scholarly journals Carbohydrate and Amino Acid Metabolism as Hallmarks for Innate Immune Cell Activation and Function

Cells ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 562 ◽  
Author(s):  
Haoxin Zhao ◽  
Lydia N. Raines ◽  
Stanley Ching-Cheng Huang
Keyword(s):  
Amino Acids ◽  
Immune Cells ◽  
Amino Acid Metabolism ◽  
Cell Activation ◽  
Acid Metabolism ◽  
Immune Cell ◽  
Innate Immune ◽  
Effector Functions ◽  
Immune Cell Activation ◽  
And Function

Immune activation is now understood to be fundamentally linked to intrinsic and/or extrinsic metabolic processes which are essential for immune cells to survive, proliferate, and perform their effector functions. Moreover, disruption or dysregulation of these pathways can result in detrimental outcomes and underly a number of pathologies in both communicable and non-communicable diseases. In this review, we discuss how the metabolism of carbohydrates and amino acids in particular can modulate innate immunity and how perturbations in these pathways can result in failure of these immune cells to properly function or induce unfavorable phenotypes.

Modulation of innate immune cell activation and function by Polysaccharide Krestin (PSK)

Planta Medica ◽  
2008 ◽  
Vol 74 (09) ◽  
Author(s):  
CA Wenner ◽  
H Wang ◽  
A Hill-Force ◽  
MR Martzen ◽  
MR Verneris
Keyword(s):  
Cell Activation ◽  
Immune Cell ◽  
Innate Immune ◽  
Innate Immune Cell ◽  
Immune Cell Activation ◽  
And Function

scholarly journals Amino acids: key sources for immunometabolites and immunotransmitters

2020 ◽  
Vol 32 (7) ◽  
pp. 435-446 ◽  
Author(s):  
Michio Miyajima
Keyword(s):  
Amino Acids ◽  
Immune Cells ◽  
Nicotinamide Adenine Dinucleotide ◽  
Cell Activation ◽  
Immune Cell ◽  
Nerve Cells ◽  
Metabolic Reprogramming ◽  
Functional Plasticity ◽  
Immune Cell Activation ◽  
Oxide Synthase

Abstract Immune-cell activation and functional plasticity are closely linked to metabolic reprogramming that is required to supply the energy and substrates for such dynamic transformations. During such processes, immune cells metabolize many kinds of molecules including nucleic acids, sugars and lipids, which is called immunometabolism. This review will mainly focus on amino acids and their derivatives among such metabolites and describe the functions of these molecules in the immune system. Although amino acids are essential for, and well known as, substrates for protein synthesis, they are also metabolized as energy sources and as substrates for functional catabolites. For example, glutamine is metabolized to produce energy through glutaminolysis and tryptophan is consumed to supply nicotinamide adenine dinucleotide, whereas arginine is metabolized to produce nitric acid and polyamine by nitric oxide synthase and arginase, respectively. In addition, serine is catabolized to produce nucleotides and to induce methylation reactions. Furthermore, in addition to their intracellular functions, amino acids and their derivatives are secreted and have extracellular functions as immunotransmitters. Many amino acids and their derivatives have been classified as neurotransmitters and their functions are clear as transmitters between nerve cells, or between nerve cells and immune cells, functioning as immunotransmitters. Thus, this review will describe the intracellular and external functions of amino acid from the perspective of immunometabolism and immunotransmission.

Neuroinflammation and Neurodegenerative Diseases

2016 ◽  
Author(s):  
Taylor R. Jay ◽  
Shane M. Bemiller ◽  
Lee E. Neilson ◽  
Paul J. Cheng-Hathaway ◽  
Bruce T. Lamb
Keyword(s):  
Neurodegenerative Diseases ◽  
Immune Cells ◽  
Cell Activation ◽  
Immune Cell ◽  
Active Role ◽  
Immune Cell Activation ◽  
Excitotoxic Damage ◽  
And Function ◽  
Inflammatory Molecules ◽  
The Brain

Neuroinflammation has long been associated with many neurodegenerative diseases (NDDs). Immune-related genetic and environmental risk factors have recently been identified for NDDs, suggesting that neuroinflammation can play an active role in modifying NDD pathologies. Immune cells that underlie this neuroinflammatory response can have both beneficial and detrimental roles in NDDs. These cells can engage in clearance of debris and provide important survival factors to neighboring neurons. However, these cells can also release inflammatory molecules that promote oxidative stress and excitotoxic damage in surrounding neurons, and aberrantly clear healthy cells and structures from the brain. In turn, the cells within the brain play important roles in determining the phenotype and function of these immune cells, and changes in the interaction among these cells in the context of disease can lead to detrimental immune cell activation. There has been recent interest in developing inflammation-related biomarkers to help diagnose NDDs and immune-targeted therapeutics.

