Profile of Children With Child Abuse From Serbia.

OBJECTIVE: To study the demographic and clinical profile of children with suspected physical or sexual abuse. METHODS: Retrospective records of children who were admitted to hospital between January, 2015 to December, 2020 with suspected physical or sexual abuse were evaluated. RESULTS: The records of 52 children [mean (SD) age 12.24 (5.32) y, 39 boys] were retrieved. Contusions were the most common injury in 53.8% of boys and 69.2% of girls. The majority (70%) of 8-18 year-old-children were abused by peers, and parents/caregivers were the main perpetrators in 72.7% of younger children. CONCLUSION: Child abuse is often underreported, and requires a high index of suspicion and multidisciplinary approach of management.

The electrophysiological effects of cadmium on Retzius nerve cells of the leech Haemopis sanguisuga.

Cadmium is considered one of the most toxic heavy metals which can cause cytotoxicity in multiple organs including the brain. Despite many studies over the past decades, the cellular and molecular mechanisms underlying its neurotoxicity remain unclear. The present study was designed to examine the acute effects of cadmium chloride (CdCl2) on the electrical activity of the Retzius nerve cells of leech Haemopis sanguisuga using electrophysiological techniques. CdCl2, in concentrations of 10-100 µM, produced a dose- and time-dependent depolarization of Retzius neurons, paralleled by an increase in firing frequency and action potential duration. To examine potential mechanisms, we studied the effects of cadmium on the outward potassium current upon depolarization using a point microelectrode voltage-clamp technique. Reduction of the fast, and partial inhibition of the slow outward current were observed after adding 50 and 100 µM CdCl2 in the external fluid. The present results support the view that the effect of cadmium on the outward potassium channel may be a potential contributing mechanism for cadmium-induced neurotoxic damage. The proposed mechanism of cadmium action on the electrical properties of leech Retzius neurons might have broader significance concerning not only the leeches but vertebrate brains as well.

Effect of long-term drought on tomato leaves: the impact on metabolic and antioxidative response.

Water deficit triggers physiological, biochemical, and molecular changes in leaves that could be important for overall plant adaptive response and it can affect tomato yield and quality. To assess the influence of long-term moderate drought on leaves, four tomato accessions from MAGIC TOM populations were selected on the basis of their differences in fruit size and were grown in a glasshouse under control and water deficit conditions. Drought affected stomatal conductance more in large fruit genotypes compared to cherry genotypes and this could be related to higher abscisic acid (ABA) leaf content. Compared to large fruits, cherry tomato genotypes coped better with water stress by reducing leaf area and maintaining photochemical efficiency as important adaptive responses. Accumulation of soluble sugars in the cherry genotypes and organic acid in the leaves of the larger fruit genotypes indicated their role in the osmoregulation and the continuum of source/sink gradient under stress conditions. Long-term moderate drought induced upregulation of NCED gene in all four genotypes that was associated with ABA production. The increase in the expression of ZEP gene was found only in the LA1420 cherry genotype and indicated its possible role in the protection against photooxidative stress induced by prolonged water stress. In addition, upregulation of the APX genes, higher accumulation of vitamin C and total antioxidant capacity in cherry genotype leaves highlighted their greater adaptive response against long-term drought stress compared to larger fruit genotypes that could also reflect at fruit level. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s12298-021-01102-2.

The association of circulating sclerostin level with markers of bone metabolism in patients with thyroid dysfunction.

