Increased serum beta2-microglobulin levels in active celiac disease.

Sixty-eight sera from 36 children with celiac disease (CD) were collected in a 4-year study, and the levels of beta2-microglobulin (beta2M), orosomucoid, alpha1-antitrypsin, and C-reactive protein (CRP) were measured. A simultaneous intestinal biopsy was taken in all the patients and used to classify them. The values of beta2M were 1.94 +/- 0.49 mg/L in group A (inactive CD with normal intestinal biopsy) and 2.58 +/- 0.76 mg/L in group B (active CD with flat mucosa). These levels were higher than in the normal controls (1.87 +/- 0.49 mg/L, p less than 0.005) and in the other 19 patients with chronic diarrhea of another cause (1.72 +/- 0.63 mg/L, p less than 0.005). CRP values were generally normal; orosomucoid and alpha1-antitrypsin were variable and they did not correlate with beta2M levels. Beta2M was increased at the time of diagnosis in seven of eight (87.5%) of the CD children and only in three of 19 (15.7%) of nonceliac patients with chronic diarrhea of another cause (p less than 0.005). In 12 children with CD, serial studies were possible. The highest beta2M level coincided with a flat mucosa in 10 cases. The increase of beta2M could be related to the intestinal infiltration or even to the lymphocyte activation. It may also be a useful noninvasive method for evaluating the activity of CD.