Infective endocarditis caused by Capnocytophaga canimorsus; a case report.

BACKGROUND: Capnocytophaga canimorsus is a gram-negative bacterium and an oral commensal in dogs and cats, but occasionally causes serious infections in humans. Septicemia is one of the most fulminant forms, but diagnosis of C. canimorsus infection is often difficult mainly because of its very slow growth. C. canimorsus infective endocarditis (IE) is rare and is poorly understood. Since quite a few strains produce ß-lactamase, antimicrobial susceptibility is pivotal information for adequate treatment. We herein report a case with C. canimorsus IE and the results of drug susceptibility test. CASE PRESENTATION: A 46-year-old man had a dog bite in his left hand 3 months previously. The patient was referred to our hospital for fever (body temperature > 38 °C), visual disturbance, and dyspnea. Echocardiography showed aortic valve regurgitation and vegetation on the leaflets. IE was diagnosed, and we initially administered cefazolin and gentamycin assuming frequently encountered microorganisms and the patient underwent aortic valve replacement. C. canimorsus was detected in the aortic valve lesion and blood cultures. It was also identified by 16S ribosome DNA sequencing. Ceftriaxone were started and continued because disk diffusion test revealed the isolate was negative for ß-lactamase and this case had cerebral symptoms. The patient successfully completed antibiotic treatment following surgery. CONCLUSIONS: We diagnosed C. canimorsus sepsis and IE by extended-period blood cultures and 16S ribosome DNA sequencing by polymerase chain reaction, and successfully identified its drug susceptibility.

[Trend of susceptibility testing of clinical isolates of Candida species from aseptic samples in hospitals in Saitama prefecture].

We investigated the susceptibility of Candida species from clinical aseptic samples, including blood, at some hospitals in Saitama prefecture. Candida spp. detected from aseptic samples in the 6 institutes in Saitama prefecture from November 2007 to July 2011 were studied. The number of isolates was 85, which are 43 (50.6%) of Candida albicans, 24 (28.2%) of Candida parapsilosis, 5 (5.9%) of Candida glabrata, 5 (5.9%) of Candida tropicalis, 4 (4.7%) of Candida guilliermondii, 2 (2.4%) of Candida fermentati, 1 (1.2%) of Candida famata and Candida lusitaniae, respectively. All isolates were susceptible to amphotericin B. However, resistant isolates against micafungin were 3 in 5 of C. glabrata. We analyzed susceptibility of Candida spp. in Saitama prefecture in the article, and our study might be useful for the fungal therapy in the region.

The anti-overactive bladder activity of KW-7158 is mediated by blocking equilibrative nucleoside transporter-1.

KW-7158 is a novel therapeutic candidate for treating overactive bladder (OAB) with a unique mode of action: suppression of sensory afferent nerves. However, the molecular target of this compound remains unknown. We herein report the identification of the KW-7158 target to be equilibrative nucleoside transporter-1 (ENT1). A membrane protein expression library of ca. 7000 genes was expressed in a dorsal root ganglion cell line, which we had previously generated, and subjected to screening for binding with a fluorescent derivative that retains high binding activity to the target. The screening revealed that only cells transfected with an ENT1 expression vector exhibited significant binding. We next performed [(3)H]KW-7158 binding experiments and an adenosine influx assay and found that KW-7158 binds to and inhibits ENT1. To further demonstrate the pharmacological relevance, we evaluated other known ENT1 inhibitors (nitrobenzylthioinosine, dipyridamole, draflazine) in an in vitro bladder strip contraction assay and the rat spinal cord injury OAB model. We found that all of the inhibitors exhibited anti-OAB activities, of which the potencies were comparable to that of adenosine influx inhibition in vitro. These studies demonstrated that the pharmacological target of KW-7158 is ENT1, at least in the rat OAB model. Our results will aid understanding of the precise mechanism of action of this drug and may also shed new light on the use of the adenosine pathway for the treatment of OAB.

Flare hypercalcemia after letrozole in a patient with liver metastasis from breast cancer: a case report.

