Eiki Hanada

Gamma-Glutamylcyclotransferase: A Novel Target Molecule for Cancer Diagnosis and Treatment

Gamma-glutamylcyclotransferase (GGCT) is one of the major enzymes involved in glutathione metabolism. However, its gene locus was unknown for many years. Recently, the gene for GGCT was found to be identical to C7orf24, which is registered as a hypothetical protein. Orthologs have been found in bacteria, plants, and nematodes as well as higher organisms, and the GGCT gene is highly preserved among a wide range of species. GGCT (C7orf24) was also reported as an upregulated protein in various cancers. Although the function of GGCT in cancer cells has not been determined, the following important activities have been reported: (1) high expression in various cancer tissues and cancer cell lines, (2) low expression in normal tissues, (3) inhibition of cancer cell proliferation via anti-GGCT RNAi, (4) inhibition of cancer cell invasion and migration via anti-GGCT RNAi, (5) an epigenetic transcriptional regulation in cancer cells, and (6) an antitumor effect in cancer-bearing xenograft mice. Therefore, GGCT is promising as a diagnostic marker and a therapeutic target for various cancers. This review summarizes these interesting findings.

The Effect of d-Aspartate on Spermatogenesis in Mouse Testis

ABSTRACT Spermatogenesis is controlled by hormonal secretions from the hypothalamus and pituitary gland, by factors produced locally in the testis, and by direct interaction between germ cells and Sertoli cells in seminiferous tubules. Although the mammalian testis contains high levels of d-aspartate (d-Asp), and d-Asp is known to stimulate the secretion of testosterone in cultured Leydig cells, its role in testis is unclear. We describe here biochemical, immunohistochemical, and flow cytometric studies designed to elucidate developmental changes in testicular d-Asp levels and the direct effect of d-Asp on germ cells. We found that the concentration of d-Asp in mouse testis increased with growth and that fluctuations in d-Asp levels were controlled in part by its degradative enzyme, d-aspartate oxidase expressed in Sertoli cells. In vitro sperm production studies showed that mitosis in premeiotic germ cells was strongly inhibited by the addition of d-Asp to the culture medium. Moreover, immunohistochemical analysis demonstrated that d-Asp accumulated in the differentiated spermatids, indicating either transport of d-Asp to spermatids or its de novo synthesis in these cells. Such compartmentation seems to prevent premeiotic germ cells in mouse testis from being exposed to the excess amount of d-Asp. In concert, our results indicate that in mouse testis, levels of d-Asp are regulated in a spatiotemporal manner and that d-Asp functions as a modulator of spermatogenesis.

Proteome research in urothelial carcinoma.

In all creatures including humans, the molecules that function in accordance with the genetic code are mainly proteins. After completing the sequencing of the human genome, rapid progress has been made in proteome analysis. The primary structures of almost all proteins were determined by the human genome sequence. However, the whole picture of proteins cannot be elucidated because of alternative splicing and post‐translational modifications. Therefore, genomic as well as systematic and comprehensive information of proteins is required. Modern methods of proteomics have dramatically improved the quality and speed of protein analysis. Developments in both bioinformatics and mass spectrometry have contributed to the technical improvement, making it possible to identify proteins in a short time with high accuracy even from a very small sample. In the field of cancer research, many studies of useful diagnostic and prognostic biomarkers using these proteomic technologies have been reported, and target molecules for treatment have been explored. The aim of the present review was to summarize the basic technologies of proteomics and recent research in the field of urothelial cancer obtained using proteomic methods.

Advanced Childhood Testicular Yolk Sac Tumor With Bone Metastasis: A Case Report

We report a case of advanced childhood testicular yolk sac tumor with bone metastasis, which was successfully treated by multimodal treatment. Optimal management of bone metastases from testicular yolk sac tumor in childhood is discussed.

Successful treatment of chemo-refractory pulmonary metastases of renal pelvic cancer by second-line chemotherapy including gemcitabine followed by salvage surgery

Abstract  A 51‐year‐old woman developed multiple pulmonary metastases after receiving nephroureterectomy and two cycles of adjuvant chemotherapy for the treatment of renal pelvic transitional cell carcinoma. All metastases disappeared after four cycles of methotrexate, vinblastine, doxorubicin and cisplatin (M‐VAC) chemotherapy followed by radiotherapy; however, 8 months later two pulmonary metastases recurred. The patient was entered into a phase I study of combination chemotherapy with gemcitabine, etoposide and cisplatin, designed for chemorefractory urothelial cancer. The lung masses showed significant reduction after two cycles of this chemotherapy; following salvage surgery, the patient has been well with no evidence of recurrence for more than 3 years.