BACKGROUND: The aim of this study was to compare serum sclerostin concentrations in patients with thyroid dysfunction with euthyroid control subjects and to assess the relationship between sclerostin and markers of bone metabolism (osteocalcin and beta-cross-laps). METHODS: The study included 30 patients with thyroid dysfunction (hypothyroidism, hyperthyroidism and subclinical hyperthyroidism) and ten euthyroid controls. Free thyroxine (FT4) was measured by radioimmunoassay, while thyroid stimulating hormone (TSH) concentration was determined immunoradiometrically. We used an ELISA kit to determine the sclerostin level. The electrochemiluminescence method was applied for measuring the bone markers. RESULTS: Sclerostin levels were significantly lower in hypothyroid patients (p=0.009) and significantly elevated in hyperthyroid patients (p=0.008) compared to control values. Hyperthyroid patients also had higher sclerostin than patients with subclinical hyperthyroidism (p=0.013). Sclerostin concentrations were negatively correlated with TSH levels (r=-0.746, p<0.001), but positively with FT4 (r=0.696, p < 0.001). Moreover, sclerostin was positively associated with osteocalcin (r=0.605, p=0.005) and beta-cross-laps levels (r=0.573, p=0.008) in all thyroid patients. CONCLUSIONS: Serum sclerostin is significantly affected in subjects with thyroid dysfunction. Both sclerostin and thyroid status affect bone homeostasis, which is reflected through the significant correlations with osteocalcin and beta-cross-laps.

Efficacy of a skin care cream with TRPV1 inhibitor 4-t-butylcyclohexanol in the topical therapy of perioral dermatitis.

BACKGROUND: Perioral dermatitis is a clinically distinctive reaction pattern of facial dermatitis, including redness, dryness, burning, pruritus and skin tightness. A gold standard treatment remains unclear. OBJECTIVES: Our study evaluates the clinical value of a skin care cream with the transient receptor potential vanilloid type 1 inhibitor 4-t-butylcyclohexanol in POD patients over 8 weeks. METHODS: This open, unblinded 8-week clinical trial included 48 patients. A skin care cream containing 4-t-butylcyclohexanol was applied over a period of 8 weeks. Standardized questionnaires were used at baseline, 4 and 8 weeks, for history documentation, objective and subjective severity scores, and quality of life assessments. Six different skin physiology parameters were assessed at all timepoints. RESULTS: The perioral dermatitis severity score decreased significantly during the treatment period. This was mirrored by significantly lower patients' subjective numerical rating score and an improved quality of life score. Transepidermal water loss, stratum corneum hydration and skin erythema improved significantly during the treatment period. CONCLUSION: This transient receptor potential vanilloid type 1 inhibitor-based skin care cream improved subjective and objective parameters of perioral dermatitis. Decreased transepidermal water loss values and increased stratum corneum hydration demonstrate a restored skin barrier function. Consequently, the topical inhibition of these receptors is a promising management option for POD.

Efficacy and Tolerability of a Cosmetic Skin Care Product With Trans-4-t-butylcyclohexanol and Licochalcone A in Subjects With Sensitive Skin Prone to Redness and Rosacea.

BACKGROUND: Sensitive skin and rosacea are skin conditions, which may affect the quality of life of the patients considerably. In vitro and in vivo data indicated that the combination of trans-t-butylcyclohexanol and licochalcone A is an effective combination for alleviating the increased sensitivity of rosacea subtype I.

OBJECTIVE: Objective of this open dermocosmetic study was to investigate the efficacy and tolerability of a skin care product containing the anti-inflammatory licochalcone A and the TRPV1 antagonist trans-t-butylcyclohexanol in subjects with sensitive skin prone to redness and rosacea.

METHODS: 1221 subjects with sensitive skin and rosacea stage 0-II applied the test product twice daily for 4 weeks. Clinical assessment of sensitive skin and rosacea symptoms were performed at baseline and after 4 weeks. Additionally, at treatment end the test subjects filled a self-assessment questionnaire.

RESULTS: After 4 weeks of application, both, clinical and subjective assessment have shown improvement of all symptoms of sensitive skin and rosacea in a significant number of subjects (P less than 0.001). The test product was efficacious and very well tolerated also when used in conjunction with pharmacological treatments of the skin condition under scrutiny.

Conclusions: The study confirmed the good tolerability and efficacy of the skin care product in the management of sensitive skin prone to redness and rosacea when used alone or in combination with other therapies.

