophils treated with DHEA, and this reduction could explain the reduced levels of IL-8. These results led us to conclude that the steroid hormone DHEA has important modulatory functions in neutrophils

Ejercicio y sistema inmune / Exercise and the immune system

Se ha demostrado que el ejercicio hecho a diferentes intensidades cumple una función moduladora sobre diversos sistemas, y que su acción sobre la respuesta inmune es de gran importancia. Por lo tanto, es necesario esclarecer si estos cambios constituyen efectos benéficos o perjudiciales en cuanto a las adaptaciones del hospedero frente a diversos agentes patógenos. El estudio de estos cambios inducidos por el estrés físico puede tener un impacto grande en la comprensión y prevención de algunas enfermedades que involucran la respuesta del sistema inmune como las alergias, las infecciones, las inmunodeficiencias y el cáncer. En este artículo se presenta una revisión actualizada de la información existente al respecto, con el propósito de aportar elementos que ayuden a comprender este fenómeno biológico, así como sus implicaciones para la salud humana. Se han estudiado varios parámetros de la respuesta inmune durante el ejercicio físico, entre ellos su relación con la respuesta hormonal al estrés y el comportamiento de las diferentes hormonas de acuerdo con la intensidad de aquél. También se han evaluado los cambios en las poblaciones de células sanguíneas (linfocitos, monocitos y neutrófilos) así como el comportamiento de las citoquinas y la síntesis de inmunoglobulinas específicas. Todo esto ha permitido establecer una relación entre los sistemas inmune y neuroendocrino, la cual explicaría en gran medida los diferentes cambios que ocurren durante la actividad física en la respuesta y la adaptación inmunes, así como las diferencias de acuerdo con la intensidad y la frecuencia del estrés físico

It has been demonstrated that physical exercise, carried out at diverse intensities, modulates the function of different human body systems, and that it plays a major role in the immune response. Therefore, it is necessary to find out if these changes have benefic or harmful effects on the host adaptation against several pathogenic agents. The study of these physical-stress-induced changes might have a great impact on the comprehension and prevention of some diseases that involve activation of the immune system such as allergies, infections, immunodeficiencies and cancer. This article presents a review of current information concerning this area, with the purpose of providing concepts to help readers understand this biological phenomena and their implications in human health. Several immune response parameters have been studied during physical exercise, including their relationship with the stress-induced hormonal response and the profile of different hormones according to the intensity of physical activity. Also, changes in blood cell populations (lymphocytes, monocytes and neutrophils) and the behavior of cytokines and the synthesis of specific immune globulins have been assessed. This knowledge has allowed to establish a relationship between the immune and neuroendocrine systems, which might explain the various changes in the immune response and the adaptation seen in physical activity, as well as the differences found at diverse exercise intensity and frequency levels

The expression of ACTH receptor and 5-HT_(1A) receptor in human lymphoid tissues / 中国免疫学杂志

0.05).Conclusion:The lymphoid tissues can not only express the ACTH-R?5-HT_ 1A-R protein but also synthesize their mRNA.ACTH and 5-HT can regulate the functions of the immune system through their receptors on the membrane of the immunocytes.

IL-1?,IL-6 levels and SOCS-3 gene expression in hypothalamus of BALB/c mice with brain asymmetry / 中国免疫学杂志

Objective:To investigate the effects of brain asymmetry on levels of IL-1?,IL-6 and suppressor of cytokine signaling-3(SOCS-3) in hypothalamus,to get better understanding of relationship between brain asymmetry and neuro-immuno-endocrine network at the molecular level.Methods:By using paw preference test,right-pawed,left-pawed,and ambidextrous mice model was established.After decapitation of the mice,hypothalamus was separated rapidly.Some samples were homogenized and used for detection of levels of interleukin-1?(IL-1?),interleukin-6(IL-6) by Enzyme-Linked-Immunosorbent Assay(ELISA).The other samples were applied to detect SOCS-3 expression level by RT-PCR.Results:(1)The level of IL-6 in hypothalamus:left-pawed were higher than right-pawed mice,there was significant difference in statistics( P 0.05).(3)The expression level of SOCS-3:the SOCS-3 expression of right-pawed showed higher than left-pawed mice in hypothalamus,revealing a significant difference( P

The expression of 5-HT in normal lymph-node and lymphoma of human / 中国免疫学杂志

To find immunomorphologic evidence of interregulation between neuroendocrine system and immune system by detecting 5-HT in human normal lymph-node and lymphoma.Methods:Immunohistochemical SABC method and statistics analysis.Results:Thirty-three cases of lymph-nodes showd 5-HT positive expression.The positive rate of lymphoma is lower than that of normal lymph-node.The differences between human normal lymph-nodes and lymphoma are significant( P