Experiments were done to investigate mechanisms of appearance of both 7 S and 11 S IgA in nasal secretions. Three IgA preparations, (a) 11 S IgA from nasal secretions, (b) 7 S IgA from homologous serum, and (c) 7 S IgA from autologous serum, were isolated, labeled, and injected intravenously into volunteers. The rate of disappearance from plasma and the extent and nature of their appearance in ...

BACKGROUND IgA deficiency causes false-negative IgA-based celiac serology results in patients with celiac disease. Using a case-finding strategy, we examined the prevalence of IgA deficiency, physician evaluation, and management of IgA deficiency during serological testing for celiac disease. METHODS We reviewed consecutive IgA-endomysial antibody (EMA) and serum IgA results from the laborato...

To characterize the physiology of circulating IgA immune complexes (IgA-IC), the dynamics of IgA-IC removal by the liver were examined. After intravenous injection, covalently cross-linked IgA antibodies to the dinitrophenyl determinant were rapidly removed from the circulation by the liver. Immunofluorescence microscopy and light and electron microscope autoradiography showed that the IgA-IC w...

More than 85% of the immunoglobulin A (IgA) antibodies in normal adult serum are monomeric (m-IgA). By contrast, virus-specific IgA is mainly polymeric (p-IgA) in sera from patients with rubella, measles, and varicella. Specific m-IgA antibodies only reach quantitative significance in late convalescence. In patients with herpes zoster, on the other hand, a varying response was observed: in thre...

Immunoglobulin A (IgA) activity has been associated with reduced growth and fecundity of Teladorsagia circumcincta. IgA is active at the site of infection in the abomasal mucus. However, while IgA activity in abomasal mucus is not easily measured in live animals without invasive methods, IgA activity can be readily detected in the plasma, making it a potentially valuable tool in diagnosis and c...

Key words: FcaR; FcR c chain; IgA nephropathy; mesangial cells; physical association Background. Most intensive investigations on the pathogenesis of IgA nephropathy have focused on the process before IgA deposition and the characteristics of IgA/IgA immune complex (IgA IC), but it still Introduction remains uncertain whether mesangial IgA ICs may cause glomerular injuries directly or are only ...

Some commensal intestinal bacteria in humans and mice are coated with secretory immunoglobulin A (S-IgA). It has been suggested that the S-IgA coating of commensal bacteria does not occur at random and thus identification of S-IgA-coated bacterial genera/species should help in elucidating the interaction between S-IgA and commensal intestinal bacteria, but no method of identifying the genera/sp...

Background: IgA nephropathy, a prevalent disease in Asia, is considered the main cause of end stage renal disease among primary glomerular disease. Objective: To determine the frequency of different clinical, histopathological and immunofluorescent characteristics of IgA nephropathy. Methods: Renal biopsies of 376 patients were received for immunofluorescent and for histopathological studies. B...

Background: Acute lymphoblastic leukemia (ALL) is the most common type of leukemia among children. Immunoglobulin A is the most numerous immunoglobulin isotype in mucosal secretion.  Immunoglobulin A (IgA) deficiency can increase risk of cancer in patients. Since few studies have been done on relation between serum IgA and ALL, this study was attempted to evaluate serum IgA in ALL patients...