J Drugs Dermatol. 2017;16(6):605-611.

Transforming Growth Factor Beta 1 (TGF-ß1) in Thyroid Cancer Patients: a View from the Peripheral Blood.

Transforming growth factor beta (TGF-ß) plays an important role in many pathophysiological conditions, including cancer. The level of TGF-ß in patients with differentiated thyroid cancer (DTC) has not been examined so far. The aim of this study was to measure TGF-ß concentration in serum samples and in PHA-stimulated whole blood culture in vitro and to analyze possible associations of TGF-ß1 levels with leukocyte, lymphocyte and platelets counts, the histological type of thyroid cancer, and stage of disease. TGF-ß1 was measured in 22 DTC patients and 20 healthy controls using the duoSet ELISA Development kit for human TGF-ß1. The concentration of TGF-ß1 in serum samples from both groups correlated positively with the platelet counts. There was no statistically significant difference in the serum concentrations of TGF-ß1 between DTC patients and control subjects, but PHA stimulated whole blood cultures of DTC patients produced less TGF-ß1 than those from controls. Additional studies are needed to determine the significance of these in vitro findings.

The neurotoxic effects of hydrogen peroxide and copper in Retzius nerve cells of the leech Haemopis sanguisuga.

Oxidative stress and the generation of reactive oxygen species (ROS) play an important role in cellular damage. Electrophysiological analyses have shown that membrane transport proteins are susceptible to ROS. In the present study, oxidative stress was induced in Retzius nerve cells of the leechHaemopis sanguisugaby bath application of 1 mM of hydrogen peroxide (H2O2) and 0.02 mM of copper (Cu) for 20 min. The H2O2/Cu(II) produced considerable changes in the electrical properties of the Retzius nerve cells. Intracellular recording of the resting membrane potential revealed that the neuronal membrane was depolarized in the presence of H2O2/Cu(II). We found that the amplitude of action potentials decreased, while the duration augmented in a progressive way along the drug exposure time. The combined application of H2O2and Cu(II) caused an initial excitation followed by depression of the spontaneous electrical activity. Voltage-clamp recordings revealed a second effect of the oxidant, a powerful inhibition of the outward potassium channels responsible for the repolarization of action potentials. The neurotoxic effect of H2O2/Cu(II) on the spontaneous spike electrogenesis and outward K(+)current of Retzius nerve cells was reduced in the presence of hydroxyl radical scavengers, dimethylthiourea and dimethyl sulfoxide, but not mannitol. This study provides evidence for the oxidative modification of outward potassium channels in Retzius nerve cells. The oxidative mechanism of the H2O2/Cu(II) system action on the electrical properties of Retzius neurons proposed in this study might have a wider significance, referring not only to leeches but also to mammalian neurons.

5-HT2A and 5-HT2C receptors as hypothalamic targets of developmental programming in male rats.

Although obesity is a global epidemic, the physiological mechanisms involved are not well understood. Recent advances reveal that susceptibility to obesity can be programmed by maternal and neonatal nutrition. Specifically, a maternal low-protein diet during pregnancy causes decreased intrauterine growth, rapid postnatal catch-up growth and an increased risk for diet-induced obesity. Given that the synthesis of the neurotransmitter 5-hydroxytryptamine (5-HT) is nutritionally regulated and 5-HT is a trophic factor, we hypothesised that maternal diet influences fetal 5-HT exposure, which then influences development of the central appetite network and the subsequent efficacy of 5-HT to control energy balance in later life. Consistent with our hypothesis, pregnant rats fed a low-protein diet exhibited elevated serum levels of 5-HT, which was also evident in the placenta and fetal brains at embryonic day 16.5. This increase was associated with reduced levels of 5-HT2CR, the primary 5-HT receptor influencing appetite, in the fetal, neonatal and adult hypothalamus. As expected, a reduction of 5-HT2CR was associated with impaired sensitivity to 5-HT-mediated appetite suppression in adulthood. 5-HT primarily achieves effects on appetite by 5-HT2CR stimulation of pro-opiomelanocortin (POMC) peptides within the arcuate nucleus of the hypothalamus (ARC). We show that 5-HT2ARs are also anatomically positioned to influence the activity of ARC POMC neurons and that mRNA encoding 5-HT2AR is increased in the hypothalamus ofin uterogrowth-restricted offspring that underwent rapid postnatal catch-up growth. Furthermore, these animals at 3 months of age are more sensitive to appetite suppression induced by 5-HT2AR agonists. These findings not only reveal a 5-HT-mediated mechanism underlying the programming of susceptibility to obesity, but also provide a promising means to correct it, by treatment with a 5-HT2AR agonist.

