Difference between revisions of "Immunoglobulin D"
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[[Image:LH IgD.png|thumb|250px|right|'''IgD''']] | [[Image:LH IgD.png|thumb|250px|right|'''IgD''']] | ||
[[Image:IgD.jpg|thumb|right|250px|IgD - B. Catchpole, RVC 2008]] | [[Image:IgD.jpg|thumb|right|250px|IgD - B. Catchpole, RVC 2008]] | ||
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''Shortened to IgD''. | ''Shortened to IgD''. | ||
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{{Jim Bee 2007}} | {{Jim Bee 2007}} | ||
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[[Category:Immunoglobulins]] | [[Category:Immunoglobulins]] | ||
[[Category:A&P Done]] | [[Category:A&P Done]] | ||
Latest revision as of 16:06, 2 July 2012
Overview
Shortened to IgD.
IgD is present in ruminants, pigs, dogs and rodents but has not been identified in horses, cats, rabbits and chickens. It is mainly expressed on the surface of B-cells i.e. it is never secreted.
Structure
IgD is Y-shaped. In rodents, it has two δ heavy chain constant regions, whereas other mammals have three. IgD has a long hinge region and no disulfide bonds.
Function
IgD is only expressed in association with IgM. It is thought to be important in B-cell development, although it has been shown in δ chain knockout mice (so they have no functional IgD) do not have any noticeable defects in immune function.
Interestingly IgD serum levels increase in allergic reactions, although it is not known why this is.
Links
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Originally funded by the RVC Jim Bee Award 2007 |
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