2013 Fiscal Year Final Research Report
IgG subclass analysis and IgG4 depletion therapy for pemphigus
| Project/Area Number |
24791175
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Dermatology
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| Research Institution | Keio University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 天疱瘡 / IgG4 / 治療 |
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| Research Abstract |
Pemphigus is an autoimmune blistering disease caused by circulating antibodies against desmogleins (Dsg) which are cell-cell adhesion protein in the epidermis. We recently established anti-Dsg IgG subclass ELISA method and we showed that Dsg-specific autoantibodies are enriched in IgG4. Addition to that total serum IgG4 was enriched in patients with pemphigus. Furthermore, IgG4 depletion of pemphigus sera reduced pathogenicity in a keratinocyte dissociation assay. The median serum concentration of Dsg-specific IgG4 was significantly higher in pemphigus patients during active disease compared to patients in remission(p=0.04). Memory B cell populations were enriched for surface-IgG4 positive cells in pemphigus compared to unaffected individuals.
IgG4 could be depleted by immunoadsorption or by selective depletion of surface-IgG4 memory B cells, and which we have shown can be bound and hence potentially targeted based on surface IgG4 expression.
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