Indocyanine Green Angiography-assisted Laparoendoscopic Single-site Varicocelectomy

OBJECTIVE To study the efficacy of a new laparoscopic varicocelectomy technique using indocyanine green (ICG) angiography. METHODS Laparoendoscopic single-site (LESS) varicocelectomy using ICG angiography was performed in a single institution on 11 patients with a grade 2 or 3 varicocele. Adult men (N = 9, 82%) who were apparently infertile and had a varicocele, as well as prepubertal boys (N = 2, 18%) with testicular growth retardation, underwent a LESS varicocelectomy using ICG angiography. After the separation of testicular veins, arteries, and lymphatics, ICG was injected intravenously, and arterial and venous blood flows were observed by ICG fluorescence. Spermatic veins were cauterized by bipolar forceps and cut. The spermatic artery and lymphatics were preserved. RESULTS The mean time to the arterial phase (AP) from the ICG injection was 34.9 seconds and the mean time to the venous phase was 58.3 seconds. The mean interval from the arterial phase to the venous phase was 23.3 seconds, and in all cases, this time interval facilitated the identification of arteries and veins. The rates of residual varicocele 3 and 6 months after surgery were 9.1% and 0%, respectively. Serious postoperative complications were not observed nor were adverse events induced by ICG. CONCLUSION ICG angiography appears to be safe and appears to facilitate the detection of artery and veins during LESS varicocelectomy. Continuing investigations of efficacy are required of this new and promising procedure in a larger number of patients.

V9-05 LAPAROSCOPIC VARICOCELECTOMY USING INTRAOPERATIVE NAVIGATION: INDOCYANINE GREEN ANGIOGRAPHY AND INDIGO CARMINE LYMPHATIC DYE

INTRODUCTION AND OBJECTIVES: Male circumcision (MC) provides a variety of medical benefits, including a 50-60% reduced risk of HIV transmission. The ShangRing is one of two WHO-prequalified MC devices and it comprises a key component of the scale-up of MC services in Africa. The No-Flip ShangRing circumcision technique represents a further simplification of this procedure. The objective of this study was to evaluate the outcomes of this technique in African adults and adolescents with regard to procedure duration, pain, adverse events, healing time, and patient satisfaction. Further, we sought to compare safety, healing rates and patient satisfaction after ring removal at 7 days versus spontaneous detachment. METHODS: We enrolled patients 10 years of age or older at two study sites in Kenya. All procedures were performed by physicians or nurses trained in the No-Flip ShangRing technique. Patients were randomized in 1:1 fashion to ring removal at 7 days versus spontaneous detachment. Outcomes were assessed weekly until 42 days or complete wound healing. RESULTS: 230 patients were enrolled in this study, age ranges 10 to 54. Over 80% of circumcisions were performed by nurses trained in the No-Flip technique. All patients (230/230) were suitable for ShangRing MC regardless of the presence of phimosis or adhesions. On subgroup analysis of patients 10-15 years of age versus >15 years, though more patients in the younger group required a dorsal slit and breaking down of adhesions prior to ring insertion, there was no difference in operative time and all circumcisions were successfully completed (Table 1). There was no difference in pain or adverse events between the age groups, and there was 97% patient satisfaction in both groups. Within the group randomized to spontaneous detachment, 72.4% of patients experienced detachment at median 14 days; 27.6% of patients requested ring removal due to pain or discomfort. There were no differences between spontaneous detachment and 7-day removal with regard to healing time, adverse events, or patient satisfaction. CONCLUSIONS: The No-Flip ShangRing procedure is simple, safe, effective, and acceptable for use in patients 10 years of age or older. Spontaneous detachment is safe and effective, and has the potential to reduce the burden of service provision in resource-poor settings.

Metastatic Prostatic Ductal Adenocarcinoma Successfully Treated with Docetaxel Chemotherapy: A Case Report

A 68-year-old man presented with gross hematuria. A papillary urethral tumor adjacent to the verumontanum was found by cystourethroscopy. Serum prostate-specific antigen (PSA) was 3.246 ng/ml. A transurethral biopsy specimen was most suggestive of a primary urothelial carcinoma of the prostate, for which a radical cystoprostatectomy was performed. The final pathology was prostatic ductal adenocarcinoma with very focal acinar features (Gleason score 5 + 4 = 9, pT3bN0M0). Local recurrence and pelvic bone metastases developed 17 months later, and his PSA rose to 10.806 ng/ml. He was treated with combined androgen blockade and radiation. Two years later, the lesion showed progressive growth. Treatment followed with docetaxel (70 mg/m2 every 3 weeks) and prednisolone 5 mg twice daily. After 10 cycles of chemotherapy, all lesions disappeared and PSA decreased to <0.005 ng/ml. Three years after chemotherapy, he maintains a complete response without any additional treatments. Docetaxel chemotherapy can be an effective treatment for patients with recurrent prostatic ductal adenocarcinoma.