Expression and Prognostic Relevance of GAGE1 and XAGE1 Cancer/Testis Antigens in Head and Neck Squamous Cell Carcinoma.

BACKGROUND: In the last decades, survival rates in head and neck squamous cell carcinoma (HNSCC) have not changed, with a five-year survival of only 50%. Thus, there is a great need for the identification of new molecular targets and development of novel therapeutic strategies. Cancer-testis antigens (CTAs) are expressed in various types of tumor but rarely in healthy normal tissues. Therefore, they appear as ideal targets for immunotherapy approaches, as well as, unique markers for cancer diagnosis/prognosis. OBJECTIVE: This study evaluated the expression pattern of cancer/testis antigens (CTA) in HNSCC samples and correlated the expression data with the clinicopathological prognostic variables. METHODS: An in silico screening was performed using all CTA genes cataloged on the CTDatabase and the expression of the eight CTA genes (ARMC3, DDX53, FTHL17, GAGE1, MAGEA11, SYCE1, TCP11, and XAGE1) was examined in 89 HNSCC and 20 normal mucosa samples using RT-PCR analysis. RESULTS: GAGE1 (48.3%), XAGE1 (40.4%) and MAGEA11 (19.1%) were frequently and specifically expressed in HNSCC samples and 68.5% of the cases expressed at least one of these antigens. Moreover, GAGE1 and XAGE1 mRNA positivity was significantly associated with the presence of metastasis in the lymph nodes (p=0.038 and p=0.023, respectively) and, by multivariate analysis, male gender (p=0.032), advanced clinical stage (p=0.018) and mRNA positivity for GAGE1 (p=0.010) were independent prognostic factors for overall survival. CONCLUSION: These findings suggest GAGE1 and XAGE1 expressions to be useful as prognostic markers for HNSCC.

Neurophysiological assessment of sympathetic cardiovascular activity after loss of postganglionic neurons in the anesthetized rat.

The goal of this study was to determine the degree of sympathetic postganglionic neuronal loss required to impair cardiovascular-related sympathetic activity. To produce neuronal loss separate groups of rats were treated daily with guanethidine for either 5days or 11days, followed by a recovery period. Sympathetic activity was measured by renal sympathetic nerve activity (RSNA). Stereology of thoracic (T13) ganglia was performed to determine neuronal loss. Despite loss of more than two thirds of neurons in T13 ganglia in both treated groups no effect on resting blood pressure (BP) or heart rate (HR) was detected. Basal RSNA in rats treated for 5days (0.61±0.10µV∗s) and 11days (0.37±0.08µV∗s) was significantly less than vehicle-treated rats (0.99±0.13µV∗s, p<0.05). Increases in RSNA by baroreceptor unloading were significantly lower in 5-day (1.09±0.19µV∗s) and 11-day treated rats (0.59±0.11µV∗s) compared with vehicle-treated rats (1.82±0.19µV∗s, p<0.05). Increases in RSNA to chemoreceptor stimulation were significantly lower in 5-day treated rats (1.54±0.25µV∗s) compared with vehicle-treated rats (2.69±0.23µV∗s, p<0.05). Increases in RSNA in 11-day treated rats were significantly lower (0.75±0.15µV∗s, p<0.05) compared with both vehicle-treated and 5-day treated rats. A positive correlation of neurons to sympathetic responsiveness but not basal activity was detected. These data suggest that diminished capacity for reflex sympathetic responsiveness rather than basal activity alone must be assessed for complete detection of neurophysiological cardiovascular impairment.

Latent carcinogenicity of early-life exposure to dichloroacetic acid in mice.

Environmental exposures occurring early in life may have an important influence on cancer risk later in life. Here, we investigated carryover effects of dichloroacetic acid (DCA), a small molecule analog of pyruvate with metabolic programming properties, on age-related incidence of liver cancer. The study followed a stop-exposure/promotion design in which 4-week-old male and female B6C3F1 mice received the following treatments: deionized water alone (dH2O, control); dH2O with 0.06% phenobarbital (PB), a mouse liver tumor promoter; or DCA (1.0, 2.0 or 3.5g/l) for 10 weeks followed by dH2O or PB (n = 20-30/group/sex). Pathology and molecular assessments were performed at 98 weeks of age. In the absence of PB, early-life exposure to DCA increased the incidence and number of hepatocellular tumors in male and female mice compared with controls. Significant dose trends were observed in both sexes. At the high dose level, 10 weeks of prior DCA treatment induced comparable effects (≥85% tumor incidence and number) to those seen after continuous lifetime exposure. Prior DCA treatment did not enhance or inhibit the carcinogenic effects of PB, induce persistent liver cytotoxicity or preneoplastic changes on histopathology or alter DNA sequence variant profiles within liver tumors compared with controls. Distinct changes in liver messenger RNA and micro RNA profiles associated with prior DCA treatment were not apparent at 98 weeks. Our findings demonstrate that early-life exposure to DCA may be as carcinogenic as life-long exposures, potentially via epigenetic-mediated effects related to cellular metabolism.

