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
Sweet -- sugared polymer a new weapon against allergies and asthma
Nov 19, 2009 |
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Scientists at Johns Hopkins and their colleagues have developed sugar-coated polymer strands that selectively kill off cells involved in triggering aggressive allergy and asthma attacks. Their advance is a significant step ...
New findings suggest strategy to help generate HIV-neutralizing antibodies
Medicine & Health / HIV & AIDS
Nov 19, 2009 |
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New discoveries about anti-HIV antibodies may bring researchers a step closer to creating an effective HIV vaccine, according to a new paper co-authored by scientists at the Vaccine Research Center of the National Institute ...
Cross-country runabouts -- immune cells on the move
Nov 17, 2009 |
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(PhysOrg.com) -- In order to effectively fight pathogens, even at remote areas of the human body, immune cells have to move quickly and in a flexible manner.
HIV vaccine failure probably caused by virus used, says new research
Medicine & Health / HIV & AIDS
Nov 16, 2009 |
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The recent failure of an HIV vaccine was probably caused by the immune system reacting to the virus 'shell' used to transmit the therapy around the body, according to research published today in the Proceedings of the Na ...
Scientists guide immune cells with light and microparticles (w/ Video)
Nov 16, 2009 |
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A team led by Yale University scientists has developed a new approach to studying how immune cells chase down bacteria in our bodies. Their findings are described in the November 15 issue of Nature Methods Advanc ...
Interstitial macrophages: immune cells that prevent asthma
Nov 10, 2009 |
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The continual presence in the air of the microbe-derived molecule LPS promotes asthma in some individuals. What prevents inhalation of LPS from promoting asthma in most individuals is not well understood. However, researchers ...
Crossing the line: how aggressive cells invade the brain (w/ Video)
Nov 05, 2009 |
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In diseases such as multiple sclerosis, cells of the immune system infiltrate the brain tissue, where they cause immense damage. For many years, it was an enigma as to how these cells can escape from the bloodstream. ...
Key player identified in cascade that leads to hypertension-related kidney damage
Nov 05, 2009 |
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A key player in a cascade that likely begins with stress and leads to high blood pressure and kidney damage has been identified by researchers who say the finding may lead to better ways to control both.
Researchers have immune cells running in circles
Nov 02, 2009 |
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(PhysOrg.com) -- University of Illinois at Chicago College of Medicine researchers have identified the important role a protein plays in the body's first line of defense in directing immune cells called neutrophils toward ...
Some health products paring back on claims they boost the immune system
Oct 30, 2009 |
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Airborne, the popular dietary supplement created by a germ-averse schoolteacher, no longer boasts that it can prevent your cold or ease the aggravating symptoms. Instead, the packaging says the effervescent pill helps "support ...
Genetic links to fungal infection risk identified
Oct 28, 2009 |
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(PhysOrg.com) -- Two genetic mutations that may put individuals at increased risk of fungal infections have been identified by scientists from UCL and Radboud University, increasing understanding about the genetic basis of ...
Fibre may keep asthma, diabetes at bay, study finds
Oct 28, 2009 |
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Insoluble dietary fibre, or roughage, not only keeps you regular, say Australian scientists, it also plays a vital role in the immune system, keeping certain diseases at bay.
Study shows how carbon nanotubes can affect lining of the lungs
Nanotechnology / Bio & Medicine
Oct 25, 2009 |
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(PhysOrg.com) -- Carbon nanotubes are being considered for use in everything from sports equipment to medical applications, but a great deal remains unknown about whether these materials cause respiratory ...
Manipulating brain inflammation may help clear brain of amyloid plaques
Medicine & Health / Neuroscience
Oct 22, 2009 |
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In a surprising reversal of long-standing scientific belief, researchers at the Mayo Clinic campus in Florida have discovered that inflammation in the brain is not the trigger that leads to buildup of amyloid deposits and ...
Research shows treating HIV-AIDS with interleukin-2 is ineffective
Medicine & Health / HIV & AIDS
Oct 15, 2009 |
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An international research team has demonstrated that treating HIV-AIDS with interleukin-2 (IL-2) is ineffective. As a result, the researchers recommend that clinical trials on this compound be stopped. Their finding was published ...
