scholarly journals Computational Modeling of Microabscess Formation

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
Alexandre Bittencourt Pigozzo ◽  
Gilson Costa Macedo ◽  
Rodrigo Weber dos Santos ◽  
Marcelo Lobosco
Keyword(s):  
Immune Response ◽  
Immune System ◽  
Computational Modeling ◽  
Bacterial Infection ◽  
Computational Model ◽  
Immune Cells ◽  
Bacterial Infections ◽  
Distinct Pattern ◽  
Human Immune System ◽  
Human Immune

Bacterial infections can be of two types: acute or chronic. The chronic bacterial infections are characterized by being a large bacterial infection and/or an infection where the bacteria grows rapidly. In these cases, the immune response is not capable of completely eliminating the infection which may lead to the formation of a pattern known as microabscess (or abscess). The microabscess is characterized by an area comprising fluids, bacteria, immune cells (mainly neutrophils), and many types of dead cells. This distinct pattern of formation can only be numerically reproduced and studied by models that capture the spatiotemporal dynamics of the human immune system (HIS). In this context, our work aims to develop and implement an initial computational model to study the process of microabscess formation during a bacterial infection.

scholarly journals A comprehensive logic-based model of the human immune system to study the dynamics responses to mono- and coinfections

2020 ◽  
Author(s):  
Bhanwar Lal Puniya ◽  
Robert Moore ◽  
Akram Mohammed ◽  
Rada Amin ◽  
Alyssa La Fleur ◽  
...  
Keyword(s):  
Immune Response ◽  
Immune System ◽  
Immune Responses ◽  
Immune Cells ◽  
Computational Models ◽  
Single Infection ◽  
Human Immune System ◽  
Adaptive Immune ◽  
Adaptive Immune Cells ◽  
Human Immune

AbstractThe human immune system, which protects against pathogens and diseases, is a complex network of cells and molecules. The effects of complex dynamical interactions of pathogens and immune cells on the immune response can be studied using computational models. However, a model of the entire immune system is still lacking. Here, we developed a comprehensive computational model that integrates innate and adaptive immune cells, cytokines, immunoglobulins, and nine common pathogens from different classes of virus, bacteria, parasites, and fungi. This model was used to investigate the dynamics of the immune system under two scenarios: (1) single infection with pathogens, and (2) various medically relevant pathogen coinfections. In coinfections, we found that the order of infecting pathogens has a significant impact on the dynamics of cytokines and immunoglobulins. Thus, our model provides a tool to simulate immune responses under different dosage of pathogens and their combinations, which can be further extended and used as a tool for drug discovery and immunotherapy. Furthermore, the model provides a comprehensive and simulatable blueprint of the human immune system as a result of the synthesis of the vast knowledge about the network-like interactions of various components of the system.

scholarly journals Humanized Mice, a New Model To Study the Influence of Drug Treatment on Neonatal Sepsis

2013 ◽  
Vol 81 (5) ◽  
pp. 1520-1531 ◽  
Author(s):  
Wolfgang Ernst ◽  
Nicole Zimara ◽  
Frank Hanses ◽  
Daniela N. Männel ◽  
Birgit Seelbach-Göbel ◽  
...  
Keyword(s):  
Immune Response ◽  
Immune System ◽  
Bacterial Infection ◽  
Perinatal Care ◽  
Bacterial Load ◽  
Humanized Mice ◽  
Western World ◽  
Human Immune System ◽  
New Model ◽  
Human Immune

ABSTRACTBacterial infection with group BStreptococcus(GBS) represents a prominent threat to neonates and fetuses in the Western world, causing severe organ damage and even death. To improve current therapeutic strategies and to investigate new approaches, an appropriatein vivomodel to study the immune response of a human immune system is needed. Therefore, we introduced humanized mice as a new model for GBS-induced sepsis. Humanized mice feature deficiencies similar to those found in neonates, such as lower immunoglobulin levels and myeloid cell dysfunction. Due to the husbandry in specific-pathogen-free (SPF) facilities, the human immune cells in these mice also exhibit a naive phenotype which mimics the conditions in fetuses/neonates. Following infection, cytokine release and leukocyte trafficking from the bone marrow to the lymphoid organ (spleen) and into the peritoneum (site of infection) as well as bacterial spreading and clearance were traceable in the humanized mice. Furthermore, we investigated the effects of betamethasone and indomethacin treatment using this novel sepsis model. Although both drugs are commonly used in perinatal care, little is known about their effects on the neonatal immune system. Treatment of infected humanized mice not only induced the reduction of human leukocytes in the spleen but also increased the bacterial load in all analyzed organs, including the brain, which did not show infiltration of live GBS in untreated controls. These studies demonstrate the utility of the humanized mice as a new model to study an immature human immune response during bacterial infection and allow the investigation of side effects induced by various treatments.

