Ecotoxicological effects of the herbicide glyphosate in non-target aquatic species: Transcriptional responses in the mussel Mytilus galloprovincialis

Glyphosate has been the most widely used herbicide worldwide over the last three decades, raising increasing concerns for its potential impacts on environmental and human health. Recent studies revealed that glyphosate occurs in soil, surface water, and groundwater, and residues are found at all levels of the food chain, such as drinking water, plants, animals, and even in humans. While research has demonstrated that glyphosate can induce a broad range of biological effects in exposed organisms, the global molecular mechanisms of action still need to be elucidated, in particular for marine species. In this study, we characterized for the first time the molecular mechanisms of action of glyphosate in a marine bivalve species after exposure to environmentally realistic concentrations. To reach such a goal, Mediterranean mussels Mytilus galloprovincialis, an ecologically and economically relevant species, were exposed for 21 days to 10, 100, and 1000 μg/L and digestive gland transcriptional profiles were investigated through RNA-seq. Differential expression analysis identified a total of 111, 124, and 211 differentially regulated transcripts at glyphosate concentrations of 10, 100, and 1000 μg/L, respectively. Five genes were found consistently differentially expressed at all investigated concentrations, including SERP2, which plays a role in the protection of unfolded target proteins against degradation, the antiapoptotic protein GIMAP5, and MTMR14, which is involved in macroautophagy. Functional analysis of differentially expressed genes reveals the disruption of several key biological processes, such as energy metabolism and Ca2+ homeostasis, cell signalling, and endoplasmic reticulum stress response. Together, the results obtained suggest that the presence of glyphosate in the marine ecosystem should raise particular concern because of its significant effects even at the lowest concentration.

Direct ink writing of silica-bonded calcite scaffolds from preceramic polymers and fillers

Silica-bonded calcite scaffolds have been successfully 3D-printed by direct ink writing, starting from a paste comprising a silicone polymer and calcite powders, calibrated in order to match a SiO₂/CaCO₃ weight balance of 35/65. The scaffolds, fabricated with two slightly different geometries, were first cross-linked at 350 °C, then fired at 600 °C, in air. The low temperature adopted for the conversion of the polymer into amorphous silica, by thermo-oxidative decomposition, prevented the decomposition of calcite. The obtained silica-bonded calcite scaffolds featured open porosity of about 56%-64% and compressive strength of about 2.9-5.5 MPa, depending on the geometry. Dissolution studies in SBF and preliminary cell culture tests, with bone marrow stromal cells, confirmed the in vitro bioactivity of the scaffolds and their biocompatibility. The seeded cells were found to be alive, well anchored and spread on the samples surface. The new silica-calcite composites are expected to be suitable candidates as tissue-engineering 3D scaffolds for regeneration of cancellous bone defects.

Does seawater acidification affect survival, growth and shell integrity in bivalve juveniles?

Anthropogenic emissions of carbon dioxide are leading to decreases in pH and changes in the carbonate chemistry of seawater. Ocean acidification may negatively affect the ability of marine organisms to produce calcareous structures while also influencing their physiological responses and growth. The aim of this study was to evaluate the effects of reduced pH on the survival, growth and shell integrity of juveniles of two marine bivalves from the Northern Adriatic sea: the Mediterranean mussel Mytilus galloprovincialis and the striped venus clam Chamelea gallina. An outdoor flow-through plant was set up and two pH levels (natural seawater pH as a control, pH 7.4 as the treatment) were tested in long-term experiments. Mortality was low throughout the first experiment for both mussels and clams, but a significant increase, which was sensibly higher in clams, was observed at the end of the experiment (6 months). Significant decreases in the live weight (-26%) and, surprisingly, in the shell length (-5%) were observed in treated clams, but not in mussels. In the controls of both species, no shell damage was ever recorded; in the treated mussels and clams, damage proceeded via different modes and to different extents. The severity of shell injuries was maximal in the mussels after just 3 months of exposure to a reduced pH, whereas it progressively increased in clams until the end of the experiment. In shells of both species, the damaged area increased throughout the experiment, peaking at 35% in mussels and 11% in clams. The shell thickness of the treated and control animals significantly decreased after 3 months in clams and after 6 months in mussels. In the second experiment (3 months), only juvenile mussels were exposed to a reduced pH. After 3 months, the mussels at a natural pH level or pH 7.4 did not differ in their survival, shell length or live weight. Conversely, shell damage was clearly visible in the treated mussels from the 1st month onward. Monitoring the chemistry of seawater carbonates always showed aragonite undersaturation at 7.4 pH, whereas calcite undersaturation occurred in only 37% of the measurements. The present study highlighted the contrasting effects of acidification in two bivalve species living in the same region, although not exactly in the same habitat.

