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  • Title: Humoral and mucosal IgA antibody response to a recombinant 52-kDa cysteine-rich portion of the Entamoeba histolytica galactose-inhibitable lectin correlates with detection of native 170-kDa lectin antigen in serum of patients with amebic colitis.
    Author: Abou-el-Magd I, Soong CJ, el-Hawey AM, Ravdin JI.
    Journal: J Infect Dis; 1996 Jul; 174(1):157-62. PubMed ID: 8655985.
    Abstract:
    Humoral and mucosal IgA responses to a recombinant cysteine-rich portion (designated LC3) of the Entamoeba histolytica galactose-inhibitable lectin's 170-kDa subunit were determined in patients with amebic colitis. All patients had 170-kDa amebic antigen in serum, compared with 1 of 50 cyst passers and 1 of 31 controls (P < .01). Seven days after treatment, serum and fecal 170-kDa antigen became undetectable in 12 of the 13 patients (P < .001). Serum anti-LC3 IgA was found in 83.8% of colitis patients, compared with 2% of controls and 12% of asymptomatic cyst passers (P < .001). Salivary and fecal anti-LC3 IgA levels were higher in patients than in cyst passers (P < .001). In conclusion, in amebic colitis, development of humoral and mucosal IgA responses to the recombinant LC3-encoded protein correlates with detection of amebic 170-kDa antigen in serum and feces.
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