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Endocrine intervention during irradiation does not prevent damage to the thyroid gland
H M van Santen1, J E van Dijk, H Rodermond
1Department of Pediatric Endocrinology, Emma Children's Hospital, Academic Medical Centre, 1100 DE Amsterdam, The Netherlands. h.m.vansanten@amc.uva.nl
Summary
Thyroid-stimulating hormone (TSH) manipulation did not protect rats from radiation-induced thyroid damage. Inhibiting thyroid activity with thyroxine or iodine during x-irradiation showed no significant reduction in hypothyroidism or thyroid carcinoma.
Area of Science:
- Endocrinology
- Radiation Oncology
- Experimental Pathology
Background:
- Head and neck radiation can cause thyroid gland damage, including hypothyroidism and thyroid carcinoma.
- Previous attempts to protect the thyroid by lowering plasma thyroid-stimulating hormone (TSH) have yielded unclear results.
Purpose of the Study:
- To investigate the radioprotective potential of inhibiting thyroid gland activity during X-irradiation.
- To evaluate the efficacy of endocrine interventions in preventing radiation-induced thyroid damage.
Main Methods:
- 80 Wistar rats were used, with 64 receiving 15 Gy cervical irradiation.
- Endocrine interventions included thyroxine (T4), T4 plus iodine, or iodine alone, compared to a placebo group during irradiation.
- Plasma TSH and T4 levels were monitored, and histological examinations of various organs were performed at 6 and 54 weeks post-irradiation.
Main Results:
- Plasma TSH levels decreased with T4 administration and increased with iodine administration during the intervention period.
- No significant differences in the incidence of hypothyroidism or thyroid carcinoma were observed among the intervention and placebo groups at 6 or 54 weeks.
- Histological analysis did not reveal significant protective effects from the endocrine interventions against radiation-induced thyroid damage.
Conclusions:
- Administration of thyroxine, iodine, or their combination during X-irradiation does not protect against radiation-induced thyroid damage.
- Inhibiting thyroid activity via these endocrine interventions is ineffective in preventing hypothyroidism or thyroid carcinoma following cervical irradiation.
- Further research may be needed to explore alternative radioprotective strategies for the thyroid gland.