[Exposure talc effects on lung function: longitudinal study on variability of respiratory parameters in talc workers]

The study analyzes the variability of respiratory parameters in 59 workers exposed to talc at least 5 years. Cigarettes smoke seems to be the only one variable causing a FEV1 decrease while cumulative exposure doesn't influence any variable analyzed. The talc dust exposure below TLV ACGIH value has not effects on lung function. The function alterations showed are not correlated to task and to cumulative exposure.

[Cervico-thoracic liposarcoma in an HIV patient]

Association between cervico-thoracic liposarcoma and HIV infection is uncommon. The etiopathology remains unclear and clinical symptoms can be various, often not very evident or absolutely absent. Preoperative diagnosis is based on modern imaging techniques. In selected cases, the ideal procedure is surgical treatment which allows good long-term results. A case of cervico-thoracic liposarcoma in HIV patient is presented.

Substernal goiters

BACKGROUND

Substernal goiter, also said cervico-mediastinic goiter, is a thyroid formation with cervical departure that goes beyond, with stretched neck, the superior thoracic strait for at least 3 cm and that preserves, generally, the parenchimal or fibrous connections between the cervical and thoracic portion, maintaining a direct vascularization supplied by the thyroid arteries. The prevalence of this pathology is very variable and fluctuates between 1.7% and 30% of all thyroid damages. The actual classification is provided by the radiologic examination of the chest and, above all, by the new techniques of imaging.

METHODS

In the period between January 1998 and December 2003, 332 patients with thyroid pathology have been treated surgically. Forthy-five (13.5%) of these were afflicted with a cervico-mediastinic goiter. In 32/45 (71.1%) cases a total thyroidectomy has been performed by collar carving in accordance with Kocher; in 11/45 (24.5%) cases an hemithyroidectomy has been performed by collar incision; in 2/45 (4.4%) cases, already submitted to surgical intervention of isthmus-lobectomy a totalization has been performed.

RESULTS

The surgical technique foresees always an anterior collar neck incision. This way of access is to prefer in the substernal goiters, both for the presence of a cervical vascularization easy to control and for the possibility, nearly always realizable, to dislocate the goiter by that way. As for what concerns the results of the histological examination, in 2/45 (4.5%) cases it has been set a diagnosis of follicular carcinoma (one of them surely invading and the other, leastly invading), in 3/45 (6.6%) cases papillary carcinoma, in 4/45 (8.8%) cases colloido-cystic goiter, in 33/45 (73.5%) cases micro-macrofollicular hyperplasia (in one of which contemporarily compromise from lymphoma of Hodgkin); in 3/45 (6.6%) cases of adenomatous hyperplasia of the thyroid.

DISCUSSION

The surgical approach has been in all cases the collar neck incision in accordance to Kocher, and it has never been necessary to associate a sternotomy or thoracotomy. After the intervention, in all the patients the symptomatology tied to the mediastinal compression has disappeared. The goiter showed signs of neoplastic degeneration in 11.1% of the cases, with prevalence of the papillary carcinoma in the 6.6% and, in the remaining 4.5%, of follicular carcinoma. These data are superimposable to the data gathered in other surveys. All the patients passed the post-operating hospitalization in optimal conditions and have been discharged during the fourth post-operating day with the prescription of increasing levothyroxine doses according to the body weigh.

Determination of biogenic amines in fresh and processed meat by suppressed ion chromatography-mass spectrometry using a cation-exchange column

A new method for simultaneous determination of underivatized biogenic amines based on the separation by cation-exchange chromatography and suppressed conductivity coupled with mass spectrometry detection has been developed. The method has been applied to the analysis of cadaverine, putrescine, histamine, agmatine, phenethylamine and spermidine in processed meat products. The amines were extracted from muscle tissue with methanesulfonic acid without any additional derivative step or sample clean-up. Biogenic amines were separated by the IonPac CS17 column, a cation-exchange column used with gradient elution, and detection was done by suppressed conductivity and mass spectrometry. Tyramine was simultaneously analysed by using a spectrophotometer (275 nm) before the suppressed conductivity detection. Linearity of response was obtained in the range 0.25-25 microg mL(-1). The detection limits ranged from 23 microg L(-1) for putrescine to 155 microg L(-1) for spermidine (suppressed conductivity) and from 9 microg L(-1) for agmatine to 34 microg L(-1) for spermidine (MS). Average recoveries from meat samples ranged from 85 to 97% and coefficients of variation ranged from 4.5 to 9.7%. The analysis of biogenic amines in fresh and processed meats (dry-cured, cooked and fermented products) can be used as a quality marker of raw material and for studying the relationship between their changes and the fermentation process involved in dry sausage ripening.