A Rare Case of Infectious Multifocal Serpiginoid Choroiditis

Multifocal serpiginoid choroiditis is an infectious variety of serpiginous choroiditis. The disease is characterized by infectious etiology and overlapping clinical features in an intermediary form of acute posterior multifocal placoid pigment epitheliopathy and serpiginous choroiditis. In a 33-year-old patient, bilateral multiple placoid partially confluent chorioretinal lesions were diagnosed after a febrile flu-like episode. On the right eye, there was a progressive decrease in visual acuity. Later, the lesions had a prolonged progressive devastating clinical course and widespread distribution of placoid lesions, and took the form of serpiginoid choroiditis. We conducted extensive laboratory work-up and ancillary investigation for granulomatous diseases such as tuberculosis and sarcoidosis, and the results were not consistent with these entities. Systemic medical work-up revealed a history of exposure to the human immunodeficiency virus, herpes simplex virus 1, varicella zoster virus and cytomegalovirus. The titer of Mycoplasma pneumoniae IgM antibodies was positive. After serological analysis positive for Mycoplasma pneumoniae, systemic antibiotic therapy and anti-inflammatory doses of corticosteroids were administered. Improvement of visual acuity after the introduction of causal antibiotic therapy in combination with anti-inflammatory therapy confirmed our suspicion that Mycoplasma pneumoniae was the etiologic cause of multifocal serpiginoid choroiditis.

Relentless placoid chorioretinitis ­ A case report.

Introduction: Relentless placoid chorioretinitis is an entity which belongs to the group of an atypical intermediate form of primary inflammatory choriocapillaropathies, resembling both acute posterior multifocal placoid pigment epitheliopathy and serpiginous choroiditis, but the retinal distribution and clinical course are not the same. Because of this similarity this entity was termed "AMPPiginous". This entity was first described by Jones et al. in 2000. The aim of our case report is to present a very specific case where the clinical course was progressive, with loss of vision in the affected eye. Case Outline: A 31-year-old man, with no previous ophthalmic diseases, was hospitalized at the Clinic of Ophthalmology, Clinical Center Kragujevac, because of a reduction of vision in the right eye, and scotoma and metamorphopsia in the left eye. The clinical course of retinal lesions in the left eye resembled the changes observed in acute posterior multifocal placoid pigment epitheliopathy, and the right eye changes were between acute posterior multifocal placoid pigment epitheliopathy and serpiginous choroiditis. The diagnosis of relentless placoid chorioretinitis was confirmed after clinical, laboratory, immunological, virological, and angiography examinations. Conclusion: The progressive clinical course of the disease, complemented by multimodal imaging and extensive laboratory diagnostics, has led us to the diagnosis of relentless placoid chorioretinitis. The combined anti-inflammatory and immunomodulatory therapy led to the stabilization of visual acuity of the left eye as opposed to the right, where there has been no recovery.

Cytokine production in patients with papillary thyroid cancer and associated autoimmune Hashimoto thyroiditis.

