Low-energy laser irradiation accelerates the velocity of tooth movement via stimulation of the alveolar bone remodeling

INTRODUCTION

Previously, the authors have reported the acceleration of tooth movement and osteoclastogenesis on the pressure site in an experimental tooth movement model by low-energy laser irradiation (LELI), which stimulated the RANK/RANKL system and c-fms/macrophage colony-stimulating factor system. However, the effect of LELI on osteogenesis on the tension site is not known clearly. Moreover, the temporal changes in alveolar bone during tooth movement have not been investigated as yet. Therefore, the present study was designed to examine the effects of LELI on alveolar bone remodeling during experimental tooth movement, and observe the temporal bone mineral density (BMD) using micro-computed tomography (muCT).

MATERIALS AND METHODS

To induce experimental tooth movement in rats, 10 g force was applied to the upper right first molar with Nickel titanium closed-coil. Next, a gallium-aluminum-arsenide (Ga-Al-As) diode laser was used to irradiate the area around the moved tooth, and BMD and the amount of tooth movement were measured by muCT scanning for 21 days. Histopathological examination was also performed.

RESULTS

The amount of tooth movement in the LELI group was significantly greater than in the non-irradiation group by the end of the experimental period. Further, compared with the non-irradiation group, the fall of BMD was less in the LELI group.

CONCLUSION

These findings suggest that LELI accelerates the velocity of tooth movement via stimulation of the alveolar bone remodeling.

The effects of Gosha-jinki-gan on oxaliplatin-related neurotoxicity: A prospective randomized study

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Background: Oxaliplatin is now considered a standard treatment for advanced or unresectable colorectal cancer, but sensory neurotoxicity is its dose-limiting toxicity. The OPTIMOX (stop and go) approach offers a reasonable strategy, but preventive agent is not established. It is reported that Gosha-jinki-gan (a blended herbal medicine) is recently considered as an effective agent for the neurotoxicity of taxanes and for vibration sensation in patients with diabetic neuropathy. Patients and Methods: From 2007, 32 patients treated with modified FOLFOX6 for advanced or unresectable colorectal cancer were randomized. Fifteen patients received oral administration of 7.5 g/day of Gosha-jinki-gan (G group) every days from first course and 17 patients (Control group) did not. Neurotoxicities were evaluated every course according to DEB-NTC (Neurotoxicity Criteria of DEBIOPHARM) and NCI-CTCAE Ver.3.0 using self-check sheet. Results: The median number of cycles of per patient of G group was 14 (range, 4–26), and that of C Group was 9 (range, 1–20). Cumulative dose of oxaliplatin of two groups was 1,190 mg/m2 (G group) and 765 mg/m2 (C Group). Peripheral neurotoxicity evaluated by DEB-NTC in Group G was grade 0 in 0 patients (0%), grade 1 in 11 (73%), grade 2 in 4 (27%) and grade 3 in 0 (0%) and, in C group, respectively, 1 (6%), 6 (35%), 7 (41%), 3 (18%). According to NCI-CTCAE, neurotoxicity was lower in G group than that of C group. Fifteen patients in G group were evaluated by RECIST criteria with a PR rate of 66.7%, SD rate of 20.0% and PD rate of 13.3%. Seventeen patients in C group were evaluated by RECIST criteria with a PR rate of 52.9%, SD rate of 35.3% and disease control rate of 11.8%. Conclusion: Gosha-jinki-gan is effective for preventing oxaliplatin-induced neuropathy in advanced or unresectable colorectal cancer patients.

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Behavior of solutions of the Hodgkin-Huxley equations and its relation to properties of mechanoreceptors

The membrane current in the Hodgkin-Huxley equations is considered to be a stimulus to the membrane and the responses to the simulus are numerically calculated. Responses of the Hodgkin-Huxley model to an alternating current superimposed upon a constant bias current show qualitative analogy to responses of biological mechanoreceptors. The intensity of the bias current seems to correspond to the degree of adaptation of actual receptors.