scholarly journals Antibody Conjugation of Fluorescent Nanodiamonds for Targeted Innate Immune Cell Activation

2021 ◽  
Author(s):  
Lorena P. Suarez-Kelly ◽  
Steven H. Sun ◽  
Casey Ren ◽  
Isaac V. Rampersaud ◽  
David Albertson ◽  
...  
Keyword(s):  
Cell Activation ◽  
Immune Cell ◽  
Innate Immune ◽  
Innate Immune Cell ◽  
Immune Cell Activation ◽  
Antibody Conjugation ◽  
Fluorescent Nanodiamonds

scholarly journals Neuroimmune Semaphorin 4A in Cancer Angiogenesis and Inflammation: A Promoter or a Suppressor?

2018 ◽  
Vol 20 (1) ◽  
pp. 124 ◽  
Author(s):  
Apoorva Iyer ◽  
Svetlana Chapoval
Keyword(s):  
Cell Activation ◽  
Immune Cell ◽  
Fine Tuning ◽  
Breast Cancers ◽  
Immune Functions ◽  
Immune Cell Activation ◽  
Important Regulator ◽  
And Function ◽  
Axon Guidance Molecule ◽  
Guidance Molecule

Neuroimmune semaphorin 4A (Sema4A), a member of semaphorin family of transmembrane and secreted proteins, is an important regulator of neuronal and immune functions. In the nervous system, Sema4A primarily regulates the functional activity of neurons serving as an axon guidance molecule. In the immune system, Sema4A regulates immune cell activation and function, instructing a fine tuning of the immune response. Recent studies have shown a dysregulation of Sema4A expression in several types of cancer such as hepatocellular carcinoma, colorectal, and breast cancers. Cancers have been associated with abnormal angiogenesis. The function of Sema4A in angiogenesis and cancer is not defined. Recent studies have demonstrated Sema4A expression and function in endothelial cells. However, the results of these studies are controversial as they report either pro- or anti-angiogenic Sema4A effects depending on the experimental settings. In this mini-review, we discuss these findings as well as our data on Sema4A regulation of inflammation and angiogenesis, which both are important pathologic processes underlining tumorigenesis and tumor metastasis. Understanding the role of Sema4A in those processes may guide the development of improved therapeutic treatments for cancer.

scholarly journals Immunomodulation of Epithelium

1996 ◽  
Vol 10 (4) ◽  
pp. 243-248 ◽  
Author(s):  
Mary H Perdue
Keyword(s):  
Mast Cell ◽  
Immune Cells ◽  
Cell Activation ◽  
Immune Cell ◽  
Regulatory System ◽  
Mast Cell Activation ◽  
Immune Cell Activation ◽  
Inflammatory Conditions ◽  
Close Proximity ◽  
Antigenic Material

Many studies have provided evidence that the immune system is a key regulatory system of intestinal function. The interaction of immune cells with the gut epithelium plays an important role in host defence, acting to eliminate pathogens, antigens and other noxious material from the lumen of the gastrointestinal tract. During inflammatory conditions of the gut, the mucosa becomes packed with immune cells in close proximity to the enterocytes. Mediators released from these cells have profound effects on epithelial functions. The two main functions of the intestinal epithelium are to transport nutrients, ions and water, and to act as a barrier to prevent unimpeded uptake of antigenic material and microbes from the lumen. Both these functions are altered by immune reactions in response to various stimuli. Topics discussed include mast cells and epithelial function; mast cell-nerve interaction; mast cell activation; neutrophils, eosinophils and macrophages; T cells; and prostaglandins and immune cell activation.

