News tagged with hemoglobin

Related topics: diabetes · red blood cells

Study suggests new approach to fight lung cancer

Recent research has shown that cancer cells have a much different – and more complex – metabolism than normal cells. Now, scientists at The University of Texas at Dallas have found that exploiting these differences might ...

Jun 18, 2013
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Lixisenatide non-inferior to exenatide for diabetes

(HealthDay)—In adults with type 2 diabetes not adequately controlled with metformin, lixisenatide once daily offers diabetes control similar to that of exenatide twice daily, with some added benefits, according to a study ...

Jun 07, 2013
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The protein profile of restless leg syndrome

A protein profile of people with restless leg syndrome (RLS), identifies factors behind disrupted sleep, cardiovascular dysfunction and pain finds research in BioMed Central's open access journal Fluids and Barriers of the ...

Jun 06, 2013
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FDA approves A1c test for diabetes diagnosis

(HealthDay)—The U.S. Food and Drug Administration has just cleared a hemoglobin A1c assay to be marketed for the diagnosis of diabetes, according to a May 24 press release issued by the agency.

May 29, 2013
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Hemoglobin

Hemoglobin (English pronunciation: /hiːməˈɡloʊbɪn/; also rendered as haemoglobin and abbreviated Hb or Hgb) is the iron-containing oxygen-transport metalloprotein in the red blood cells of all vertebrates, with the exception of the fish family Channichthyidae, as well as the tissues of some invertebrates. Hemoglobin in the blood carries oxygen from the respiratory organs (lungs or gills) to the rest of the body (i.e., the tissues) where it releases the oxygen to burn nutrients to provide energy to power the functions of the organism, and collects the resultant carbon dioxide to bring it back to the respiratory organs to be dispensed from the organism.

In mammals, the protein makes up about 97% of the red blood cells' dry content, and around 35% of the total content (including water).[citation needed] Hemoglobin has an oxygen binding capacity of 1.34 ml O2 per gram of hemoglobin, which increases the total blood oxygen capacity seventy-fold compared to dissolved oxygen in blood. The mammalian hemoglobin molecule can bind (carry) up to four oxygen molecules.

Hemoglobin is involved in the transport of other gases: it carries some of the body's respiratory carbon dioxide (about 10% of the total) as carbaminohemoglobin, in which CO2 is bound to the globin protein. The molecule also carries the important regulatory molecule nitric oxide bound to a globin protein thiol group, releasing it at the same time as oxygen.

Hemoglobin is also found outside red blood cells and their progenitor lines. Other cells that contain hemoglobin include the A9 dopaminergic neurons in the substantia nigra, macrophages, alveolar cells, and mesangial cells in the kidney. In these tissues, hemoglobin has a non-oxygen-carrying function as an antioxidant and a regulator of iron metabolism.

Hemoglobin and hemoglobin-like molecules are also found in many invertebrates, fungi, and plants. In these organisms, hemoglobins may carry oxygen, or they may act to transport and regulate other things such as carbon dioxide, nitric oxide, hydrogen sulfide and sulfide. A variant of the molecule, called leghemoglobin, is used to scavenge oxygen, to keep it from poisoning anaerobic systems, such as nitrogen-fixing nodules of leguminous plants.

This text uses material from Wikipedia, licensed under CC BY-SA

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