Characterization of dehydroascorbic acid solutions by liquid chromatography/mass spectrometry

The composition of a commercial dehydroascorbic acid (DA) solution at pH 2 was investigated by liquid chromatography/mass spectrometry (LC/MS) and liquid chromatography/tandem mass spectrometry (LC/MS/MS) to establish the nature of its different forms and its decomposition products. In freshly prepared solutions, dimeric forms of DA and the hydrated bicyclic hemiketal of DA are the species mainly present in solution. In the presence of light, the initial dimeric species disappears over time to give other dehydrated dimers some of which decompose to the monomer. The comparison of these data with similar data obtained for ascorbic acid (AA) solutions under the same experimental conditions revealed that, in the presence of light, the aging of such AA solutions gives rise to only the hemiketal form of DA, and that no dimeric species of DA were formed. The presence of the hemiketal form of DA was not revealed by analysis of the same AA solutions using the conventional LC/UV technique. The natural form of DA from the oxidation of AA is the hydrated bicyclic form.

Description and validation of an analytical method for the determination of paromomycin sulfate in medicated animal feeds

A procedure for the extraction of paromomycin from different animal feed matrices (rabbit, chicken, pig feeds) and its subsequent determination via a reversed-phase ion-pair HPLC separation coupled with pulsed amperometric detection is described. The procedure optimised in terms of the extracting solvent and the solid phase extraction stationary phase allows the total recovery of the aminoglycoside antibiotic. The criteria used for the validation of the analytical method applied to the cited matrices are the linear dynamic range of the response, the detection limit, the repeatability, the intermediate repeatability and the accuracy. A comparison with a method described in the literature for the bulk analysis of this antibiotic is made.

Simple and effective gas chromatographic mass spectrometric procedure for the speciation analysis of organotin compounds in specimens of marine mussels. An evaluation of the organotin pollution of the lagoon of venice

This paper describes a simple, effective analytical procedure, based on a gas chromatographic mass spectrometric technique, for the speciation analysis of organotin compounds (OTC) in mussel samples. The direct alkylation reaction of the organotin chlorides in the aqueous digestion solution by NaBEt(4) allowed a short analysis time and a good recovery. The evaluation of the yield of each step constituting the analytical procedure indicated that the alkylation step is the most critical one. The proposed method was advantageously utilised to monitor the level of OTC pollution of the Lagoon of Venice. All the sites examined, both near to and far from anthropogenic activities, revealed significant levels of OTC pollution.

[Echo-guided radiofrequency percutaneous ablation of hepatocellular carcinoma in cirrhosis using a cooled needle]

INTRODUCTION

Radiofrequency hyperthermia using the newly-developed "cooled-tip" needle is one of the latest US-guided percutaneous treatments of hepatocellular carcinoma arising in cirrhosis. The continuous cooling of the needle tip allows tissue heating and necrosis far from the electrode without tissue charring, which was the major drawback of the old monopolar technique. Herein we report our preliminary results on feasibility and effectiveness of the thermoablation of mono- or paucifocal hepatocellular carcinoma with the cooled-tip needle.

MATERIAL AND METHODS

November, 1996, to January, 1998, we treated thirteen cirrhotic patients (mean age 69.5 yrs, 10 men, 12 HCV-positive; 11 in Child's Class A and 2 in Class B) with 19 hepatocellular carcinoma nodules (mean diameter: 27 mm; range: 10-41 mm; 6 with diameter > 3 cm). None of the patients had portal thrombosis and/or extrahepatic spread. We used a radiofrequency generator (100 W power) connected to an 18 G perfusion electrode needle with an exposed tip of 2-3 cm. The circuit is closed through a dispersive electrode positioned under the patient's thighs. A peristaltic pump infuses a chilled (2-5 degrees C) saline solution to guarantee the continuous cooling of the needle tip. The needle was placed into target lesions under US guidance. The interventional procedure was carried out under general anesthesia using Propofol without intubation. Dynamic CT (more recently with the helical technique) was carried out 15-20 days after thermoablation to assess treatment efficacy.

