Contribution of testosterone to the clock system in rat prostate mesenchyme cells.

Circadian rhythms are modulated in a variety of peripheral tissues including the prostate, in which the mesenchyme and epithelium cells are controlled under androgens. Here, we investigated the testosterone regulation of core clock genes such as Bmal1, Clock, Per2 and Nr1d1 under a deficient state of testosterone. In vivo studies showed that the Bmal1 mRNA expression in the prostates displayed a peak at ZT 20 and a trough at ZT 12. Both Bmal1 and Clock transcripts decreased after castration. Conversely, the expression of Per2 that is promoted by binding of Bmal1 and Clock heterodimers to the E-box, enhanced or did not decease at least within 1 week after castration. The clock gene transcripts were recovered to the intact levels, when 1 mg testosterone was administered daily for 5 days. Fluorescent immunohistochemical studies revealed the increased staining of caspase 3 in the epithelium and Per2 in both the mesenchyme and epithelium after 1-week castration. In the mesenchyme cells prepared from castrated rats, the Per2 oscillation was generated in response to dexamethasone. The circadian rhythms of Bmal1 and Nr1d1 transcripts were obviously antiphase in the cells. However, the mesenchyme cells displayed the different profiles in the presence or absence of testosterone; the amplitude of the first phase was significantly decreased by testosterone. Addition of testosterone significantly increased the transcripts of Bmal1, Clock and Casp3 in cultured cells, whereas the Per2 and Nr1d1 transcripts were significantly inhibited. Collectively, the present results demonstrated that Bmal1 and Clock, but not Per2 and Nr1d1, are down-regulated in mesenchyme cells by testosterone deficiency. In addition to the conservative interlocked transcriptional-translational feedback loop, it is strongly suggested that the prostate clock system is controlled under androgen.

Clinical-pathological varieties of gliosarcoma: report of two cases.

The authors present two tumour cases, in both of which the diagnosis of gliosarcoma was made. The two cases differ histologically, one being a tumour clearly consisting of two different parts, the other being a tumour seemingly composed of cells with multipotential differentiation. Pathological and radiological studies are shown as well as the clinical course of the cases.

[A case of cranial and intracranial metastasis from testicular seminoma].

The case presented is of a 44-year-old man with skull and intracranial metastasis of seminoma. He was operated on for a testicular tumor at 41 years of age. Pathologically, it was pure seminoma. Coronal CT scan showed tumor invasion of the subcutaneous vault, and of the epidural and intraparenchymal region of the right parietal region. We treated him with a combination of surgical excision, radiation and PVB chemotherapy. He was neurologically disease-free for ten months after being discharged. However, he then succumbed to liver metastasis of seminoma. Seminoma mainly metastasizes via the lymph stream. CNS metastasis of seminoma is only 0.7% in Japan. We would like to stress that prophylactic chemotherapy would be essential even after patients get remission from CNS metastasis of seminoma.

[A meningioma associated with AVM: a case report].

This paper reports a case of meningioma associated with AVM. A 67 years old lady showed transient rt. lower hemiparesis with severe headache, nausea and consciousness disorder. Bilateral carotid angiogram and CT scan revealed lt. convexity meningioma and AVM. Lt MCA and ACA entered into the AVM from which several draining vessels entered into the deep venous system. These two lesions were removed by one stage. It is quite rare that cerebral tumor associates with intracranial AVM. Only two cases of meningioma associated with AVM have been reported.