Integrative immunophysiology in the intestinal mucosa

1994 ◽  
Vol 267 (2) ◽  
pp. G151-G165 ◽  
Author(s):  
M. H. Perdue ◽  
D. M. McKay
Keyword(s):  
Immune Cells ◽  
Cell Activation ◽  
Immune Cell ◽  
Intestinal Epithelial ◽  
Immune Cell Activation ◽  
Current State ◽  
Enteric Nerves ◽  
Host Defense Response ◽  
Acid Metabolites ◽  
Epithelial Physiology

Over the past ten years, it has become evident that intestinal epithelial functions such as ion secretion are a host defense response to the presence of antigens, microbes, and other noxious substances in the gut lumen. Such responses are mediated by the activation of immune cells in the mucosa causing release of chemical mediators that act directly or indirectly on the epithelium. Frequently, immune cell products stimulate enteric nerves resulting in amplification. Thus immune cells and nerves form interactive units that can recognize various stimuli both specifically and nonspecifically and initiate mechanisms to eliminate offending material. Here, we review the current state of knowledge regarding immune regulation of epithelial physiology with particular emphasis on the ability of immune cells and their products (biogenic amines, cytokines, arachidonic acid metabolites, oxidants) to alter electrolyte transport. The mast cell will be highlighted in this scheme as this cell has been, and continues to be, the focus of extensive research efforts. However, recently it has become apparent that cells such as lymphocytes, macrophages, and polymorphonuclear leukocytes also play important roles in immunophysiology. The effect of immune cell activation on epithelial functions other than transport, such as permeability, proliferation, and antigen presentation, will be described where appropriate. Finally, we will present evidence that the enterocyte can express an "activated" phenotype and thus participate directly in mucosal immune responses.

scholarly journals Functional and Therapeutic Relevance of Rho GTPases in Innate Immune Cell Migration and Function during Inflammation: An In Silico Perspective

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Pankaj Dipankar ◽  
Puneet Kumar ◽  
Shiba Prasad Dash ◽  
Pranita P. Sarangi
Keyword(s):  
Cell Migration ◽  
Immune Cells ◽  
Rho Gtpases ◽  
Inflammatory Cell ◽  
Immune Cell ◽  
Rho Gtpase ◽  
Innate Immune ◽  
Molecular Organization ◽  
Exchange Reactions ◽  
And Function

Systematic regulation of leukocyte migration to the site of infection is a vital step during immunological responses. Improper migration and localization of immune cells could be associated with disease pathology as seen in systemic inflammation. Rho GTPases act as molecular switches during inflammatory cell migration by cycling between Rho-GDP (inactive) to Rho-GTP (active) forms and play an essential role in the precise regulation of actin cytoskeletal dynamics as well as other immunological functions of leukocytes. Available reports suggest that the dysregulation of Rho GTPase signaling is associated with various inflammatory diseases ranging from mild to life-threatening conditions. Therefore, it is crucial to understand the step-by-step activation and inactivation of GTPases and the functioning of different Guanine Nucleotide Exchange Factors (GEFs) and GTPase-Activating Proteins (GAPs) that regulate the conversion of GDP to GTP and GTP to GDP exchange reactions, respectively. Here, we describe the molecular organization and activation of various domains of crucial elements associated with the activation of Rho GTPases using solved PDB structures. We will also present the latest evidence available on the relevance of Rho GTPases in the migration and function of innate immune cells during inflammation. This knowledge will help scientists design promising drug candidates against the Rho-GTPase-centric regulatory molecules regulating inflammatory cell migration.

scholarly journals Role of Macrophages and Microglia in Zebrafish Regeneration

2020 ◽  
Vol 21 (13) ◽  
pp. 4768 ◽  
Author(s):  
Susanna R. Var ◽  
Christine A. Byrd-Jacobs
Keyword(s):  
Nervous System ◽  
Immune Cells ◽  
Immune Cell ◽  
Innate Immune ◽  
Inflammatory Processes ◽  
The Central Nervous System ◽  
And Function ◽  
High Degree ◽  
Human Nerve

Currently, there is no treatment for recovery of human nerve function after damage to the central nervous system (CNS), and there are limited regenerative capabilities in the peripheral nervous system. Since fish are known for their regenerative abilities, understanding how these species modulate inflammatory processes following injury has potential translational importance for recovery from damage and disease. Many diseases and injuries involve the activation of innate immune cells to clear damaged cells. The resident immune cells of the CNS are microglia, the primary cells that respond to infection and injury, and their peripheral counterparts, macrophages. These cells serve as key modulators of development and plasticity and have been shown to be important in the repair and regeneration of structure and function after injury. Zebrafish are an emerging model for studying macrophages in regeneration after injury and microglia in neurodegenerative disorders such as Parkinson’s disease and Alzheimer’s disease. These fish possess a high degree of neuroanatomical, neurochemical, and emotional/social behavioral resemblance with humans, serving as an ideal simulator for many pathologies. This review explores literature on macrophage and microglial involvement in facilitating regeneration. Understanding innate immune cell behavior following damage may help to develop novel methods for treating toxic and chronic inflammatory processes that are seen in trauma and disease.

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