Although it is commonly imagined that hematopoiesis takes place in a liquid environment resembling the blood, with progenitors responding mainly to soluble hormone-like cytokines, this is in fact not the case at all. It is much more accurate to think of the bone marrow as a solid tissue in which different types of hematopoietic cells develop in physically different locations. These microenvironments are visible in histologic sections of bone marrow, which reveal a patchwork of microscopic foci, each devoted to the production of a particular cell type (Figure bellow). The bone marrow microenvironment is set up and maintained by bone marrow stromal cells. Within each microenvironment, contact of cells with one another or with proteins and other substances that make up the extracellular matrix (ECM) greatly facilitates cell division and differentiation. (more…)
Our understanding of hematopoiesis has advanced greatly in recent years with the isolation and characterization of hematopoietic st ...
The process by which blood cells grow, divide, and differentiate in the bone marrow is called hematopoiesis. Three general cl ...
The Ras-dependent pathway can be triggered by a variety of cytokine receptors, as well as by certain adhesion molecules and by ...
Neutrophils make up an army of more-or-less identical circulating phagocytes that are poised to respond quickly and in vast numbers ...
Cells participating in the cellular immune response are organized into discrete associated lymphoid tissues and organs which are ...
Exotoxins are secreted products, usually of bacteria but sometimes protozoa and fungi. They can act in a number of ways:
• Inhibition of protein synthesis. Corynebacterium diphtheriae, the cause of diphtheria, produces a toxin that causes ADP-ribosylation elongation factor-2, thereby stopping protein synthesis. It is extremely potent and one molecule of toxin is capable of killing a cell. Escherichia coli, Vibrio cholerae and Bordatella pertussis (the cause of whooping cough) also produce toxins that cause ADP-ribosylation of proteins. (more…)
The final stage of the disease process (although it may not be the final stage of the infection) is the actual production of di ...
Exotoxins are noxious proteins secreted by many bacteria. These toxins are often heat-labile and thus can be heat-inactivated f ...
One especially favored target for immune recognition is bacterial lipopolysaccharide (LPS). This macromolecule is found only in ...
Bacteria cause allergic disease because of toxicity, invasiveness, immunopathology, or lends of these three mechanisms. Thus much ...
A few of the best known humoral effectors of innate immunity are listed in Table 1 bellow, along with the types of target molec ...
Asthma is characterized by Th2-dominant cytokine profiles. The risk of developing asthma is lower in children attending day care in the first year of life. Therefore, this study was conducted to assess the interaction between day-care attendance, T-cell cytokine profiles and atopic phenotypes in early childhood. Children (n = 208) in the Childhood Onset of Asthma (COAST) study were genotyped for 72 polymorphisms in 45 immune response genes. The COAST cohort was selected on the basis of a high risk of asthma. Measurements of IFN-y (Th1), IL-5 and IL-13 (Th2), and IL-10 (Treg) were made at birth and at age 1 year and the children were stratified by day-care attendance. Wheeze and atopic dermatitis phenotypes were documented in the first year. (more…)
CD14 is part of the receptor complex for endotoxin, which is a component of tobacco smoke. The CD14 gene is located on chromoso ...
The genetics of asthma will be discussed only in the context of environmental exposures. In general, the identification of nove ...
This study sought to determine the influence of passive exposure to tobacco smoke during childhood on the results of genetic linkag ...
A general pattern of factors influencing development of asthma seems to be emerging, including family allergy history/ asthma g ...
The T-bet (T-box 21) gene (TBX21) encodes a transcription factor, T-box expressed in T cells, which has been implicated in asthma t ...
Regular use of ß-agonists has been known to lead to tolerance to their bronchodilator effects. It is not known how quickly tolerance develops or how long it lasts after stopping ß-agonist therapy.
Bronchodilator tolerance occurs after even a single dose and reaches a maximum after 1 week of regular formoterol. Sensitivity recovers 3 days after stopping treatment. (more…)
This study evaluated budesonide formoterol efficacy and safety of a novel asthma management strategy for both maintenance and s ...
Two long-acting ß 2 -adrenergic agonists (LABAs), salmeterol and formoterol, have been demonstrated to be safe and effective ag ...
Asthma control is improved by combining inhaled corticosteroids with long acting beta-agonists but patients still require relie ...
This study was similar to the study of Harrison and colleagues, which looked at doubling the dose of inhaled corticosteroid dur ...
Current internationally recognized guidelines indicate that symptomatic asthmatics using a low to medium inhaled corticosteroid ...
Acetylcholine is a neurotransmitter of the nerve vagus, the functional effects mediated by binding to muscarinic receptors. Results from stimulation of acetylcholine on the contraction of myoepithelial cells around bronchial submucosal glands and thus to acetylcholine airway obstruction may bronchial provocation tests in the measurement of bronchial hyperresponsiveness may be used with others. (more…)
Toll-like receptors (TLRs) act as receptors for numerous stimuli of immune cells, including bacterial cell wall constituents (l ...
