PubMed Health⌕ Search

Biomedical subjects

T Klemola

Publications and source records attributed to T Klemola.

23 records · Page 2Linked to original sources
PubMed1988

Serum IgG subclass levels in paediatric clinic patients with variable degrees of IgA deficiency.

We measured IgG subclass levels by radial immunodiffusion with polyclonal antisera in 60 patients with IgA deficiency. The low IgA levels were measured by a sensitive and specific enzymoimmunometric method. None of the patients had complete deficiency of IgG2, but 4 patients had serum levels of IgG2 and 4 of IgG3 below the range for controls. Elevated levels of IgG1 were found in patients with juvenile rheumatoid arthritis and coeliac disease. None of the patients with coeliac disease or juvenile rheumatoid arthritis had low IgG2 or IgG3 levels. The levels of IgG4 were highly variable but patients with coeliac disease had particularly high values. The severity of IgA deficiency did not correlate with the level of serum IgG2.

Adolescent↗
PubMed1987

HLA-DR expression, natural killer cells and IgE containing cells in the jejunal mucosa of coeliac children.

The expression of HLA-DR by surface and crypt epithelium and the numbers of cells of natural killer (NK) phenotype and of IgE containing cells were studied with monoclonal antisera using the peroxidase technique. We examined 48 jejunal biopsy specimens taken from 35 coeliac children before treatment (11), during gluten free diet (20) and after gluten challenge (17), and 13 control specimens. The luminal surface of the epithelial cells stained with HLA-DR antiserum in all specimens, but the cytoplasm of the surface epithelial cells took up the stain more frequently in the specimens from the controls (5/13) than those from the coeliacs (2/48) (p less than 0.01). In 21/28 specimens taken from coeliacs when on a gluten containing diet the crypt epithelium showed strong HLA-DR expression, while only 4/20 (p less than 0.01) specimens of coeliacs on a gluten free diet and 1/13 specimens of controls had similar staining. Among the intraepithelial lymphocytes no cells of NK phenotype were found in specimens from patients or controls. As compared with control specimens biopsy specimens from untreated coeliac patients showed smaller numbers of NK cells in the lamina propria. No difference was found in the numbers of IgE containing cells between the patients and controls. The strong expression of HLA-DR by the crypt epithelial cells in coeliac children on a normal diet suggest that these cells are involved in the presentation of the antigen.

Adolescent↗
PubMed1986

Mumps IgA antibodies are not absorbed from human milk.

We measured mumps virus specific IgA antibodies in the sera of preterm infants after a feeding period on human milk rich in such antibodies. In full-term infants the possibility of absorption was determined from the content of these antibodies in the child's mother's milk, an umbilical cord blood sample and a later serum sample. No absorption of IgA antibodies was found.

Antibodies, Viral↗
PubMedDate not supplied

Immunohistochemical findings in the intestine of IgA-deficient persons: number of intraepithelial T lymphocytes is increased.

We studied jejunal biopsy specimens of 13 IgA-deficient persons (IgAdp) and 12 controls. Four Ig-Adp had celiac disease, in the others the jejunal mucosa appeared normal. Monoclonal antibodies and the peroxidase technique were used to identify T lymphocytes, T-lymphocyte subsets, HLA-DR antigens, and IgE-containing cells in the lamina propria and epithelium. Intraepithelial lymphocytes (IEL); goblet cells; and IgA-, IgG-, and IgM-containing cells were counted in paraffin sections. Both IgAdp with normal jejunal structure and IgAd celiacs on gluten-free diet (p less than 0.001 and p less than 0.01 versus controls, respectively) had decreased numbers of IgA-containing cells, and an increased number of IgM-containing cells (p less than 0.01) was noted in the IgAdp with normal jejunal structure. The IgAdp with normal intestines had increased numbers of intraepithelial lymphocytes (mean 57 cells/mm versus 33 in controls, p less than 0.01) and so did the IgAd celiacs after gluten challenge (mean 74, p less than 0.001). The HLA-DR antibody stained the epithelial cells of the IgAd celiacs differently from those of controls and IgAdp with normal intestines: the whole cytoplasm was never stained in the celiacs, but in six of 12 controls (p less than 0.05) and during gluten challenge, the crypt cells of the IgAd celiacs showed strong staining, never seen in a normal intestine (p less than 0.05 compared with pre-challenge specimens). The increase in IEL number in the jejunal mucosa of IgAdp probably indicates ineffective antigen exclusion.

Antibodies, Monoclonal↗