scholarly journals Transfer of humoural immunity over two generations in urban pigeons

2015 ◽  
Vol 11 (11) ◽  
pp. 20150780 ◽  
Author(s):  
A. Ismail ◽  
L. Jacquin ◽  
C. Haussy ◽  
S. Perret ◽  
J. Gasparini
Keyword(s):  
Immune Response ◽  
Egg Yolk ◽  
Columba Livia ◽  
Maternal Antibodies ◽  
Keyhole Limpet Haemocyanin ◽  
Passive Protection ◽  
Specific Antibodies ◽  
Immune Profile ◽  
Two Generations ◽  
Underlying Mechanisms

Maternal antibodies (MatAb) are known to provide passive protection early in life for young vertebrates but their effects on the development of offspring immune response across generations are still unknown. Here, we investigated the effects of antigen exposure (keyhole limpet haemocyanin, KLH) experienced by urban pigeon ( Columba livia ) females on the amount of antigen-specific antibodies (Abs) transferred into the egg yolk of their daughters and on the humoural immune response towards this same antigen in their grandchildren. We found that chicks from KLH-injected maternal grandmothers had a higher humoural response than chicks from sham-injected grandmothers. However, we did not detect a significant effect of female KLH exposure on the ability of their daughters to transmit anti-KLH Abs into their eggs. These results suggest that antigen exposure at one generation may shape the immune profile of offspring over two next generations, although the underlying mechanisms remain to be investigated.

scholarly journals Humoral immunity in puppies of immune bitches vaccinated with an attenuated and inactivated

2002 ◽  
Vol 56 (5-6) ◽  
pp. 285-294 ◽  
Author(s):  
Dragan Bacic ◽  
Sonja Obrenovic ◽  
Miroslav Valcic ◽  
Dragisa Trailovic ◽  
Djordje Dobric
Keyword(s):  
Immune Response ◽  
Humoral Immunity ◽  
Humoral Immune Response ◽  
Maternal Antibodies ◽  
Inactivated Vaccine ◽  
Specific Antibodies ◽  
Humoral Immune ◽  
Attenuated Vaccine ◽  
Expected Increase

In order to examine the humoral immune response to a vaccine against canine parvoviruses in puppies of immune bitches, vaccinated during gravidity, an experiment was performed on a total of 56 puppies from 10 litters, which were vaccinated three times, on the 7th, 11th, and 17th weeks of life. One group of puppies was vaccinated with an attenuated vaccine, while another was vaccinated with an inactivated vaccine. The titer of maternal antibodies and the vaccine - induced titer of specific antibodies were examined using the IHA test. The titer of maternal antibodies in puppies before the first vaccination ranged from <20 to 1:80. Following vaccination, we established an expected increase in the titer of specific antibodies, over 1:160 without more significant differences between the two types of vaccines.

scholarly journals MITF induces escape from innate immunity in melanoma

2021 ◽  
Vol 40 (1) ◽  
Author(s):  
Luis Sánchez-del-Campo ◽  
Román Martí-Díaz ◽  
María F. Montenegro ◽  
Rebeca González-Guerrero ◽  
Trinidad Hernández-Caselles ◽  
...  
Keyword(s):  
Immune Response ◽  
Immune System ◽  
Nk Cells ◽  
Nk Cell ◽  
Luciferase Reporter ◽  
Damage Repair ◽  
Reporter Assays ◽  
Underlying Mechanisms ◽  
Nk Cytotoxicity

Abstract Background The application of immune-based therapies has revolutionized cancer treatment. Yet how the immune system responds to phenotypically heterogeneous populations within tumors is poorly understood. In melanoma, one of the major determinants of phenotypic identity is the lineage survival oncogene MITF that integrates diverse microenvironmental cues to coordinate melanoma survival, senescence bypass, differentiation, proliferation, invasion, metabolism and DNA damage repair. Whether MITF also controls the immune response is unknown. Methods By using several mouse melanoma models, we examine the potential role of MITF to modulate the anti-melanoma immune response. ChIP-seq data analysis, ChIP-qPCR, CRISPR-Cas9 genome editing, and luciferase reporter assays were utilized to identify ADAM10 as a direct MITF target gene. Western blotting, confocal microscopy, flow cytometry, and natural killer (NK) cytotoxicity assays were used to determine the underlying mechanisms by which MITF-driven phenotypic plasticity modulates melanoma NK cell-mediated killing. Results Here we show that MITF regulates expression of ADAM10, a key sheddase that cleaves the MICA/B family of ligands for NK cells. By controlling melanoma recognition by NK-cells MITF thereby controls the melanoma response to the innate immune system. Consequently, while melanoma MITFLow cells can be effectively suppressed by NK-mediated killing, MITF-expressing cells escape NK cell surveillance. Conclusion Our results reveal how modulation of MITF activity can impact the anti-melanoma immune response with implications for the application of anti-melanoma immunotherapies.