INTRODUCTION: Tamoxifen may occasionally precipitate serious and potentially life-threatening hypercalcemia. However, to date, this has not been documented with aromatase inhibitors. CASE PRESENTATION: A 65-year-old Japanese woman with liver metastasis from breast cancer was admitted to our hospital with vomiting, anorexia, fatigue, arthralgia, muscle pain and dehydration. She had started a course of letrozole five weeks earlier. Our patient's calcium level was 11.6 mg/dL. She was rehydrated and elcatonin was administered. Our patient's parathyroid hormone and parathyroid hormone-related protein levels were not increased and a bone scintigram revealed no evidence of skeletal metastasis. After our patient's serum calcium level returned to within the normal range, letrozole was restarted at one-half of the previous dose (1.25 mg). There were no episodes of hypercalcemia. However, 84 days after restarting letrozole, our patient again complained of arthralgia and treatment was changed to toremifene. During these periods, repeated ultrasonograms revealed no progression of liver metastasis. CONCLUSION: To the best of our knowledge, this is the first case report of flare hypercalcemia after treatment with letrozole in a patient with metastatic breast cancer.

[Predictors of axillary node metastasis at breast surgery after neoadjuvant chemotherapy in patients with pre- chemotherapy-sentinel node positive breast cancer].

BACKGROUND: We investigated predictors for axillary node metastasis at breast surgery after neoadjuvant chemotherapy (NAC) in patients with pre-chemotherapy-sentinel node positive breast cancer. METHODS: Eighty-two patients were diagnosed as having positive sentinel lymph node (SLN), who had axillary lymph node dissection (ALND) performed after combination anthracycline/taxan based NAC, between 2002 and 2009. RESULTS: Eighteen (22.0%) of the 82 patients had residual axillary metastases after NAC. Multivariate analysis revealed that SLNs status before NAC was an important factor in predicting residual axillary metastases. Predictors of residual nodal disease were the number of macrometastases and the percentage (>50%) of positive SLNs in all SLNs. Among a subgroup of hormone-receptor positive and HER2-negative tumors, the risk of residual nodal metastases were high sensitivity of hormone receptor, with more than 50% of tumor cells staining positive for ER and PgR. CONCLUSION: Patients with two or more positive SLNs before NAC had a high risk of residual nodal metastasis after NAC.

Clinicopathological analysis of ten patients with metaplastic squamous cell carcinoma of the breast.

PURPOSE: Primary squamous cell carcinoma (SCC) and metaplastic squamous cell carcinoma (MSCC) are rare types of breast cancer with specific histological features. They are characterized by rapid progression, a tendency toward cyst formation, and negativity for hormone receptors. Many studies have concluded that SCC of the breast carries a poor prognosis, based on the fact that conventional chemotherapy for ductal carcinoma of the breast is ineffective against SCC. This is a retrospective study of patients in a single center with SCC or MSCC. METHODS: We searched the records of the Tokyo Metropolitan Komagome Hospital for patients diagnosed with breast SCC or MSCC between 1979 and 2006. Squamous cell carcinoma was diagnosed when 100% of the malignant cells showed a squamous component (pure SCC) and MSCC was diagnosed when more than 50% of the malignant cells showed a squamous component. We analyzed the clinicopathological features, treatment methods, and outcomes of these patients. RESULTS: We identified 10 (0.28%) patients with SCC or MSCC from among 3565 patients with malignant breast tumors treated at our hospital during this period. Nine patients had adenocarcinoma with squamous metaplasia, and one had pure SCC. Ultrasound showed a central cystic-necrotic component in seven tumors, and all of the tumors were negative for hormone receptors and HER2. Recurrence developed in two patients with lymph node metastasis, but not in the other eight patients. The 5-year survival rate and median survival time were 85.7% and 97 months, respectively. CONCLUSIONS: Squamous cell carcinoma or MSCC of the breast with features of the triple-negative subtype seems to be associated with a poor prognosis; however, nodenegative patients are likely to have a favorable prognosis.

A low number of tumor-infiltrating FOXP3-positive cells during primary systemic chemotherapy correlates with favorable anti-tumor response in patients with breast cancer.

