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Pinning Down A Cause Of Disease In A Model Of Psoriasis

Date:
June 9, 2008
Source:
Journal of Clinical Investigation
Summary:
Psoriasis is a chronic skin disease that affects approximately 2--3% of individuals in the Western world. New data have indicated that a subset of immune cells known as Tregs (which act to prevent other immune cells from responding inappropriately) are dysfunctional in a mouse model of psoriasis and that this dysfunction contributes substantially to the development of disease.

Psoriasis is a chronic skin disease that affects approximately 2--3% of individuals in the Western world. New data, generated by Karin Scharffetter-Kochanek and colleagues, at the University of Ulm, Germany, have indicated that a subset of immune cells known as Tregs (which act to prevent other immune cells from responding inappropriately) are dysfunctional in a mouse model of psoriasis and that this dysfunction contributes substantially to the development of disease.

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Mice that express a reduced amount of the protein CD18 (Cd18hypo mice) develop a skin disease that resembles the symptoms of individuals with psoriasis. In the study, Tregs isolated from Cd18hypo mice failed to suppress the proliferation of disease-causing immune cells because they secreted lower levels of the soluble factor TGF-beta than normal Tregs.

This was also important for their inability to control disease in vivo, as transplantation of normal Tregs into Cd18hypo mice resulted in a substantial improvement in the psoriasis-like disease, whereas if these cells were transplanted in the presence of antibodies that neutralized TGF-beta there was no improvement in disease.

The authors therefore conclude that psoriasis-like disease in Cd18hypo mice is caused mainly by a defect in Treg function and suggest that maintaining CD18 levels is important for ensuring that Tregs function optimally.


Story Source:

The above story is based on materials provided by Journal of Clinical Investigation. Note: Materials may be edited for content and length.


Journal Reference:

  1. Karin Scharffetter-Kochanek et al. TGF-beta--dependent suppressive function of Tregs requires wild-type levels of CD18 in a mouse model of psoriasis. Journal of Clinical Investigation, June 2, 2008

Cite This Page:

Journal of Clinical Investigation. "Pinning Down A Cause Of Disease In A Model Of Psoriasis." ScienceDaily. ScienceDaily, 9 June 2008. <www.sciencedaily.com/releases/2008/06/080602214201.htm>.
Journal of Clinical Investigation. (2008, June 9). Pinning Down A Cause Of Disease In A Model Of Psoriasis. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2008/06/080602214201.htm
Journal of Clinical Investigation. "Pinning Down A Cause Of Disease In A Model Of Psoriasis." ScienceDaily. www.sciencedaily.com/releases/2008/06/080602214201.htm (accessed October 25, 2014).

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