SUMMARY
In vitamin D deficient rats the influence of diphenylhydantoin (DPH) and phénobarbital (PB) pretreatment on intestinal uptake of 45calcium and on the activity of CaBP was studied. The DPH rats show in contrast to the PB and control rats a significantly reduced intestinal uptake of 45calcium. However, the activity of CaBP was similar in all investigated groups. These results suggest a possibly special effect of DPH on the development of the calcium and bone disorders that have been observed in patients treated with anticonvulsant drugs.
RÉSUMÉ
On a étudié chez des rats qui manquaient de vitamine D, l'effet d'un pré‐traitement avec de la diphénylhydantoïne (DPH) et du phénobarbital (PB) sur l'absorption intestinale de calcium 45 et sur l'activité du CaPB.
Les rats qui avaient du DPH, en opposition aux rats de contrôle et aux rats avec PB, avaient une absorption intestinale de calcium 45 significativement réduite.
L'activité du CaPB était cependant semblable chez tous les groupes. Ces résultats suggèrent un effet possible particulier de la DPH sur l'origine des troubles du calcium et du métabolisme des os, qui ont été observés chez des patients en traitement avec des produits anticonvulsivants.
Sera from 75 patients with clinical type I allergy against dogs were investigated by means of immunoblotting using extracts prepared from dog hair/dander (CAN XI D) and saliva. In addition, selected sera were tested on extracts made of hair, skin, salivary glands (parotis and submandibularis), serum and liver. A 69-kD IgE-binding protein was identified in all extracts tested with an incidence of approximately 40% and shown to be dog albumin by means of inhibition experiments. In 96% of patients’ sera IgE antibodies reactive with a 19-kD and/or a 23-kD protein of the hair/dander extract (CAN XID) were observed. IgE binding to a 23-kD band was also detected in the hair and saliva extracts, but not in skin, salivary gland, serum and liver extracts. A 19-kD IgE-binding protein was strongly expressed in skin and to a lesser degree in saliva, but not in hair, serum and liver. Preincubation of patients sera with the hair extract and subsequent probing with the hair/dander extract (CAN XI D) inhibited IgE binding to the 23 kD protein whereas preincubation with the skin extract abolished IgE binding to the 19-kD protein. Using the hair/dander extract as inhibitor, IgE binding to the 19- and 23-kD proteins of saliva was abrogated. Thus it is concluded that the 23-kD protein is preferentially expressed in hair and saliva whereas the 19-kD protein is found in saliva and skin. Furthermore these two proteins are likely to represent immunologically independent major allergens.
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