Related topics: cells , immune system , t cells , autoimmune diseases , immune response
White blood cell
hideWhite blood cells (WBCs), or leukocytes (also spelled "leucocytes"), are cells of the immune system defending the body against both infectious disease and foreign materials. Five different and diverse types of leukocytes exist, but they are all produced and derived from a multipotent cell in the bone marrow known as a hematopoietic stem cell. Leukocytes are found throughout the body, including the blood and lymphatic system.
The number of leukocytes in the blood is often an indicator of disease. There are normally between 4×109 and 1.1×1010 white blood cells in a litre of blood, making up approximately 1% of blood in a healthy adult. An increase in the number of leukocytes over the upper limits is called leukocytosis, and in leukopenia, this number is much lower than the lower limit. The physical properties of leukocytes, such as volume, conductivity, and granularity, may change due to activation, the presence of immature cells, or the presence of malignant leukocytes in leukemia.
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News tagged with immune cells
What is the function of the protein CD20?
13 hours ago |
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Antibodies directed against the protein CD20, which is expressed by immune cells known as B cells, are used to treat B cell non-Hodgkin lymphoma and rheumatoid arthritis. Despite this, the function of CD20 has not been determined. ...
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Novel nanotechnology heals abscesses caused by resistant staph bacteria
Nanotechnology / Bio & Medicine
1hour ago |
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Researchers at the Albert Einstein College of Medicine of Yeshiva University have developed a new approach for treating and healing skin abscesses caused by bacteria resistant to most antibiotics. The study ...
Mystery solved: Scientists now know how smallpox kills
5 hours ago |
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A team of researchers working in a high containment laboratory at the Centers for Disease Control and Prevention in Atlanta, GA, have solved a fundamental mystery about smallpox that has puzzled scientists long after the ...
Enzyme necessary for development of healthy immune system
6 hours ago |
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Mice without the deoxycytidine kinase (dCK) enzyme have defects in their adaptive immune system, producing very low levels of both T and B lymphocytes, the major players involved in immune response, according to a study by ...
Study redefines placebo effect as part of effective treatment
Medicine & Health / Psychology & Psychiatry
7 hours ago |
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Researchers used the placebo effect to successfully treat psoriasis patients with one quarter to one half of their usual dose of a widely used steroid medication, according to an early study published online today in the ...
Study shows immune system protein involved in reprogramming adult cells to express stem cell genes
13 hours ago |
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(PhysOrg.com) -- Scientists have discovered a protein required to quickly and efficiently reprogram human skin cells to express embryonic stem cell genes.
Gene therapy makes mice breath easier
Dec 21, 2009 |
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Researchers from Boston University School of Medicine (BUSM) have discovered a new gene therapy that may prevent the progression of emphysema. The study, which appears on-line in the Journal of Clinical Investigation, descri ...
Naturally occurring lipid blocks RSV infection in lungs
Dec 21, 2009 |
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Researchers at National Jewish Health have discovered that a naturally occurring lipid in the lung can prevent RSV infection and inhibit spread of the virus after an infection is established. RSV is the major cause of hospitalization ...
Drug for Multiple Myeloma Demonstrated to Significantly Extend Disease-Free Survival
Dec 21, 2009 |
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(PhysOrg.com) -- Initial results from a large, randomized clinical trial for patients with multiple myeloma, a cancer of the blood and bone marrow, showed that patients who received the oral drug lenalidomide (Revlimid, also ...
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