On the use of multiple heterogeneous devices to speedup the execution of a computational model of the Human Immune System

2015 ◽  
Vol 267 ◽  
pp. 304-313 ◽  
Author(s):  
T.M. do Nascimento ◽  
J.M. de Oliveira ◽  
M.P. Xavier ◽  
A.B. Pigozzo ◽  
R.W. dos Santos ◽  
...  
Keyword(s):  
Immune System ◽  
Computational Model ◽  
Human Immune System ◽  
Heterogeneous Devices ◽  
Human Immune

scholarly journals On the Coupling of Two Models of the Human Immune Response to an Antigen

2014 ◽  
Vol 2014 ◽  
pp. 1-19 ◽  
Author(s):  
Bárbara de M. Quintela ◽  
Rodrigo Weber dos Santos ◽  
Marcelo Lobosco
Keyword(s):  
Immune Response ◽  
Sensitivity Analysis ◽  
Immune System ◽  
Differential Equations ◽  
Immune Cells ◽  
Coupled Model ◽  
Systemic Response ◽  
Defense System ◽  
Human Immune Response ◽  
Human Immune

The development of mathematical models of the immune response allows a better understanding of the multifaceted mechanisms of the defense system. The main purpose of this work is to present a scheme for coupling distinct models of different scales and aspects of the immune system. As an example, we propose a new model where the local tissue inflammation processes are simulated with partial differential equations (PDEs) whereas a system of ordinary differential equations (ODEs) is used as a model for the systemic response. The simulation of distinct scenarios allows the analysis of the dynamics of various immune cells in the presence of an antigen. Preliminary results of this approach with a sensitivity analysis of the coupled model are shown but further validation is still required.

scholarly journals Mecanismos de la respuesta inmune adaptativa: respuesta específica y de protección a largo plazo

2020 ◽  
Vol 3 (8) ◽  
pp. 25-43
Author(s):  
William de Jesús Ríos-Ríos ◽  
Jair Aguilar-Cruz
Keyword(s):  
Immune Response ◽  
Immune System ◽  
Adaptive Immune Response ◽  
Molecular Structures ◽  
Pathogenic Microorganism ◽  
Human Immune System ◽  
Adaptive Immune ◽  
Specific Immunity ◽  
Human Immune

The human immune system has evolvedtoachieveahighlyefficient, specialized and specific immunity against particular molecular structures of each pathogenic microorganism and to develop mechanisms allowing to respond more quickly and efficiently to subsequent encounters with the same invading agent: the adaptive immune response. This paper describes the connection between the innate and adaptive immune response, as well as the cellular and humoral mechanisms of control and long-term protection of the adaptive immune response.

scholarly journals COVID-19: human immune response and the influence of food ingredients and active compounds

2021 ◽  
Vol 4 (6) ◽  
pp. 100
Author(s):  
Raphael Ayivi ◽  
Salam Ibrahim ◽  
Heather Colleran ◽  
Roberta Silva ◽  
Leonard Williams ◽  
...  
Keyword(s):  
Immune Response ◽  
Immune System ◽  
Viral Infections ◽  
Critical Element ◽  
Human Immune System ◽  
Active Compounds ◽  
Food Ingredients ◽  
Influence Of Food ◽  
Human Immune ◽  
The Impact

The human immune system is the first line of defense in the prevention of viruses and diseases, and several immune response mechanisms are engaged at the onset of a pathogenic attack. In this review, we elucidate the human immune system as a critical element in protecting humans from COVID-19 by describing the immune process, explaining how the immune system functions, and highlighting the immune system’s global importance in fighting infections. Potential challenges that limit the  proper functioning of the immune system are also discussed. In addition, we address the impact of nutrition on boosting the body’s defenses against COVID-19. For example, some foods and active compounds from food ingredients have been suggested as a way to strengthen the immune system. Physical exercise has also been encouraged as an important way to support the immune response to viral infections. The aim of this review is thus to outline holistic self-defense immunity mechanisms that can help to reduce the risk of viral infections in humans. This review could therefore be used as a comprehensive resource for educating consumers and the general public about measures that can enhance the body’s immune support system as we continue to fight COVID-19 and its variants.Keywords: Immunity, Covid-19 COVID-19, Nutrition, Bioactive compounds, Food Ingredients

scholarly journals Beyond Metabolism: Role of the Immune System in Hepatic Toxicity

2020 ◽  
Vol 39 (2) ◽  
pp. 151-164
Author(s):  
Kenneth L. Hastings ◽  
Martin D. Green ◽  
Bin Gao ◽  
Patricia E. Ganey ◽  
Robert A. Roth ◽  
...  
Keyword(s):  
Immune System ◽  
Liver Injury ◽  
Bacterial Infection ◽  
Immune Cells ◽  
Bacterial Infections ◽  
Hepatic Toxicity ◽  
Drug Induced ◽  
Host Immune Responses ◽  
Disease Spectrum

The liver is primarily thought of as a metabolic organ; however, the liver is also an important mediator of immunological functions. Key perspectives on this emerging topic were presented in a symposium at the 2018 annual meeting of the American College of Toxicology entitled “Beyond metabolism: Role of the immune system in hepatic toxicity.” Viral hepatitis is an important disease of the liver for which insufficient preventive vaccines exist. Host immune responses inadequately clear these viruses and often potentiate immunological inflammation that damages the liver. In addition, the liver is a key innate immune organ against bacterial infection. Hepatocytes and immune cells cooperatively control systemic and local bacterial infections. Conversely, bacterial infection can activate multiple types of immune cells and pathways to cause hepatocyte damage and liver injury. Finally, the immune system and specifically cytokines and drugs can interact in idiosyncratic drug-induced liver injury. This rare disease can result in a disease spectrum that ranges from mild to acute liver failure. The immune system plays a role in this disease spectrum.

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