Hashimoto thyroiditis (HT) is the most frequent thyroid autoimmune disease, while papillary thyroid cancer (PTC) is one of the most common endocrine malignancies. A few patients with HT also develop PTC. The aim of this study was to analyze cytokine profiles in patients with PTC accompanied with autoimmune HT in comparison with those in patients with PTC alone or HT alone and healthy subjects. Cytokine levels were determined in supernatants obtained from phytohemagglutinin (PHA)-stimulated whole blood cultures in vitro. The concentrations of selected cytokines: Th1-interferon gamma (IFN-γ); Th2-interleukin 4 (IL-4), interleukin 5 (IL-5), interleukin 6 (IL-6), interleukin 10 (IL-10) and interleukin 13 (IL-13); Th9-interleukin 9 (IL-9); and Th17-interleukin 17 (IL-17A) were measured using multiplex cytokine detection systems for human Th1/Th2/Th9/Th17/Th22. We found that PTC patients with HT produced significantly higher concentrations of IL-4, IL-6, IL-9, IL-13 and IFN-γ than PTC patients without HT. In conclusion, autoimmune HT affects the cytokine profile of patients with PTC by stimulating secretion of Th1/Th2/Th9 types of cytokines. Th1/Th2 cytokine ratios in PTC patients with associated autoimmune HT indicate a marked shift toward Th2 immunity.

Magnesium Effects on Nonsynaptic Epileptiform Activity in Leech Retzius Neurons.

The effects of Mg2+ on Ni(2+)-induced epileptiform bursting activity and input membrane resistance during this activity of leech Retzius neurons were examined using intracellular recordings. To induce epileptiform activity, 3 mmol/l NiCl2 was added into superfusing Ringer (Ri) saline. To test for dose-dependence of the effects of Mg2+ on the induced epileptiform activity, MgCl2 was added in concentrations from 1 mmol/l to 20 mmol/l Mg2+ to the Ni(2+)-containing Ri saline. Input membrane resistance (IMR) was measured in standard Ri, Ni2+ Ri and 20 mmol/l Mg2+Ni2+ Ri saline. Superfusion with Ni2+ Ri induced epileptiform bursting activity characterized by generation of paroxysmal depolarization shifts (PDSs). Parameters of epileptiform activity including PDS frequency, PDS duration, PDS amplitude and the number of spikes/PDS were measured. Magnesium suppressed Ni(2+)-induced epileptiform activity, significantly reducing values of all parameters observed in a concentration-dependent manner. The highest concentration applied of 20 mmol/l Mg2+ completely eliminated epileptiform activity. To test for the effect of Mg2+ on membrane conductance during bursting, IMR was measured. Magnesium significantly increased IMR during bursting suppression.

Multicenter survey of endoscopic treatment of vesicoureteral reflux using polyacrylate-polyalcohol bulking copolymer (Vantris).

OBJECTIVE: To evaluate an outcome of endoscopic correction of vesicoureteral reflux (VUR) using Vantris (Promedon, Cordoba, Argentina) in terms of its effectiveness and morbidity in a multicenter study. MATERIALS AND METHODS: From 2009 to 2013, 611 patients (210 boys and 401 girls) with a mean age of 3.56 years (range, 1 month-18 years) were treated at 7 centers worldwide endoscopically with Vantris injection. VUR was unilateral in 413 and bilateral in 198 patients comprising 809 renal refluxing units (RRUs). Of these, primary VUR was present in 674 RRUs (83.3%) and 135 (16.7%) were complex cases. Reflux was grades I-V in 24 (2.96%), 123 (15.2%), 451 (55.8%), 158 (19.5%), and 53 (6.6%) RRUs respectively. The follow-up continued from 6 to 54 months. RESULTS: Reflux resolved in 759 RRUs (93.8%) after first Vantris injection, in 26 (3.1%) after second, and in 6 (0.7%) after third injection, respectively. VUR improved to grade I after 1 or 2 injections in 5 ureters (0.6%), which needed no further treatment. Thirteen ureters (1.6%) failed endoscopic correction and required ureteral reimplantation. Vesicoureteral junction obstruction requiring ureteral reimplantation developed in 6 ureters (0.7%) and in 4 (0.5%) required stent insertion. Twenty-three patients (3.8%) suffered afebrile urinary tract infection. Seven (1.2%) developed febrile urinary tract infection. None of the studied patients demonstrated VUR recurrence on voiding cystourethrography. CONCLUSION: The results of this multicenter survey confirm that endoscopic subureteral Vantris injection is a simple, safe, and effective outpatient procedure for treating all grades of VUR.

