Johan Spetz

Learn More
Three experiments were performed. In Experiment I, triads of adult castrated male mice were chronically administered with either oil-vehicle or 80 micrograms/day of dehydroepiandrosterone (D) or 3-beta-methylandrost-5-en-17-one (D-CH3). They were subsequently tested for their attack on a lactating intruder female introduced for 15 min in their home-cage, 2(More)
There is need for better therapeutic options for neuroendocrine tumours. The aim of this review was to summarize results of experimental animal studies and raise ideas for future radionuclide therapy based on high expression of somatostatin (SS) receptors by many neuroendocrine tumours. In summary, one of the major options is individualized treatment for(More)
BACKGROUND In cancer radiotherapy, knowledge of normal tissue responses and toxicity risks is essential in order to deliver the highest possible absorbed dose to the tumor while maintaining normal tissue exposure at non-critical levels. However, few studies have investigated normal tissue responses in vivo after (211)At administration. In order to identify(More)
BACKGROUND (131)I and (211)At are used in nuclear medicine and accumulate in the thyroid gland and may impact normal thyroid function. The aim of this study was to determine transcriptional profile variations, assess the impact on cellular activity, and identify genes with biomarker properties in thyroid tissue after (131)I and (211)At administration in(More)
BACKGROUND 211At-labeled radiopharmaceuticals are potentially useful for tumor therapy. However, a limitation has been the preferential accumulation of released 211At in the thyroid gland, which is a critical organ for such therapy. The aim of this study was to determine the effect of absorbed dose, dose-rate, and time after 211At exposure on genome-wide(More)
Small unisexed groups (triads) of either male of female Swiss strain mice attack lactating intruders introduced into their home-cages. Female residents are, however, generally much more aggressive towards such intruders than are males. Ovariectomy of female residents (on day 15 or day 50 of life) has little effect on such responses, but castration of male(More)
Humans are exposed to 131I in medical diagnostics and treatment but also from nuclear accidents, and better knowledge of the molecular response in thyroid is needed. The aim of the study was to examine the transcriptional response in thyroid tissue 24 h after 131I administration in rats. The exposure levels were chosen to simulate both the clinical(More)
Non-targeted effects can induce responses in tissues that have not been exposed to ionizing radiation. Despite their relevance for risk assessment, few studies have investigated these effects in vivo. In particular, these effects have not been studied in context with thyroid exposure, which can occur e.g. during irradiation of head and neck tumors. To(More)
BACKGROUND 177Lu-[DOTA0, Tyr3]-octreotate (177Lu-octreotate) is used for treatment of patients with somatostatin receptor (SSTR) expressing neuroendocrine tumors. However, complete tumor remission is rarely seen, and optimization of treatment protocols is needed. In vitro studies have shown that irradiation can up-regulate the expression of SSTR1, 2 and 5,(More)
The effect of the narcotic antagonist naloxone (a mu blocker at low doses) on the attack displayed by castrated male mice towards lactating intruders was investigated. Naloxone at doses of 1 mg and 2 mg/kg decreased attacks an effect which was also evident to a lesser extent at 0.75 mg/kg. These findings suggest a role for endogenous opiates in the(More)