RESULTS

In all, 31 thermal injuries (at 1000-1200 mA for 10-15 minutes) were caused in 21 sessions in the 19 hepatocellular carcinoma nodules (mean: 1.5 lesions per nodule and 1.6 sessions per patient). Complete necrosis as assessed at dynamic CT (no enhancement during the arteriographic phase) was achieved in 16 of 19 nodules (84%). No side-effects occurred. During the follow-up (median: 11 months) no death occurred and five patients had recurrent hepatocellular carcinoma appearing either as single nodule or as multinodular liver involvement.

CONCLUSIONS

In our experience radiofrequency hyperthermia with the cooled-tip needle permits effective and safe percutaneous ablation of HCC in cirrhosis. In addition, treatment time is short and lesions > 3 cm can be treated. Further experience is needed to better define the role of percutaneous thermoablation in the treatment strategy of hepatocellular carcinoma.

Increased frequency of micronucleated kidney cells in rats exposed to halogenated anaesthetics

Six halogenated anaesthetics were tested for their ability to induce micronuclei formation in the rat kidney. A statistically significant increase in the frequency of micronucleated cells was detected in rats given a single p.o. dose of 4 mmol/kg of halothane (3.48 x baseline), chloroform (3.32 x baseline), trichloroethylene (3.24 x baseline), sevoflurane (2.98 x baseline), and isoflurane (2.95 x baseline). In contrast, the response was substantially negative in rats given the same dose of enflurane. As compared to controls, rats treated with halothane and trichloroethylene displayed a reduction in the frequency of binucleated cells presumably due to a toxicity-induced inhibition of cellular proliferation. These findings suggest a potential genotoxic activity of halogenated anaesthetics for the rat kidney.

Relapsing neoplastic seeding after percutaneous ethanol injection for hepatocellular carcinoma. Clinical and ultrasonographic findings in a cirrhotic patient

A case of neoplastic implant after percutaneous ethanol injection (PEI) therapy for hepatocellular carcinoma (HCC) occurring in two steps is described. A 74-year-old male cirrhotic patient underwent PEI for a 5-cm HCC nodule. To obtain complete tumoral necrosis, 80 ml were injected under sonographic guidance in four sessions. Ten months after the completion of PEI a subcutaneous nodule was palpated in the abdominal wall within the area of needle punctures. Histologic examination of the excised nodule confirmed the sonographic and Power Doppler diagnosis of metastatic HCC. At the US exam scheduled three months later a non-palpable subcutaneous nodule of 16 mm was appreciated near the surgical wound. Once again metastatic HCC was demonstrated at pathological examination. Copyright 1997 Elsevier Science Ireland Ltd.

Carcinoid to cecal bowel localization: a case report and literature review

The authors report a case of cecal malignant carcinoid, diagnosticated in a 68 years old male patient. Carcinoid tumours are rare neoplasm and their behaviour seems to change with the localization. Cecal carcinoid represents only 2-3% of gastrointestinal carcinoid. Some times it is discovered incidentally at autopsy, surgery or endoscopy. The aim of this paper has been to review, in literature, the frequency, treatment and prognosis of this neoplasm.

An in vivo micronucleus assay for detecting the clastogenic effect in rat kidney cells

A micronucleus assay in vivo has been developed that is based on the use of freshly isolated kidney cells from mononephrectomized rats. In this validation study, a statistically significant increase in the frequency of micronucleated cells was detected in rats given i.p. a single dose of four kidney carcinogens, N-nitrosodimethylamine, N-nitrosodiethylamine, N-ethyl-N-hydroxyethylnitrosamine and N-nitroso-N-methylurea. The clastogenic effect was more marked when the same dose was injected for 3 successive days. As compared to controls, treated rats displayed a reduction in the frequency of binucleated cells, presumably due to a toxicity-induced inhibition of cellular proliferation. The proposed method should be suitable for the detection of the clastogenic effect of procarcinogens biotransformed into reactive species in the kidney.