scholarly journals The Liver and the Hepatic Immune Response in Trypanosoma cruzi Infection, a Historical and Updated View

Pathogens ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1074
Author(s):  
Natalia Vacani-Martins ◽  
Marcelo Meuser-Batista ◽  
Carina de Lima Pereira dos Santos ◽  
Alejandro Marcel Hasslocher-Moreno ◽  
Andrea Henriques-Pons
Keyword(s):  
Immune Response ◽  
Trypanosoma Cruzi ◽  
Chagas Disease ◽  
Clinical Signs ◽  
Cell Types ◽  
Experimental Models ◽  
Chronic Patients ◽  
The Usa ◽  
Multiple Cell ◽  
Underlying Mechanisms

Chagas disease was described more than a century ago and, despite great efforts to understand the underlying mechanisms that lead to cardiac and digestive manifestations in chronic patients, much remains to be clarified. The disease is found beyond Latin America, including Japan, the USA, France, Spain, and Australia, and is caused by the protozoan Trypanosoma cruzi. Dr. Carlos Chagas described Chagas disease in 1909 in Brazil, and hepatomegaly was among the clinical signs observed. Currently, hepatomegaly is cited in most papers published which either study acutely infected patients or experimental models, and we know that the parasite can infect multiple cell types in the liver, especially Kupffer cells and dendritic cells. Moreover, liver damage is more pronounced in cases of oral infection, which is mainly found in the Amazon region. However, the importance of liver involvement, including the hepatic immune response, in disease progression does not receive much attention. In this review, we present the very first paper published approaching the liver’s participation in the infection, as well as subsequent papers published in the last century, up to and including our recently published results. We propose that, after infection, activated peripheral T lymphocytes reach the liver and induce a shift to a pro-inflammatory ambient environment. Thus, there is an immunological integration and cooperation between peripheral and hepatic immunity, contributing to disease control.

scholarly journals Diversity and function of maternal HIV-1-specific antibodies at the time of vertical transmission

2019 ◽  
Author(s):  
Laura E. Doepker ◽  
Cassandra A. Simonich ◽  
Duncan Ralph ◽  
Theodore Gobillot ◽  
Meghan Garrett ◽  
...  
Keyword(s):  
Vertical Transmission ◽  
Single Mother ◽  
Antiviral Treatment ◽  
Maternal Antibodies ◽  
Cell Repertoire ◽  
Human Infants ◽  
Low Frequencies ◽  
Specific Antibodies ◽  
Transmitted Virus ◽  
Hiv 1

AbstractInfants of HIV positive mothers can acquire HIV infection by various routes, but even in the absence of antiviral treatment, the majority of these infants do not become infected. There is evidence that maternal antibodies may provide some protection from infection, but gestational maternal antibodies have not yet been characterized in detail. One of the most studied vertically-infected infants is BG505, as the virus from this infant yielded an Envelope protein that was successfully developed as a stable trimer. Here, we isolated and characterized 39 HIV-specific neutralizing monoclonal antibodies (nAbs) from MG505, the mother of BG505, at a time point just prior to vertical transmission. These nAbs belonged to 21 clonal families, employed a variety of VH genes, many were specific for the HIV-1 Env V3 loop, and this V3 specificity correlated with measurable antibody-dependent cellular cytotoxicity (ADCC) activity. The isolated nAbs did not recapitulate the full breadth of heterologous nor autologous virus neutralization by contemporaneous plasma. Notably, we found that the V3-targeting nAb families neutralized one particular maternal Env variant even though all tested variants had low V3 sequence diversity and were measurably bound by these nAbs. None of the nAbs neutralized the BG505 transmitted virus. Furthermore, the MG505 nAb families were found at relatively low frequencies within the maternal B cell repertoire: all less than 0.25% of total IgG sequences. Our findings demonstrate the diversity of HIV-1 nAbs that exist within a single mother, resulting in a collection of antibody specificities that can shape the transmission bottleneck.ImportanceMother-to-child-transmission of HIV-1 offers a unique setting in which maternal antibodies both within the mother and passively-transferred to the infant are present at the time of viral exposure. Untreated HIV-exposed human infants are infected at a rate of 30-40%, meaning that some infants do not get infected despite continued exposure to virus. Since the potential of HIV-specific immune responses to provide protection against HIV is a central goal of HIV vaccine design, understanding the nature of maternal antibodies may provide insights into immune mechanisms of protection. In this study, we isolated and characterized HIV-specific antibodies from the mother of an infant whose transmitted virus has been well studied.

scholarly journals Distinct cellular immune profiles in the airways and blood of critically ill patients with COVID-19

