scholarly journals Identification of an interleukin (IL)-25–dependent cell population that provides IL-4, IL-5, and IL-13 at the onset of helminth expulsion

2006 ◽  
Vol 203 (4) ◽  
pp. 1105-1116 ◽  
Author(s):  
Padraic G. Fallon ◽  
Sarah J. Ballantyne ◽  
Niamh E. Mangan ◽  
Jillian L. Barlow ◽  
Ayan Dasvarma ◽  
...  
Keyword(s):  
Nippostrongylus Brasiliensis ◽  
T Helper ◽  
T Helper 2 ◽  
Adaptive Immune ◽  
Type 2 Cytokines ◽  
Dependent Cell ◽  
Worm Expulsion ◽  
Draining Lymph Nodes

Type 2 immunity, which involves coordinated regulation of innate and adaptive immune responses, can protect against helminth parasite infection, but may lead to allergy and asthma after inappropriate activation. We demonstrate that il25−/− mice display inefficient Nippostrongylus brasiliensis expulsion and delayed cytokine production by T helper 2 cells. We further establish a key role for interleukin (IL)-25 in regulating a novel population of IL-4–, IL-5–, IL-13–producing non–B/non–T (NBNT), c-kit+, FcεR1− cells during helminth infection. A deficit in this population in il25−/− mice correlates with inefficient N. brasiliensis expulsion. In contrast, administration of recombinant IL-25 in vivo induces the appearance of NBNT, c-kit+, FcεR1− cells and leads to rapid worm expulsion that is T and B cell independent, but type 2 cytokine dependent. We demonstrate that these IL-25–regulated cells appear rapidly in the draining lymph nodes, implicating them as a source of type 2 cytokines during initiation of worm expulsion.

scholarly journals Anti-IL5 Drugs in COVID-19 Patients: Role of Eosinophils in SARS-CoV-2-Induced Immunopathology

2021 ◽  
Vol 12 ◽  
Author(s):  
Daniele Pala ◽  
Marco Pistis
Keyword(s):  
Immune Response ◽  
T Helper ◽  
T Helper 1 ◽  
Biological Drugs ◽  
T Helper 2 ◽  
Asthmatic Patients ◽  
Severe Asthmatic ◽  
Type 2 Cytokines ◽  
Type 2 Immune Response

SARS-CoV-2 infection stimulates a complex activation of the immune system. Eosinophils belong to the host’s defense equipment against respiratory viruses. In the first phase of the infection, eosinophils contribution is probably appropriate and beneficial, as they facilitate the suppression of the viral replication. However, in severe COVID-19 patients, during the second and third phases of the disease, eosinophils may participate in a maladaptive immune response and directly contribute to immunopathology. In fact, in severe patients, the immune response is prevalently T helper 1 type, but T helper 2 is also present. Eosinophils’ expansion and activation are stimulated by Type 2 cytokines, especially IL-5. Moreover, bronchial asthma, in which eosinophils play a central role, seems not to be a major risk factor for severe COVID-19. Among possible explanations, asthmatic patients are often treated with corticosteroids, which have been demonstrated to reduce the progression to critical COVID-19 in hospitalized patients. In addition to steroids, severe asthmatic patients are currently treated with biological drugs that target Type 2 immune response. Because IL-5 is necessary for the growth, survival, and activation of eosinophils, IL-5 inhibitors, such as mepolizumab, decrease the peripheral blood count of eosinophils, but do not influence eosinophils activation in the airway. In severe COVID-19 patients, the blockade of eosinophils’ activation might contrast harmful immunity.

Nippostrongylus brasiliensis: further properties of antibody-damaged worms and induction of comparable damage by maintaining worms in vitro

Parasitology ◽  
1975 ◽  
Vol 71 (2) ◽  
pp. 275-283 ◽  
Author(s):  
R. J. Love ◽  
Bridget M. Ogilvie ◽  
Diane J. McLaren
Keyword(s):  
Immune Response ◽  
Isoenzyme Pattern ◽  
Nippostrongylus Brasiliensis ◽  
Ultrastructural Morphology ◽  
Immature Rats ◽  
Normal Rat ◽  
Worm Expulsion ◽  
Anterior Migration

When adult Nippostrongylus brasiliensis were maintained in vitro they became damaged. Using the criteria of ultrastructural morphology, acetylcholinesterase isoenzyme pattern and the behaviour of the worms after transfer to a normal rat, this damage appeared to be similar to that produced by the in vivo action of antibodies.Antibodies were shown to be responsible for the anterior migration of adult worms which occurs during primary infections in mature rats and in the prolonged infections seen in lactating and immature rats.Antibody damaged worms and worms unaffected by antibodies were equally able to stimulate the immune response required for worm expulsion. Apparently antibody damage is not required for the initiation of the second immune component necessary for expulsion of this parasite.

scholarly journals Role of beta1 and beta2 subunits of the interleukin-12 receptor in determining T helper 1/T helper 2 responses in vivo in the rat

Immunology ◽  
2000 ◽  
Vol 99 (1) ◽  
pp. 109-112 ◽  
Author(s):  
K. M. Gillespie ◽  
C.-C. Szeto ◽  
V. M. Betin ◽  
P. W. Mathieson
Keyword(s):  
Interleukin 12 ◽  
T Helper ◽  
T Helper 1 ◽  
T Helper 2

scholarly journals Cc Chemokine Receptor (Ccr)3/Eotaxin Is Followed by Ccr4/Monocyte-Derived Chemokine in Mediating Pulmonary T Helper Lymphocyte Type 2 Recruitment after Serial Antigen Challenge in Vivo

