Related topics: cells , immune system
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
Discovery of new gene called Brd2 that regulates obesity and diabetes
21 hours ago |
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The chance discovery of a genetic mutation that makes mice enormously fat but protects them from diabetes has given researchers at Boston University School of Medicine, USA, new insights into the cellular mechanisms that ...
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Researchers work on vaccine to improve immune system in newborns
21 hours ago |
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As soon as babies are born, they are susceptible to diseases and infections, such as jaundice and e-coli. For up to a month, their immune systems aren't adequately developed to fight diseases. Although these infections are ...
Biological catch-22 prevents induction of antibodies that block HIV
Medicine & Health / HIV & AIDS
21 hours ago |
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Scientists seeking to understand how to make an AIDS vaccine have found the cause of a major roadblock. It turns out that the immune system can indeed produce cells with the potential to manufacture powerful HIV-blocking ...
New insight into selective binding properties of infectious HIV
Medicine & Health / HIV & AIDS
22 hours ago |
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Free infectious HIV-1 is widely thought to be the major form of the virus in the blood of infected persons. U.S. Military HIV Research Program (MHRP) researchers, however, have demonstrated that essentially all of the infectious ...
Immune cell activity linked to worsening COPD
20 hours ago |
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A new study links chronic obstructive pulmonary disease, or COPD, with increased activity of cells that act as sentinels to activate the body's immune system.
Foodborne Staph Toxin Pinpointed by New Assay
18 hours ago |
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(PhysOrg.com) -- Most people need about two days to recover from being sickened by foods contaminated with what's known as staphylococcal enterotoxin A, or "SEA." Produced by Staphylococcus aureus bacteria, ...
Cold war - Fighting the threat of latent TB (w/ Podcast)
16 hours ago |
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(PhysOrg.com) -- Scientists are making breakthroughs in studying the latent form of Mycobacterium tuberculosis. This work could revolutionise the treatment of TB.
First immunological clue to why some H1N1 patients get very ill or die
21 hours ago |
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An international team of Canadian and Spanish scientists have found the first potential immunological clue of why some people develop severe pneumonia when infected by the pandemic H1N1 virus.
Patients meet donors from largest-ever kidney swap
3 hours ago |
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(AP) -- Thirteen patients with healthy new kidneys from what's believed to be the world's largest kidney exchange met the donors who made it happen Tuesday - including three who are sure to face the question, ...
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