PF-03882845, a non-steroidal mineralocorticoid receptor antagonist, prevents renal injury with reduced risk of hyperkalemia in an animal model of nephropathy.

The mineralocorticoid receptor (MR) antagonists PF-03882845 and eplerenone were evaluated for renal protection against aldosterone-mediated renal disease in uninephrectomized Sprague-Dawley (SD) rats maintained on a high salt diet and receiving aldosterone by osmotic mini-pump for 27 days. Serum K(+) and the urinary albumin to creatinine ratio (UACR) were assessed following 14 and 27 days of treatment. Aldosterone induced renal fibrosis as evidenced by increases in UACR, collagen IV staining in kidney cortex, and expression of pro-fibrotic genes relative to sham-operated controls not receiving aldosterone. While both PF-03882845 and eplerenone elevated serum K(+) levels with similar potencies, PF-03882845 was more potent than eplerenone in suppressing the rise in UACR. PF-03882845 prevented the increase in collagen IV staining at 5, 15 and 50 mg/kg BID while eplerenone was effective only at the highest dose tested (450 mg/kg BID). All doses of PF-03882845 suppressed aldosterone-induced increases in collagen IV, transforming growth factor-ß 1 (Tgf-ß 1), interleukin-6 (Il-6), intermolecular adhesion molecule-1 (Icam-1) and osteopontin gene expression in kidney while eplerenone was only effective at the highest dose. The therapeutic index (TI), calculated as the ratio of the EC50 for increasing serum K(+) to the EC50 for UACR lowering, was 83.8 for PF-03882845 and 1.47 for eplerenone. Thus, the TI of PF-03882845 against hyperkalemia was 57-fold superior to that of eplerenone indicating that PF-03882845 may present significantly less risk for hyperkalemia compared to eplerenone.

Mutagenicity and cytotoxicity assessment in patients undergoing orthodontic radiographs.

OBJECTIVES: The aim of the present study was to evaluate DNA damage (micronucleus) and cellular death (pyknosis, karyolysis and karyorrhexis) in exfoliated buccal mucosa cells from individuals following radiography. METHODS: Lateral and frontal cephalometric X-ray and panoramic dental X-rays were taken of a total of 18 healthy patients (6 male and 12 female) referred for orthodontic therapy. Exfoliated oral mucosa cells were collected immediately before X-ray exposure and after 10 days. RESULTS: The results revealed no statistically significant difference (P > 0.05) in the frequency micronucleated oral mucosa cells after X-ray exposure. However, X-ray was able to increase other nuclear alterations closely related to cytotoxicity, such as karyorrhexis, pyknosis and karyolysis. CONCLUSIONS: Data indicated that exposure to certain radiography may not be a factor in inducing chromosomal damage, but it does promote cytotoxicity.

Biomonitoring of DNA damage and cytotoxicity in individuals exposed to cone beam computed tomography.

OBJECTIVES: The aim of the present study was to evaluate DNA damage (micronucleus) and cellular death (pyknosis, karyolysis and karyorrhexis) in exfoliated buccal mucosa cells from adults following cone beam CT exposure. METHODS: A total of 19 healthy adults (10 men and 9 women) submitted to cone beam CT were included. RESULTS: No significant statistically differences (P > 0.05) in micronucleus frequency were seen before and after cone beam CT exposure. In contrast, the tomography was able to increase other nuclear alterations closely related to cytotoxicity such as karyorrhexis, pyknosis and karyolysis (P < 0.05). CONCLUSION: In summary, these data indicate that cone beam CT may not be a factor that induces chromosomal damage, but it is able to promote cytotoxicity.

Radiopacifiers do not induce genetic damage in murine fibroblasts: an in vitro study.

AIM: To evaluate whether several radiopacifiers are able to induce genetic damage in a laboratory cell culture study. METHODOLOGY: Murine fibroblasts were exposed to barium sulphate, bismuth oxide or zirconium oxide, at final concentrations ranging from 10 to 1000 microg mL(-1) for 1 h at 37 degrees C. The negative control group was treated with a vehicle control [phosphate buffered solution (PBS)] for 1 h at 37 degrees C and the positive control group was treated with hydrogen peroxide (at 10 microM) for 5 min on ice. Genotoxicity data were assessed by the single-cell gel (comet) assay. RESULTS: All the tested compounds did not induce DNA breakage as depicted by the mean tail moment in all the concentrations analysed. CONCLUSION: Exposure to the tested radiopacifiers may not be a factor that increases the level of DNA lesions in mammalian cells as detected by a single-cell gel (comet) assay.