A successful pregnancy and delivery after resectoscopic surgery for early invasive endometrial cancer

Among young women, the incidence of uterine corpus cancer is increasing. Most young women can not preserve fertility because simple total hysterectomy with bilateral salpingo-oophorectomy is the standard method for early endometrial cancer so far. We present a case of early endometrial adenocarcinoma which succeeded in pregnancy and delivery after resectoscopic surgery. Following a circumferential resection of the lesion including the mucosa and muscle layer under resectoscopic guidance, the patient became pregnant by means of in vitro fertilization-embyo transfer with hormone replenishment. She underwent cesarean section at 33 weeks and five days of gestation and had a healthy baby. Resectscopic surgery can help to preserve fertility among young women who have early invasive endometrial cancer.

Low-energy laser stimulates tooth movement velocity via expression of RANK and RANKL

OBJECTIVE

Recent studies have demonstrated that low-energy laser irradiation stimulates bone formation in vitro and in vivo. However, very little is known about the effects of laser irradiation on osteoclastogenesis. The receptor activator of the nuclear factor-kB (RANK) / RANK ligand (RANKL) / osteoprotegerin (OPG) system is essential and sufficient for osteoclastogenesis. The present study was designed to examine the effects of low-energy laser irradiation on expressions of RANK, RANKL, and OPG during experimental tooth movement.

DESIGN

To induce experimental tooth movement in rats, 10 g of orthodontic force was applied to the molars. Next, a Ga-Al-As diode laser was used to irradiate the area around the moved tooth and the amount of tooth movement was measured for 7 days. Immunohistochemical staining with RANK, RANKL, and OPG was performed. Real time PCR was also performed to elucidate the expression of RANK in irradiated rat osteoclast precursor cells in vitro.

RESULTS

In the irradiation group, the amount of tooth movement was significantly greater than in the non-irradiation group by the end of the experimental period. Cells that showed positive immunoreactions to the primary antibodies of RANKL and RANK were significantly increased in the irradiation group on day 2 and 3, compared with the non-irradiation group. In contrast, the expression of OPG was not changed. Further, RANK expression in osteoclast precursor cells was detected at an early stage (day 2 and 3) in the irradiation group.

CONCLUSION

These findings suggest that low-energy laser irradiation stimulates the velocity of tooth movement via induction of RANK and RANKL.

Identification of EGFR mutations in esophageal cancer

BACKGROUND

It is well known that the prognosis for esophageal cancer is worse than for other digestive cancers in spite of multimodality treatment, and there is an urgent need to improve this situation. The epidermal growth factor receptor (EGFR) inhibitor, gefitinib, was approved in Japan to treat advanced non-small cell lung cancer patients and several papers have since reported that the successfully treated patients had genetic mutations in EGFR.

PURPOSE

The aim of this study was to investigate the existence of EGFR mutations in esophageal cancer cell lines and primary lesions, and also to explore the possibility of treating esophageal cancer using gefitinib.

MATERIALS AND METHODS

Nineteen esophageal cancer cell lines were cultured and DNA was extracted using an ultracentrifugation method. Fifty cases of primary cancer and corresponding normal tissue samples were obtained and DNA was extracted using the same protocol. Nested PCR and DNA sequencing targeting exons 18, 19, 20 and 21 of EGFR were performed to investigate the presence of mutations in esophageal cancer cell lines and primary tumors.

RESULTS

Three of the 19 cell lines had the same silent mutation at nucleotide 2607, a G-to-A substitution in exon 20. One of the 50 patients had an EGFR mutation in codon 719, resulting in an amino acid substitution from glycine to aspartic acid.

CONCLUSION

EGFR mutations in esophageal carcinoma are rare but do exist, and thus gefitinib could be included in esophageal cancer treatment regimens by selecting those patients who possess such mutations.

Development and assessment of morphologic criteria for diagnosing gastric cancer using confocal endomicroscopy: an ex vivo and in vivo study

BACKGROUND AND STUDY AIMS

The Confocal Endomicroscopy System (Optiscan Pty Ltd. and Pentax Corp.) is a newly developed imaging tool that uses laser light and optical technology to visualize living tissue at the cellular level. Digital images of cells magnified 1000-fold appear in real time on a computer screen, which enables immediate detection of changes in cellular structure without the need for a biopsy. The aim of this study was to assess the features of the cellular architecture of cancerous tissue that can be used in the differential diagnosis of cancerous tissue and normal mucosa using this system's image-processing software.

