Recent reports on Hashimoto's thyroiditis (HT) with increased numbers of IgG4-positive plasma cells suggest that this type of HT may have a close relationship to IgG4-related disease (IgG4-RD). This unique subgroup of HT is termed as IgG4 thyroiditis and reveals distinct clinical, serological, and sonographic features from the non-IgG4 thyroiditis group. On the basis of immunostaining for IgG...

the manipulation of redox potential in secretory pathway by thiol reducing agents can be a strategy to improve the production levels of disulfide-bonded proteins including recombinant antibodies. here we have studied the influence of cysteamine on viability and the production level of igg4 in sp2.0 cells. for this purpose, the recombinant sp2.0 cells producing an anti cd33 igg4, were subjected ...

IgG4 reactions marked by infiltration of IgG4-positive plasma cells in affected organs occur in cancer patients and in patients with IgG4-related diseases. Extrahepatic cholangiocarcinomas including gall bladder cancer are often accompanied by significant IgG4 reactions; these reactions show a negative correlation with CD8-positive cytotoxic T cells, suggesting that the evasion of immune survei...

BACKGROUND AND AIM Serum IgG4 concentrations are commonly measured in clinical practice. The aim of this study was to investigate serum IgG4 concentrations in adults and their potential relationship with demographic, lifestyle, metabolic, and allergy-related factors. METHODS Serum IgG4 concentrations were measured with a commercial assay in 413 individuals (median age 55 years, 45% males) who...

IgG4-related disease is a unique systemic inflammatory condition characterized by pseudotumorous formation or swelling of affected organs and high-serum IgG4 concentrations. Further studies have demonstrated that IgG4-related disease can involve a variety of organs including the pancreas ( type 1 autoimmune pancreatitis) , bile duct ( IgG4-related sclerosing cholangitis), liver (IgG4-related he...

AIMS To report the clinicopathological characteristics of patients with ocular adnexal marginal zone B cell lymphoma (MZBL) with IgG4-positive plasma cells. METHODS 114 biopsy samples of ocular adnexal MZBLs were analysed. MZBLs with IgG4-positive plasma cells were included when the IgG4:IgG ratio was >40% (IgG4-related group). The serum levels of each subclass of immunoglobulins and soluble ...

IgG4-related disease (IgG4-RD) is a systemic inflammatory characterized by elevated levels of serum IgG4 and infiltration IgG4-positive plasma cells tissue fibrosis. Some patients with IgG4-RD exhibit skin lesions, this was defined as (IgG4-RSD). Here, we report case IgG4-RSD plaques on the lower legs. A 69-year-old man referred to our hospital 10-year history nonpruritic brown Skin examination...

PURPOSE OF REVIEW Recent descriptions of the group of clinical disorders collectively defined as IgG4-related systemic disease (IgG4-RSD) have prompted this review of the unique biology of the IgG4 antibody. This article will discuss IgG4 structure and function, the unique phenomenon of half-antibody exchange, and the implications of IgG4 biology for its proposed role in immunologic diseases. ...

Immonoglobulin G4‑related ophthalmic disease (IgG4‑ROD) is a IgG4‑RD and exhibits two main characteristics: Fibrosis that is not necessarily marked histopathologically; and frequent formation of germinal centers (GCs). Follicular B helper T (Tfh) cells are now recognized as the true helper cells for B cells in antibody responses. In the present study, the profile and distribution of Tfh cells i...

Objective. Immunoglobulin-G4-(IgG4-) related disease (IgG4 RD) is a fibrosing process characterized by a significant infiltration of IgG4-secreting plasma cells. IgG4 RD can affect almost all organs including salivary glands. Whether IgG4 RD plays a role in the development of sicca syndrome and particularly dry mouth syndrome remains to be investigated. Methods. We conducted a monocentric cohor...