The way in which pathogens spread through the body is influenced to some extent by whether they live intra-cellularly, extra-ce ...
Adenosine is a nucleoside and consists of adenine in glycosidic linkage with ribose. Most adenosine is derived from cleavage of ade ...
The response to injury usually begins with dilatation of small blood vessels in and around the injured site (figure bellow). Th ...
The cysteinyl leukotrienes (LTC 4 , LTD 4 and LTE 4 ) are lipid mediators produced from an arachidonic acid precursor following ...
There are still many people that are giving consultation to others, suggest the wrong advice in the context of the treatment of baby eczema. Please take note that many of this well-intentioned advice may be more confusion rather than give help to parents. But from time to time, we need to know what you should do when treating baby eczema. (more…)
Children in the early of their life is prone to allergy because their body immune system is not developed completely. As a matter o ...
Hay fever affects millions of people around the world every year. And one of the most common and prolific triggers is grass pol ...
Allergic reactions is natural body’s response to “foreign substance” or “invader” that potentially harmful to your body. Once ...
Many people are under impression that allergy and asthma disease had genetic or heredity factors playing major role as medium o ...
Scleroderma is a disease related with body autoimmune, connective tissue disease. Scleroderma induces inflammation and thickeni ...
B cells
The main function of B cells is to produce antibodies. Antibodies are complex molecules produced by the immune system in response to antigens. As mentioned previously, antigens are foreign proteins or glycoproteins (a sugar linked to a protein) that trigger the immune response. Every living cell produces several different proteins, each unique to its own cell type and species. The antibody produced against the antigen is entirely specific to that antigen. (more…)
Antibodies which are also known as immunoglobulin are found in our blood and other bodily fluids. Antibodies are used as a mechan ...
It is common to find anti-food IgG antibodies circulating in blood, even in people who have no signs or history of adverse reac ...
Our current knowledge for trigger factor and food allergy intolerance is still in it infancy level. We already known that the aller ...
Exotoxins are noxious proteins secreted by many bacteria. These toxins are often heat-labile and thus can be heat-inactivated f ...
Immune system is your body’s defense mechanism to protect from infectious organism and other living object invaded your body. T ...
Allergens are the trigger for human body allergic reaction. It is one of human immunological process to react for invader substance. We find most allergens are common in our environment. Most allergic reactions developed over the years by the immune system. If someone who has suffered from allergies for a long time, they mostly will know when their body gives immediate reaction to an allergen. (more…)
Allergies can be defined as inappropriate immune system reactions to a foreign substance entering body. Allergies are kind of disea ...
B cells The main function of B cells is to produce antibodies. Antibodies are complex molecules produced by the immune syste ...
Each year, millions of people are susceptible to seasonal allergies symptoms. The pollen of the flowers float in the air that could ...
Almost any kind of conditions sure enough get benefit from BICOM Bioresonance therapy. Bioresonance Treatment is non-invasive, ...
Allergic Reactions For daily life, of course we need our immune system. Without having immune system, we could not survive ...
Innate immunity depends on both resident and recruited leukocytes. The macrophage without doubt plays an import- ant role in the detection of pulmonary infections. Low inocula of pneumococci are cleared by macrophages. Alveolar macrophages also have an important role in the initiation of responses to inhaled lipopolysaccharide (LPS) and their function (more…)
Innate immune responses are seen in a very broad range of tissues. Indeed, the Toll-like receptors (TLRs, one of the most important ...
Contact of pathogens with the innate immune system will most frequently occur at epithelia, and the biology of the airway epitheliu ...
While our primary concern is the impact that the innate immune system has on allergic disease, it is essential to recognize that al ...
Activation of the innate immune system is an integral part of the pathology of allergic diseases such as asthma, with a dual role t ...
Toll-like receptors (TLRs) act as receptors for numerous stimuli of immune cells, including bacterial cell wall constituents (l ...
While our primary concern is the impact that the innate immune system has on allergic disease, it is essential to recognize that allergic disease also impacts on the function- ing of the innate immune system. In part this is through treatment, since immunosuppressive therapies inevitably contribute to impairment of immunity at the levels of the innate and adaptive systems. (more…)
Innate immune responses are seen in a very broad range of tissues. Indeed, the Toll-like receptors (TLRs, one of the most important ...
Innate immunity depends on both resident and recruited leukocytes. The macrophage without doubt plays an import- ant role in the de ...
Contact of pathogens with the innate immune system will most frequently occur at epithelia, and the biology of the airway epitheliu ...
Activation of the innate immune system is an integral part of the pathology of allergic diseases such as asthma, with a dual role t ...
Exacerbations of asthma are frequently associated with rhinoviral infection. Rhinoviruses infect respiratory epithelial cells, ...