PATIENTS AND METHODS

A total of 27 gastric cancers were examined ex vivo using confocal endomicroscopy. A fluorescent contrast agent, acriflavine, was applied topically to normal and to cancerous mucosa. In vivo imaging of the gastric mucosa after intravenous injection of fluorescein sodium was also performed in nine patients with gastritis or gastric cancer.

RESULTS

The nuclear area in the ex vivo specimens was calculated using Scion Image software. The mean nuclear area of cancer cells was found to be significantly larger than that of normal cells in 18/27 gastric cancers (67 %). The mean nuclear area of the cancers tended to be larger than that of normal mucosa, especially in cases of differentiated adenocarcinoma. In more than half the cases, it was possible to diagnose malignancy automatically using confocal endomicroscopy and image-processing software without the need for biopsy and pathological examination. In vivo imaging of cancerous lesions showed irregularity in cellularity and vascularity.

CONCLUSION

The ability of this imaging device to differentiate between normal tissue and cancerous tissues gives it potential value as a new screening tool for early detection of malignancy.

Aberrant DNA methylation of imprinted loci in superovulated oocytes

BACKGROUND

There is an increased incidence of rare imprinting disorders associated with assisted reproduction technologies (ARTs). The sex-specific epigenetic modifications that are imposed during gametogenesis act as a primary imprint to distinguish maternal and paternal alleles. The most likely candidate for the gametic mark is DNA methylation. However, the timing of DNA methylation acquisition in adult oocytogenesis and the effects of superovulation are unknown.

METHODS

We examined the maternal methylation of PEG1(MEST), LIT1(KCNQ1OT1) and ZAC(PLAGL1) and the paternal methylation of H19 in adult growing oocytes of humans and mice and compared them with the methylation status of mouse neonatal growing oocytes by using bisulphite sequencing. Furthermore, we examined the effects of superovulation in the human and mouse.

RESULTS

Maternal methylation of these genes has already been initiated to some extent in adult human and mouse non-growing oocytes but not in mouse neonates. In addition, the methylation dynamics during adult human and mouse oocyte development changed more gradually than those during neonatal oocyte development. Furthermore, we found the demethylation of PEG1 in growing oocytes from some ART-treated infertile women and a gain in the methylation of H19. We also detected methylation changes in superovulated mice.

CONCLUSION

Our studies in the human and mouse suggest that superovulation can lead to the production of oocytes without their correct primary imprint and highlight the need for more research into ARTs.

CEACAM6 gene expression in intrahepatic cholangiocarcinoma

The purpose of this study was to investigate the clinicopathological and biological significance of human carcinoembryonic antigen-related cell adhesion molecule 6 (CEACAM6) gene expression in human intrahepatic cholangiocarcinoma. CEACAM6 is reported to be involved in human malignancies. However, in cholangiocarcinoma expression of CEACAM6 and its clinicopathological significance have not been investigated. CEACAM6 expression status was determined and analysed with respect to various clinicopathological parameters in 23 intrahepatic cholangiocarcinomas. Additionally, we investigated effects of CEACAM6 gene in the cholangiocarcinoma cell lines. CEACAM6 gene expression in cancer tissues was higher than in noncancerous tissues in 16 of the 23 cases; however, it was not statistically significant. The tumours with elevated CEACAM6 expression showed a tendency to be associated with lymphatic invasion and stage of the disease. Interestingly, patients with high CEACAM6 expression showed a significantly poorer disease-free survival rate than those with low CEACAM6 expression. We demonstrated that CEACAM6-transfected cells were more proliferative, more invasive and more chemoresistant to gemcitabine compared to mock-transfected cells. Furthermore, CEACAM6 gene silencing by CEACAM6-specific siRNA resulted in higher chemosensitivity to gemcitabine. CEACAM6 is a potential prognostic indicator and potential chemoresistant marker to gemcitabine for patients with intrahepatic cholangiocarcinoma.