Glutathione-conjugated sulfanylalkanols are substrates for ABCC11 and γ-glutamyl transferase 1: a potential new pathway for the formation of odorant precursors in the apocrine sweat gland.

We have previously shown that precursors of odorous components characteristic of axillary sweat are hardly detectable or undetectable in individuals carrying the 538G > A SNP in the ABCC11 transporter gene. However, it is unclear, whether ABCC11 is directly involved in the transport of these compounds. To approach this question, transport of peptide-conjugated potential precursors of 3-methyl-3-sulfanylhexanol (3M3SH), a key determinant of axillary malodour, was measured using membrane vesicles of Sf9 insect cells overexpressing human ABCC11. Whilst no ABCC11-mediated transport was detected for the dipeptide precursor Cys-Gly-3M3SH, the glutathione conjugate of 3M3SH (SG-3M3SH) was robustly taken up by ABCC11 at a transport rate of 0.47 pmol/mg/min. Collectively, these results illuminate SG-3M3SH as a putative precursor of 3M3SH, which then may undergo intra-vesicular maturation to generate Cys-Gly-3M3SH. Critically, the apocrine sweat gland was demonstrated to express γ-glutamyl transferase 1 (GGT1) protein, which is known to catalyse the deglutamylation of glutathionyl conjugates. Additionally, we provide evidence that recombinant and isolated hepatic human GGT1 is capable of transforming SG-3M3SH to Cys-Gly-3M3SH in vitro. To sum up, we demonstrate that the functionality of ABCC11 is likely to play an important role in the generation of axillary malodour. Furthermore, we identify GGT1 as a key enzyme involved in the biosynthesis of Cys-Gly-3M3SH.

Toxicity induced by cumene hydroperoxide in leech Retzius nerve cells: the protective role of glutathione.

In the present study, we studied the ability of glutathione (GSH) to detoxify exogenously applied cumene hydroperoxide (CHP). Exposure of leech Retzius nerve cells to CHP (1.5 mM) induced a marked prolongation of the spontaneous spike potential of these cells. Early after depolarization, and a cardiac-like action potential with a rapid depolarization followed by a sustained depolarization or plateau, which is terminated by a rapid repolarization were recorded. GSH (0.2 mM) significantly inhibited the effects of CHP on the duration of the action potential and suppressed CHP-induced spontaneous repetitive activity. Voltage-clamp recordings showed that CHP (1.5 mM) caused significant changes in the outward potassium currents. The fast and slow steady part of the potassium outward current was reduced by 46% and 39%, respectively. GSH applied in a concentration of 0.2 mM partially blocked the effect of CHP on the calcium-activated potassium currents. The fast and slow calcium-activated potassium currents were suppressed by about 20% and 15%, respectively. These results suggest that the neurotoxic effect of CHP on spontaneous spike electrogenesis and calcium-activated potassium currents of leech Retzius nerve cells was reduced in the presence of GSH.

Severe obesity and diabetes insipidus in a patient with PCSK1 deficiency.

Non-synonymous mutations affecting both alleles of PCSK1 (proprotein convertase 1/3) are associated with obesity and impaired prohormone processing. We report a proband who was compound heterozygous for a maternally inherited frameshift mutation and a paternally inherited 474kb deletion that encompasses PCSK1, representing a novel genetic mechanism underlying this phenotype. Although pro-vasopressin is not a known physiological substrate of PCSK1, the development of central diabetes insipidus in this proband suggests that PCSK1 deficiency can be associated with impaired osmoregulation.