2020 ◽  
Author(s):  
Anno Saris ◽  
Tom D.Y. Reijnders ◽  
Esther J. Nossent ◽  
Alex R. Schuurman ◽  
Jan Verhoeff ◽  
...  
Keyword(s):  
Immune Response ◽  
T Cells ◽  
T Cell ◽  
T Cell Activation ◽  
Peripheral Blood ◽  
Cell Activation ◽  
Effector Memory ◽  
Activated T Cells ◽  
Immune Profile ◽  
Prolonged Icu Stay

AbstractOur understanding of the coronavirus disease-19 (COVID-19) immune response is almost exclusively derived from studies that examined blood. To gain insight in the pulmonary immune response we analysed BALF samples and paired blood samples from 17 severe COVID-19 patients. Macrophages and T cells were the most abundant cells in BALF. In the lungs, both CD4 and CD8 T cells were predominantly effector memory cells and expressed higher levels of the exhaustion marker PD-1 than in peripheral blood. Prolonged ICU stay associated with a reduced proportion of activated T cells in peripheral blood and even more so in BALF. T cell activation in blood, but not in BALF, was higher in fatal COVID-19 cases. Increased levels of inflammatory mediators were more pronounced in BALF than in plasma. In conclusion, the bronchoalveolar immune response in COVID-19 has a unique local profile that strongly differs from the immune profile in peripheral blood.SummaryThe bronchoalveolar immune response in severe COVID-19 strongly differs from the peripheral blood immune profile. Fatal COVID-19 associated with T cell activation blood, but not in BALF.

scholarly journals Mechanistic within-host models of the asexual Plasmodium falciparum infection: a review and analytical assessment

2021 ◽  
Author(s):  
Flavia Camponovo ◽  
Tamsin E Lee ◽  
Jonathan Russell ◽  
Lydia Burgert ◽  
Jaline Gerardin ◽  
...  
Keyword(s):  
Immune Response ◽  
Immune Responses ◽  
Immune Escape ◽  
Clinical Symptoms ◽  
Disease Onset ◽  
Clinical Malaria ◽  
Individual Variability ◽  
Switching Dynamics ◽  
Underlying Mechanisms ◽  
Parasite Dynamics

Background: Malaria blood-stage infection length and intensity are important drivers of disease and transmission; however, the underlying mechanisms of parasite growth and the host's immune response during infection remain largely unknown. Over the last 30 years, several mechanistic mathematical models of malaria parasite within-host dynamics have been published and used in malaria transmission models. Methods: We identified mechanistic within-host models of parasite dynamics through a review of published literature. For a subset of these, we reproduced model code and compared descriptive statistics between the models using fitted data. Through simulation and model analysis, we compare and discuss key features of the models, including assumptions on growth, immune response components, variant switching mechanisms, and inter-individual variability. Results: The assessed within-host malaria models generally replicate infection dynamics in malaria-na&iumlve individuals. However, there are substantial differences between the model dynamics after disease onset, and models do not always reproduce late infection parasitemia data used for calibration of the within host infections. Models have attempted to capture the considerable variability in parasite dynamics between individuals by including stochastic parasite multiplication rates; variant switching dynamics leading to immune escape; variable effects of the host immune responses; or via probabilistic events. For models that capture realistic length of infections, model representations of innate immunity explain early peaks in infection density that cause clinical symptoms, and model representations of antibody immune responses control the length of infection. Models differed in their assumptions concerning variant switching dynamics, reflecting uncertainty in the underlying mechanisms of variant switching revealed by recent clinical data during early infection. Overall, given the scarce availability of the biological evidence there is limited support for complex models. Conclusions: Our study suggests that much of the inter-individual variability observed in clinical malaria infections has traditionally been attributed in models to random variability, rather than mechanistic disease dynamics. Thus, we propose that newly developed models should assume simple immune dynamics that minimally capture mechanistic understandings and avoid over-parameterisation and large stochasticity which inaccurately represent unknown disease mechanisms.

Pregnancy and velvet

2021 ◽  
Vol 65 (04) ◽  
pp. 86-88
Author(s):  
Sevinc Nadir qızı Kerimova ◽  
Keyword(s):  
Immune Response ◽  
Laboratory Test ◽  
Key Words ◽  
Rubella Virus ◽  
The Body ◽  
Key Words Pregnancy ◽  
Specific Antibodies ◽  
Rubella Infection

The main prevention of rubella infection during pregnancy is to be vaccinated against this disease in preparation for pregnancy. Before you decide to get vaccinated against rubella, you need to have a special laboratory test to detect antibodies to the rubella virus in your blood to check if you are immune to this infection. The fact is that in some cases it is impossible to determine whether you are sick with rubella. Because in many cases, the disease can be latent or with a very limited number of symptoms, in which case, naturally, the body develops specific antibodies against the virus. Doctors believe that in this case, the body's immune response will be strengthened. It is recommended that the velvet vaccine be given at least 3 months before the planned date of pregnancy. Key words: pregnancy, rubella, fetus, infection

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