Effects of alpha- and beta-hydroxy acids on the edemal response induced in female SKH-1 mice by simulated solar light.

alpha- and beta-Hydroxy acids have been used extensively in cosmetic and dermatological formulations. At present, there is an inadequate amount of information with which to assess the safety of topical applications of alpha- and beta-hydroxy acids in conjunction with exposure to ultraviolet light. In the present study, we examined changes in the epidermal basal cell proliferation and the edemal response using skin thickness measurements elicited in SKH-1 mice following exposure to simulated solar light (SSL) with or without topical treatment with creams containing alpha- (glycolic) and beta-hydroxy (salicylic) acids. The dose of SSL light required to induce measurable edema (MED(BIOL)) in nai;ve, free-moving SKH-1 mice was determined to be 90 mJ. CIE/cm(2). Pretreating the mice with daily (5 days/week) exposures of 14 mJ. CIE/cm(2) for 6 weeks resulted in a doubling of the MED(BIOL) to 180 mJ. CIE/cm(2). Topical application of control cream (pH 3.5), or creams containing glycolic acid (10%, pH 3.5) or salicylic acid (4%, pH 3.5) for 6 weeks (5 days/week) increased the MED(BIOL) to 137 mJ. CIE/cm(2). Daily treatments with SSL (14 mJ. CIE/cm(2)) and control cream (pH 3.5), glycolic (10%, pH 3.5) or salicylic (4%, pH 3.5) acid-containing creams for 6 weeks (5 days/week) resulted in an MED(BIOL) value of 180 mJ. CIE/cm(2), which was the same as treatment with light alone for 6 weeks. These data indicate that a 6-week treatment of mouse skin with a representative skin cream, with or without representative alpha- and beta-hydroxy acids (glycolic and salicylic acid, respectively), changes the UV light sensitivity; however, treatment with the cream, with or without the acids, does not contribute to the UV sensitivity of mice cotreated with low doses of UV light.

Comparison of the toxicity of several fumonisin derivatives in a 28-day feeding study with female B6C3F(1) mice.

Fumonisinmycotoxins are produced by Fusaria fungi that grow worldwide primarily on corn. Fumonisin B(1), the most predominant form in corn samples, is a renal carcinogen in male F344/N rats and a hepatocarcinogen in female B6C3F(1) mice when fed at concentrations higher than 50 ppm (70 micromol/kg) in the diet for 2 years. We sought to determine the relative toxicities of several naturally occurring fumonisin derivatives when included in the diet of female B6C3F(1) mice. Mice were fed diets containing fumonisin B(1), fumonisin B(2), fumonisin B(3), fumonisin P1, hydrolyzed-fumonisin B(1), N-(acetyl)fumonisin B(1), or N-(carboxymethyl)fumonisin B(1) (approximately 0, 14, 70, and 140 micromol/kg diet) for 28 days. None of the doses used caused a decrease in body weight gain over the 28 days. Serum levels of total bile acids, cholesterol, and alkaline phosphatase were increased only in mice receiving 72 and 143 micromol/kg fumonisin B(1), suggesting that only fumonisin B(1) was hepatotoxic in the mice. Corroborating this observation, the liver weight, relative to body weight, was decreased only in the mice that consumed 143 micromol/kg fumonisin B(1). Consistent with fumonisin B(1) inhibition of ceramide synthase, the liver sphinganine-to-sphingosine ratio was increased and the liver ceramide levels were decreased only in the mice receiving 72 and 143 micromol/kg fumonisin B(1). Increased hepatocellular apoptosis, hepatocellular hypertrophy, Kupffer cell hyperplasia, and macrophage pigmentation were detected in the mice consuming 72 and 143 micromol/kg fumonisin B(1). The other fumonisin derivatives did not alter serum analytes, organ weights, or hepatic structure. These results suggest that, of the naturally occurring fumonisins, fumonisin B(1) is the principal hepatotoxic derivative in the B6C3F(1) mouse.

Day case surgery in otolaryngology: a 10-year analysis.

This paper analyses the ENT day case surgery performed over the period May 1974 to May 1984 in Cardiff. The patients undergoing such surgery, the types of surgery, forms of anaesthesia, travelling considerations, seasonal variation and admission rate are examined. The problems of list organization, patient selection and attendance are examined in detail in a 12-month period from May 1981 to May 1982.