Clinicopathological significance of EZH2 mRNA expression in patients with hepatocellular carcinoma

Enhancer of zeste homologue 2 (EZH2), a member of the polycomb group protein family, plays a crucial role in the regulation of embryonic development and has been associated with the regulation of the cell cycle. Recently, several studies have shown that EZH2 is highly expressed in aggressive tumours, including human breast cancer, prostate cancer, and lymphomas. We thus analysed EZH2 expression using real-time reverse transcription-polymerase chain reaction, and correlated its expression status with various clinicopathological parameters in 66 patients with hepatocellular carcinoma (HCC). We found high expression of EZH2 in human liver cancer cell lines. Furthermore, EZH2 gene-expression levels in tumour tissue specimens (0.34+/-0.52) were significantly higher (P<0.0001) than those in the corresponding nontumour tissue specimens (0.07+/-0.09). The incidence of cancer cell invasion into the portal vein was significantly higher (P<0.001) in the high EZH2 expression group (26 of the 33, 79%) than in the low expression group (13 of the 33, 39%). However, there was no significant difference in the disease-free survival rate between the two groups. The findings of this study indicate that EZH2 mRNA expression was upregulated in human HCC and may play an important role in tumour progression, especially by facilitating portal vein invasion.

Clinical significance of elongation factor-1 delta mRNA expression in oesophageal carcinoma

Elongation factor-1 (EF-1) delta is a subunit of EF-1, which is a protein complex that participates in the elongation step of mRNA translation and has recently been considered to correlate with oncogenic transformation. However, there has been no information regarding the clinical significance of EF-1 delta mRNA expression in malignant tumours, including oesophageal carcinoma. Thus, we quantitated the expression of EF-1 delta in malignant and benign oesophageal tissues and associated these levels with clinicopathologic parameters of oesophageal carcinoma. Paired oesophageal tissue samples from cancerous and corresponding noncancerous parts were obtained from 52 patients who underwent curative oesophagectomy. Quantitative analyses of EF-1 delta expression were performed using real-time quantitative reverse transcription–polymerase chain reaction. Elongation factor-1 delta mRNA overexpression in cancerous tissues compared to normal counterparts was observed in 38 of 52 (73%) patients. The mean expression level of EF-1 delta mRNA in cancerous tissues was significantly higher than that in noncancerous tissues (P<0.01). A higher expression of EF-1 delta was significantly correlated with lymph node metastases (P<0.05) and advanced stages (P<0.05). Furthermore, the cause-specific survival of patients with a higher expression of EF-1 delta was significantly poorer than those with a lower expression (5-year cause-specific survival rates; 23 and 54%, respectively, P<0.05). The results of this study indicated that EF-1 delta mRNA expression was significantly higher in cancerous compared to noncancerous oesophageal tissues, and a higher expression of EF-1 delta mRNA was correlated with lymph node metastases, advanced disease stages and poorer prognosis for patients with oesophageal carcinoma.

Fertilization rates of small-head sperm in conventional IVF and ICSI

Five men produced 23 ejaculates in 23 assisted reproductive technology cycles for semen analysis. In 11 of the 14 ICSI cycles and in 5 of the 9 IVF cycles, small-head sperm were found in more than 70% of the cells, having a length of < 3.5 micro m and a width of < 2 micro m. In 6 of the 14 ICSI cycles, the embryologist who performed the ICSI was not alerted to e presence of small-head sperm. Subsequent fertilization rate was significantly lower than a) the fertilization rate of the remaining 5 ICSI cycles that acted as a control, in which the embryologist was alerted to the presence of small-head sperm, and b) was lower than the 3 ICSI cycles with normal sperm head (p < .05). The 8 cell embryo and blastocyst rates in the former group were also decreased, although not significantly, compared to the latter groups. Likewise, in the 5 IVF cycles with small-head sperm, the fertilization rate was significantly lower than in the 4 IVF with normal sperm head (p < .05). Embryologists should be alerted when a high percentage of small-head sperm are detected during routine semen analysis because they may be associated with reduced fertilization and embryo outcome.

