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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Mechanism and isotypes involved in passive immunoglobulin transfer to the newborn alpaca (Lama pacos).

Crias, newborn alpacas (Lama pacos), that were almost agammaglobulinemic at birth had a 70% increase in total serum proteins within 24 hours largely because of absorption of gamma globulins from colostrum. Immunoglobulin G was the isotype in highest concentration in colostrum and in serum from 24-hour-old crias. The serum IgG concentration of 10 crias increased linearly (r = 0.97) from a mean of 0.3 mg/ml (+/- 0.1 SD) for serum collected before crias suckled to a maximal mean of 30.1 mg/ml (+/- 8.1 SD) at 24 hours. The 24-hour concentration decreased by half in 10 days. Immunoglobulin M also was absorbed from colostrum and increased linearly (r = 0.99) from a mean of 0.5 mg/ml (+/- 0.1 SD) for serum collected before crias suckled to a maximal mean of 4.2 mg/ml (+/- 2.2 SD) 24 hours after birth. The 24-hour serum concentration of IgM decreased by half in 7 days. Therefore, on a weight basis, 7 times more IgG than IgM was transferred to crias; IgG accounted for greater than 85% of the passively transferred proteins in serum of 24-hour-old crias. Absorption of functional antibodies of IgG and IgM isotypes from colostrum of immunized dams by crias also was demonstrated. Immunoglobulin G and IgM antibody titers to chicken RBC increased linearly to maximal geometric mean titers of 1,139 and 843, respectively, 24 hours after birth. The 24-hour IgG and IgM antibody titers decreased by half in 6 and 3.8 days, respectively. Purified alpaca IgG had a molecular mass of 166 kilodaltons, a predominant gamma mobility, and an extinction coefficient of 14.1.(ABSTRACT TRUNCATED AT 250 WORDS)[1]

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