Cancer cells induce proliferation and local accumulation of immunosuppressive cells, such as FOXP3-positive cells known as regulatory T cells (Tregs), leading to tumor-induced immune tolerance. Although cancer chemotherapy is usually considered immunosuppressive, some chemotherapeutic agents activate an anticancer immune response. Therefore, we postulated that the number of tumor-infiltrating FOXP3-positive cells during primary systemic chemotherapy (PSC) correlates with therapeutic outcomes in patients with breast cancer. Between September 2000 and January 2005, we examined 93 patients with breast cancer diagnosed by core-needle biopsy and treated with PSC. Core-needle biopsy (CNB) and surgical resected specimens were stained with a FOXP3 mouse monoclonal antibody to compare the numbers of FOXP3-positive cells in the tumors before and after PSC. A median cut-off value of >16.3/high power field (HPF) and >6.6/HPF defined high numbers of Tregs in CNB and in surgical specimens, respectively. We then assigned the patients into 4 groups (HH, high number of FOXP3-positive cells in both CNB and surgical specimen; LL, low number in both specimens; HL, high in CNB and low in the surgical specimen; LH, low in CNB and high in surgical specimen). Lymph vessel invasion-positive, clinically non-responder and ER-negative tumors contained significantly more FOXP3-positive cells after PSC (p=0.04, p=0.03 and p=0.04, respectively). Prognosis was better among patients with low numbers than high numbers of FOXP3-positive cells both in CNB and in surgically resected specimens. In multivariate analysis, LL group demonstrated significantly better recurrence-free survival with risk ratio of 5.81 (95%CI, 1.09-107.5; p=0.04) rather than that of non-LL group (LH, HL and HH). These findings suggest that the number of FOXP3-positive cells identified during PSC represents a promising predictive factor that might also be an important therapeutic target for breast cancer.

Irinotecan-induced apoptosis is inhibited by increased P-glycoprotein expression and decreased p53 in human hepatocellular carcinoma cells.

Irinotecan, a DNA topoisomerase I inhibitor, is widely used in cancer chemotherapy. However, little is known of the mechanisms of its antitumor effects and the development of drug resistance in human hepatocellular carcinoma (HCC). In this study, we investigated the effects of short-term culture with SN-38, the active metabolite of irinotecan, on apoptosis in Huh7 cells. The cells were cultured with SN-38 for 24, 72, and 120 h, and apoptosis was determined using the terminal dUTP nick-end labeling (TUNEL) assay. The expressions of p53, apoptosis-related proteins, and P-glycoprotein (P-gp), a protein conferring the multidrug-resistant phenotype, were analyzed using Western blotting. Induced expression of P-gp was detected using fluorescence microscopy. SN-38 significantly induced apoptosis in Huh7 cells at 24 h. SN-38 also increased the expression of p53, Bax, and caspase-9 and decreased Bcl-xL expression in Huh7 cells. SN-38 decreased p53 expression and increased P-gp expression after 120 h, resulting in inhibition of apoptosis. This inhibition was reversed by the addition of verapamil to the culture medium during 120 h incubation. SN-38-induced P-gp expression was additionally enhanced by p53 decoy oligodeoxynucleotide. The changes in P-gp expression were directly moderated by p53 gene downregulation, suggesting that it plays a role in the mechanism of drug resistance. These results suggest that the accumulation of irinotecan in HCC leads to the development of drug resistance.

Orange juice increased the bioavailability of pravastatin, 3-hydroxy-3-methylglutaryl CoA reductase inhibitor, in rats and healthy human subjects.

Our objective was to investigate the effects of orange juice on the pharmacokinetics of pravastatin in rats and healthy volunteers. The pharmacokinetics of pravastatin (100 mg/kg p.o.) were assessed with water, orange juice, and carbohydrates (12.5 ml/kg over 30 min) and with acetic acid (0.1 M, pH 3.44). The pharmacokinetics of simvastatin (100 mg/kg p.o.) were assessed with water and orange juice. In addition, the pharmacokinetics (based on plasma levels) of pravastatin 80 mg/kg i.v. were assessed with water and orange juice (5 ml/kg) in rats. The pharmacokinetics of oral pravastatin (10 mg) were assessed when administered with water and orange juice (800 ml over 3 h) in a two-way crossover study in 14 healthy volunteers. Orange juice significantly increased the area under the curve (0-150 min) of pravastatin in rats. Orange juice had no effects on the pharmacokinetic parameters of intravenously administered pravastatin in rats. Carbohydrates and acetic acid with pH and concentration equivalent to those of orange juice also resulted in no statistically significant differences in pravastatin pharmacokinetic parameters in rats. Orange juice did not result in any significant differences in the pharmacokinetic parameters of simvastatin in rats. Orange juice significantly increased oatp1 and oatp2 mRNA and protein in the intestine of rats. Orange juice significantly increased the area under the curve (0-240 min) of pravastatin in healthy volunteers. In conclusion, orange juice increases the bioavailability of pravastatin administered orally. Oatp1 and oatp2 may be related to increases of pharmacokinetics of pravastatin by orange juice.