Nerve sheath myxoma of the tongue in a child

Nerve sheath myxoma (NSM) is a benign peripheral nervous system tumour that rarely occurs in the oral cavity. Among 17 cases of oral NSM described in the literature (average patient age 33 years), only two, including the present case, have been reported in children. The present case occurring in an 8-year-old boy was therefore extremely rare. Histopathologically, the tumour was found as multinodules under the mucosal epithelium, and was composed of spindle- or stellate-shaped cells with a myxoid background that stained with alcian blue and toluidine blue. Immunohistochemically, the tumour cells were strongly positive for S-100 beta protein and neuron-specific enolase. These results suggested that the tumour originated from Schwann cells.

Correlation of beta-catenin and cyclin D1 expression in colon cancers

OBJECTIVE

Beta-catenin activates transcription by TCF/LEF and has been regarded as an oncogene in a wide range of malignant tumors. Among various molecules regulated by beta-catenin/Tcf, cyclin D1 is the most likely candidate for stimulation of the oncogenic pathway. The association between beta-catenin and cyclin D1 was investigated using clinical samples from colorectal cancers.

METHODS

The expression of beta-catenin and cyclin D1 was investigated by immunohistochemical analyses of samples from 70 patients with colorectal cancers. In 28 of the fresh tumor samples, beta-catenin protein was separated into soluble and insoluble fractions and quantitatively correlated with cyclin D1 protein by Western blot analysis.

RESULTS

Compared with noncancerous epithelium, beta-catenin and cyclin D1 were overexpressed (+) in 35 (50%) and 30 cases (43%), respectively. Cyclin D1 (+) was observed in 74% (26/35) of beta-catenin (+) cases, but only in 11% (4/35) of the beta-catenin (-) cases. Thus, there was a strong association between the expression of beta-catenin and that of cyclin D1 (p < 0.001). In the Western blot analysis, the amount of cyclin D1 correlated well with beta-catenin expression in the soluble fraction (p = 0.0016), but not with beta-catenin in the insoluble fraction or with E-cadherin expression. Beta-catenin (-)/cyclin D1 (-) cases displayed less tumor invasion than the remaining cases. However, there were no significant differences in lymph node metastasis or other clinicopathological findings.

CONCLUSION

Our results indicate that beta-catenin overexpression in the cytoplasm may promote malignant transformation by triggering cyclin D1 expression in colorectal cancers.

Antianginal effects of hydroxyfasudil, a Rho-kinase inhibitor, in a canine model of effort angina

1. The effects of Rho-kinase inhibitor, fasudil, and of a more specific Rho-kinase inhibitor, hydroxyfasudil, on pacing-induced myocardial ischaemia were determined in anaesthetized open-chest dogs. 2. The dogs were subjected to left anterior descending coronary artery (LAD) stenosis producing a sufficient ischaemia as measured by ST-segment depression on electrocardiograms only when the hearts were paced 60 beats min(-1) above the baseline. After a recovery (nonpacing) period, drugs or saline were infused intravenously over 30 min. The animals were again subjected to 5 min of pacing 25 min after the initiation of the treatment. 3. Hydroxyfasudil (0.1 and 0.3 mg kg(-1)) and fasudil (0.3 mg kg(-1)) suppressed the ST-segment depression. Hydroxyfasudil and fasudil also increased the regional blood flow of the LAD perfused endomyocardium region in the canine model of effort angina. 4. To determine the flow profile for hydroxyfasudil in dogs, blood flow in three vascular beds was measured. Hydroxyfasudil (0.3 mg kg(-1) for 30 min) significantly increased coronary blood flow and vertebral blood flow, without significantly changing the femoral blood flow. 5. Hydroxyfasudil had no inotropic or chronotropic effect on the isolated hearts of guinea-pigs. Hydroxyfasudil (2 mg kg(-1) for 20 min) did not affect the PR or QTc interval in anaesthetized dogs. 6. Inhibition of Rho-kinase appears to protect myocardium subjected to pacing-induced ischaemia through the increase in the regional myocardial blood flow. Hydroxyfasudil may be categorized as a novel type of anti-anginal drug, without any inotropic or chronotropic effects.