Efflux of dopamine from the synaptic cleft in the nucleus accumbens of the rat brain

Synaptic release of dopamine in the nucleus accumbens of the intact rat brain elicited by a single electrical impulse applied to ascending dopaminergic fibers results in extracellular concentrations sufficient to bind the known dopamine receptors. The dopamine concentration observed after four rapid, sequential pulses is exactly four times greater and is unaffected by pharmacological antagonism of dopamine uptake and receptor sites at supramaximal concentrations. Thus, dopamine efflux from the synaptic cleft is not restricted by binding to intrasynaptic proteins on the time scale of the measurements (50-100 msec). The extracellular concentration, as a result of a single stimulus pulse, is 0.25 microM and is rapidly removed by extrasynaptic uptake. This maximal, transient concentration of dopamine is 60 times higher than steady-state concentrations reported previously using dialysis techniques, illustrating that dopamine extracellular concentrations are spatially and temporally heterogenous. In contrast to ACh transmission at the neuromuscular junction, the dopamine synapse in the telencephalon is designed for the effective efflux of dopamine from the synaptic cleft to the extrasynaptic compartment during neurotransmission.

Cost savings as an indicator of successful nursing intervention

The purpose of this study was to provide cost-related data from an intervention study in the care of patients with peripheral vascular disease (PVD). In a previously reported study, the study group patients increased exercise more than control patients, but there were no differences on any other health promoting behaviors or clinical outcomes. However, analysis of the differences between the study (N = 44) and the control patients (N = 42) on costs for health care during the course of the study demonstrated substantial differences. A fixed per diem rate was used to determine inpatient and outpatient costs. Study patients required significantly fewer PVD-related hospitalization and health care costs than control patients but not on vascular-related and nonvascular-related illnesses. Since there were no differences between the study and control on non-PVD illnesses, it appears that the intervention targeted to influence PVD problems did so. Limitations to the study are identified and additional research in this area is warranted.

Twenty-five years' experience treating cerebro-rhino-orbital mucormycosis

Mucormycosis is an acute fungal disease with high mortality exhibiting craniofacial, pulmonary, cutaneous, gastrointestinal and disseminated forms. Cerebro-rhino-orbital (CRO) mucormycosis is the type that most frequently involves the structures of the head and neck. While usually non-pathogenic, these saprophytic organisms can be particularly lethal in chronically debilitated patients. Between the years 1957 and 1982, 18 cases of CRO mucormycosis were seen at the Medical College of Virginia Hospital and the McGuire VA Medical Center. Four illustrative cases of CRO mucormycosis are presented to emphasize: the importance of clinical awareness of the disease, the necessity of tissue biopsy for diagnosis, the need of appropriate management of any underlying disorder, administration of amphotericin-B, and the performance of adequate surgery.

Effectiveness of health promotion interventions

The purpose of the study was to determine whether patients who participated in an intervention program would improve exercise and foot-care habits, reduce smoking, and would, in turn, have fewer PVD-related illnesses than patients not exposed to the intervention. Eighty-six patients with ankle/brachial pressure indices of less than 1.0 on one or both legs were randomly assigned to a study (N = 42) or control (N = 44) group. All patients were assessed on a variety of health-related and activity behaviors prior to and again 26 weeks after enrollment in the study. Study patients who participated in the intervention worked with professionals on selecting programs designed to modify and improve their smoking, exercise, and/or foot-care habits. At the end of 26 weeks, chi-square analysis showed no significant differences between study and control groups on change in smoking and foot care, although the results were in the anticipated direction. Study patients who chose to increase their exercise showed greater increase than control patients in frequency (p = .001), distance (p = .007), and length (p = .002) of walks. Although behaviors were modified, especially in the area of exercise, it was felt that longer interventions on a larger sample size are needed.

Arginine thiazolidinecarboxylate in the treatment of chronic active hepatitis: double-blind comparison with placebo

Forty-four patients with chronic active hepatitis were given arginine thiazolidinecarboxylate (800 mg/day per os for 40 days) or placebo in a randomized, double-blind trial. The most important liver function parameters were measured in each patient at the beginning of the trial, after 20 days, and at the end of the trial. The active drug lessened the parameters of necrosis and cholestasis while protein synthesis improved in liver cells. The differences between ATCA and placebo groups were highly significant. No treatment-related side-effects were reported.

Acute histopathologic inner ear changes in deafness due to neomycin: a case report

A case presentation of a patient receiving 8 gm of neomycin intramuscularly in preparation for surgery is presented. Acute renal failure and total deafness followed this injection and the temporal bones were removed on the seventeenth day postinjection. Histological findings showed inner and outer hair cell degeneration and a normal spiral ganglion count. There were some changes in the stria vascularis which were noted in the basal turn.