2000 ◽  
Vol 191 (2) ◽  
pp. 265-274 ◽  
Author(s):  
Clare M. Lloyd ◽  
Tracy Delaney ◽  
Trang Nguyen ◽  
Jane Tian ◽  
Carlos Martinez-A ◽  
...  
Keyword(s):  
Chemokine Receptor ◽  
Progressive Increase ◽  
Allergic Airway Disease ◽  
Antigen Challenge ◽  
Th2 Cells ◽  
T Helper ◽  
Cc Chemokine

Isolated peripheral blood CD4 cells from allergic individuals express CC chemokine receptor (CCR)3 and CCR4 after expansion in vitro. In addition, human T helper type 2 (Th2) cells polarized in vitro selectively express CCR3 and CCR4 at certain stages of activation/differentiation and respond preferentially to the ligands eotaxin and monocyte-derived chemokine (MDC). However, controversy arises when the in vivo significance of this distinct expression is discussed. To address the functional role of CCR3/eotaxin and CCR4/MDC during the in vivo recruitment of Th2 cells, we have transferred effector Th cells into naive mice to induce allergic airway disease. Tracking of these cells after repeated antigen challenge has established that both CCR3/eotaxin and CCR4/MDC axes contribute to the recruitment of Th2 cells to the lung, demonstrating the in vivo relevance of the expression of these receptors on Th2 cells. We have shown that involvement of the CCR3/eotaxin pathway is confined to early stages of the response in vivo, whereas repeated antigen stimulation results in the predominant use of the CCR4/MDC pathway. We propose that effector Th2 cells respond to both CCR3/eotaxin and CCR4/MDC pathways initially, but that a progressive increase in CCR4-positive cells results in the predominance of the CCR4/MDC axis in the long-term recruitment of Th2 cells in vivo.

Basophil effector function and homeostasis during helminth infection

Blood ◽  
2009 ◽  
Vol 113 (12) ◽  
pp. 2816-2825 ◽  
Author(s):  
Caspar Ohnmacht ◽  
David Voehringer
Keyword(s):  
De Novo ◽  
Allergic Inflammation ◽  
Lung Parenchyma ◽  
Effector Function ◽  
Nippostrongylus Brasiliensis ◽  
Helminth Parasites ◽  
Alternatively Activated Macrophages ◽  
Effector Cells ◽  
Worm Expulsion

AbstractBasophils are effector cells of the innate immune system that are associated with allergic inflammation and infections with helminth parasites. However, their development and in vivo functions are largely unknown. Here, we characterize basophil development, turnover, tissue localization, and effector function during infection with the helminth Nippostrongylus brasiliensis. Our results demonstrate that under homeostatic conditions basophils have a lifespan of about 60 hours. N brasiliensis–induced basophilia is caused by increased de novo production of basophils in the bone marrow. Basophils were found near the marginal zone in the red pulp of the spleen, in the lamina propria of the small intestine, and in the lung parenchyma. Activated basophils promoted systemic eosinophilia, were associated with differentiation of alternatively activated macrophages in the lung, and contributed to efficient worm expulsion, demonstrating that basophils play a crucial role as effector cells in type 2 immune responses.

scholarly journals Prostaglandin D2 Selectively Induces Chemotaxis in T Helper Type 2 Cells, Eosinophils, and Basophils via Seven-Transmembrane Receptor Crth2

2001 ◽  
Vol 193 (2) ◽  
pp. 255-262 ◽  
Author(s):  
Hiroyuki Hirai ◽  
Kazuya Tanaka ◽  
Osamu Yoshie ◽  
Kazuyuki Ogawa ◽  
Kazumi Kenmotsu ◽  
...  
Keyword(s):  
Allergic Inflammation ◽  
Allergic Diseases ◽  
Th2 Cells ◽  
Prostaglandin D2 ◽  
Dependent Manner ◽  
T Helper ◽  
Dependent Cell ◽  
Blood Eosinophils ◽  
Helper Type

Prostaglandin (PG)D2, which has long been implicated in allergic diseases, is currently considered to elicit its biological actions through the DP receptor (DP). Involvement of DP in the formation of allergic asthma was recently demonstrated with DP-deficient mice. However, proinflammatory functions of PGD2 cannot be explained by DP alone. We show here that a seven-transmembrane receptor, CRTH2, which is preferentially expressed in T helper type 2 (Th2) cells, eosinophils, and basophils in humans, serves as the novel receptor for PGD2. In response to PGD2, CRTH2 induces intracellular Ca2+ mobilization and chemotaxis in Th2 cells in a Gαi-dependent manner. In addition, CRTH2, but not DP, mediates PGD2-dependent cell migration of blood eosinophils and basophils. Thus, PGD2 is likely involved in multiple aspects of allergic inflammation through its dual receptor systems, DP and CRTH2.

T-HELPER-1 AND T-HELPER-2 IMMUNE RESPONSES IN MICE INFECTED WITH THE INTESTINAL FLUKE NEODIPLOSTOMUM SEOULENSE: THEIR POSSIBLE ROLES IN WORM EXPULSION AND HOST FATALITY

2007 ◽  
Vol 93 (5) ◽  
pp. 1036-1045 ◽  
Author(s):  
Eun-Hee Shin ◽  
Sang-Hyup Lee ◽  
Jae-Lip Kim ◽  
Yun-Kyu Park ◽  
Jong-Yil Chai
Keyword(s):  
Immune Responses ◽  
T Helper ◽  
T Helper 1 ◽  
T Helper 2 ◽  
Worm Expulsion
Sign in / Sign up

Export Citation Format

Share Document