Effect of Radiotherapy on the Levels of Secretory Immunoglobulin A Against Indigenous and Virulent Streptococci
| Autor: | Iwao Yoshioka, Akikatsu Kataura, Tetsuo Himi, Hideaki Kita, Yasushi Kukuminato |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Immunoglobulin A
medicine.medical_treatment Virulence Oropharynx Pneumococcal Infections Salivary Glands Epitopes Antigen Streptococcus mitis Streptococcal Infections medicine Humans Cobalt Radioisotopes Radiation Injuries Saliva Respiratory Tract Infections Aged Antigens Bacterial Stomatitis biology Radiotherapy business.industry Head and neck cancer Respiratory infection Streptococcus Radiotherapy Dosage Middle Aged medicine.disease biology.organism_classification Radiation therapy Titer Streptococcus pneumoniae Otorhinolaryngology Head and Neck Neoplasms Immunology Immunoglobulin A Secretory biology.protein Surgery Radiopharmaceuticals Streptococcus sanguis business Secretory Rate Follow-Up Studies |
| Zdroj: | Otolaryngology–Head and Neck Surgery. 117:433-437 |
| ISSN: | 1097-6817 0194-5998 |
| DOI: | 10.1016/s0194-59989770010-x |
| Popis: | It is well known that the frequency of upper respiratory infection is clinically increased after radiotherapy of the head and neck region. This study found higher antibacterial secretory immunoglobulin A (S-IgA) activity against three indigenous streptococci (Streptococcus mitis, S. salivarius, and S. sanguis I) and S. pneumoniae in patients who had undergone radiation therapy of the head and neck region than in control subjects. This showed no relation to the extent of the radiation field. Compared with before radiotherapy, the S-IgA titer against S. pneumoniae and its ratio to the activities against the indigenous streptococci were significantly higher in patients with fully irradiated major salivary glands. These results indicated that the radiotherapy promoted the antigen-specific S-IgA production of virulent streptococci in most patients with head and neck cancer, even more than 6 months after radiotherapy. The resulting altered balance in the S-IgA system of normal indigenous streptococci may also impair the ability to maintain the stable bacterial interference between normal indigenous and virulent streptococci in the oropharyngeal cavity. |
| Databáze: | OpenAIRE |
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