Anti-lipid deposition effect of HMG-CoA reductase inhibitor, pitavastatin, in a rat model of hypertension and hypercholesterolemia.

Since the rat is an atherosclerosis-resistant species, the study of atherosclerosis using rats is limited. The present study was undertaken to develop an atherosclerotic model in rats, to investigate the effect of nitric oxide (NO) inactivation and hyperlipidemia, and to evaluate the effect of pitavastatin, a 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoA reductase) inhibitor, on NO inactivation and on hyperlipidemia-induced changes in the cardiovascular system. Four-month-old male spontaneously hypertensive hyperlipidemic rats (SHHR) and Sprague-Dawley (SD) rats were used to study 1) the effect of the period of treatment with N(G)-nitro-L-arginine methyl ester (L-NAME, 100 mg/L) on high fat diet (HFD)-treated SHHR and SD rats, and 2) the effect of pitavastatin (Pit, 0.3 mg/kg/day) on the changes in the aorta of L-NAME- and HFD-treated SHHR and SD rats. L-NAME administration for 1 month then HFD feeding for 2 months markedly increased the deposition of lipids and the thickness of the endothelium in SHHR. Continuous L-NAME treatment with HFD produced severe injury and stripped of endothelium in both strains. The plasma total cholesterol of L-NAME + HFD-treated and L-NAME + HFD + Pit-treated SHHR was significantly higher than that of control SHHR. Lipid deposition, however, was comparatively less in the aorta of L-NAME + HFD + Pit-treated SHHR. The concentration of cholesterol in the aorta of control SHHR was significantly lower than that in the aorta of L-NAME + HFD-treated SHHR, whereas that of L-NAME + HFD + Pit-treated SHHR was the same as that in control SHHR. These data indicated that Pit blocked lipid deposition in the aorta of L-NAME + HFD treated SHHR without changing plasma lipid profiles. In conclusion, NO inactivation and HFD induce lipid deposition in the endothelium, and the HMG-CoA reductase inhibitor blocks the deposition in SHHR.

Distribution of adenosine A(2A) receptor antagonist KW-6002 and its effect on gene expression in the rat brain.

A novel adenosine A(2A) receptor selective antagonist, KW-6002 [(E)-1,3-diethyl-8-(3,4-dimethoxystyryl)-7-methyl-3,7-dihydro-1H-purine-2,6-dione], possesses antiparkinsonian activities in rodent and primate models. In the present study, we investigated the distribution of [14C]KW-6002 in forebrain after oral administration at pharmacologically effective doses. Also, we monitored the effects of the compound on preproenkephalin (PPE) and preprotachykinin (PPT) gene expression in rat striatum. The highest level of radioactivity was observed in the striatum after oral administration of [14C]KW-6002; 30 min after 0.1 and 0.3 mg/kg, the density values in the striatum were 2.45 and 2.43 times higher than those in a reference region (frontal cortex), respectively. At the dose of 3 mg/kg, p.o., the ratio was only 1.58 and the compound was distributed more extensively in the brain. The distribution pattern and intensity of radioactivity were maintained even 90 min after the administration of [14C]KW-6002. Oral administration of KW-6002 (0.3 and 3 mg/kg/day) to rats for 14 days reversed the increased gene expression of PPE in striatum that had been depleted of dopamine by prior treatment with 6-hydroxydopamine (6-OHDA). On the other hand, KW-6002 did not alter the decreased gene expression of PPT in 6-OHDA-treated rats. These results are the first to show directly that orally administered KW-6002 is distributed selectively to the striatum and that it modulates the activity of striatopallidal enkephalin-containing neurons but not striatonigral substance P-containing neurons.