This study investigated the effect of natural priming and age on serum IgG and IgA subclass responses after parenteral trivalent influenza vaccination. Sera from 18 young children and 8 adults were collected at various times after vaccination. An ELISA was performed to quantify the concentrations of antibody subclasses. The children were divided into primed and unprimed groups based on the pres...

Metabolic properties of the four subclasses of human IgG were investigated by performing 47 turnover studies in individuals with normal IgG serum concentrations, as well as in patients with an increased level of one of the subclasses. Studies in 12 subjects with normal IgG serum concentration showed that the average biologic half-life of G(1), G(2), and G(4) was 21 days, while that of G(3) was ...

To characterize serum IgG subclass levels in several autoimmune diseases, including primary Sjogren syndrome (pSS), systemic sclerosis (SSc), systemic lupus erythematosus (SLE), and primary biliary cirrhosis (PBC). We aimed to analyze serum IgG subclass distribution and to test whether serum IgG4 levels are elevated in these diseases. Serum IgG subclass levels from 102 pSS, 102 SSc, 100 SLE, an...

BACKGROUND A previous study from this laboratory showed that Galpha12 members participate in the production of inflammatory cytokines. In spite of the identification of B cell homeostasis responses regulated by Galpha13, the functional roles of Galpha12 members in the production of immunoglobulin (Ig) isotypes remained unknown. This study investigated whether Galpha12 members are involved in th...

In normal adults, IgG constitutes approximately 75% of the total serum immunoglobulins. Within the IgG class, the usual order of concentration of the 4 subclasses is IgG1> IgG2> IgG3> IgG4, but the actual concentration of each may vary markedly between individuals. The four IgG subclasses show considerable differences in their properties, including ability to fix complement, to bind to macropha...

Heavy chains of IgG, IgA, and IgM classes of human immunoglobulins were compared by N-terminal residue determination and partial amino acid sequence analysis. A third subclass of the variable region of heavy chains was observed; an unblocked glutamic acid as the N-terminal residue is characteristic of this subclass. Our results indicated that the heavy chain variable region subclasses are not c...

The gamma heavy-chain subclass of bound antiplatelet antibody was examined in six patients with autoimmune thrombocytopenic purpura (ATP) by a solid-phase radioimmunoassay. Monospecific antisera for ‘yGl , yG2, ‘yG3. and ‘yG4 subclasses were employed in a “sandwich” technique, utilizing the binding of 125l-staphylococcal protein A. We have previously reported that serum antiplatelet antibody wa...

Fresh frozen plasma and intravenous immunoglobulin are used as prophylaxis against, and for the treatment of, neonatal infection. It is assumed that any beneficial effect is mediated through the humoral immune factors contained in each preparation. The effect of fresh frozen plasma and intravenous immunoglobulin on humoral immune markers (immunoglobulins and IgG subclasses, complement component...

Aptamers that recognize the IgG Fc region are of great interest because of their wide application as an immunology probing tool, for diagnostics, and as affinity agents for antibody purification. We developed a target replacement strategy as a modification of conventional Systematic Evolution of Ligands by EXponential enrichment (SELEX) in order to efficiently select and identify novel DNA apta...