[Clinical profile of presumed and definitive ocular sarcoidosis].

INTRODUCTION: Sarcoidosis is an antigen-mediated disease of unknown cause defined by granulomatous inflammation of different organs. OBJECTIVE: The aim of this study was to analyze the clinical picture in 26 patients with a definitive and presumed ocular sarcoidosis. METHODS: The following tests were conducted: angiotensin-converting enzyme, tuberculin skin test, liver enzymes and calcium in urine and serum. Enlarged hilar lymph glands were diagnosed using X-ray tomography or computed tomography of the mediastinum. A biopsy of lymph glands was performed either transbronchially or transmediastinally. Ophthalmic examination included biomicroscopic examination, intraocular pressure measurement, photofundus, fluorescein angiography, optical coherence tomography and computerized perimetry. RESULTS: The average follow-up period of the disease was 6.1 years. The average age was 52.0 years. There were 62.5% female patients, with bilateral incidence of 69.2%. The clinical picture included: panuveitis (in 30.8% of patients), anterior uveitis (26.9%), posterior uveitis (26.9%), intermediate uveitis (7.7%) and vitritis in (7.7%). The following complications were observed: cataract (in 34.6% of patients), cystoid macular edema (23.1%), glaucoma (15.4%), macroaneurysms (15.4%), neovascularization (7.7%) and band keratopathy (3.8%). There was a statistically significant difference in the visual acuity (p = 0.033) and severity of clinical symptoms (p = 0.02) between the groups of patients with retinal vasculitis associated with"candle-wax" phenomenon and the group of patients with multiple chorioretinal lesions--"white dot" syndrome. CONCLUSION: To our consideration, the differences observed between the two groups are the result of retinal vasculitis and subsequent macular edema, which is significantly more frequent in the group with"candle-wax" phenomenon.

Comparison of the effects of cumene hydroperoxide and hydrogen peroxide on Retzius nerve cells of the leech Haemopis sanguisuga.

Oxidative stress and the production of reactive oxygen species are known to play a major role in neuronal cell damage, but the exact mechanisms responsible for neuronal injury and death remain uncertain. In the present study, we examined the effects of oxidative stress on spontaneous spike activity and depolarizing outward potassium current by exposing the Retzius neurons of the leech to cumene hydroperoxide (CHP) and hydrogen peroxide (H(2)O(2)), the oxidants commonly used to examine oxidative mechanisms mediating cell death. We observed that relatively low concentrations of CHP (0.25, 1, and 1.5 mM) led to a marked prolongation of spontaneous repetitive activity. The prolonged action potentials showed an initial, spike-like depolarization followed by a plateau phase. In contrast, H(2)O(2) at the same and much higher concentrations (0.25 to 5 mM) did not significantly change the duration of spontaneous spike potentials of leech Retzius nerve cells (LRNCs). In the voltage clamp experiments, calcium-activated outward potassium currents, needed for the repolarization of the action potential, were suppressed with CHP, but not with H(2)O(2). The present findings indicate that CHP is a more potent oxidant and neurotoxin than H(2)O(2) and that the effect of CHP on the electrophysiological properties of LRNCs may be due to the inhibition of the potassium channels.

Two cases of uveitis masquerade syndrome caused by bilateral intraocular large B-cell lymphoma.

INTRODUCTION: Sometimes it is not easy to clinically recognize subtle differences between intraocular lymphoma and noninfectious uveitis. The most common lymphoma subtype involving the eye is B-cell lymphoma. CASE REPORT: We presented two patients aged 59 and 58 years with infiltration of the subretinal space with a large B-cell non-Hodgkin intraocular lymphoma. The patients originally had clinically masked syndrome in the form of intermediate uveitis. As it was a corticosteroid-resistant uveitis, we focused on the possible diagnosis of neoplastic causes of this syndrome. During hospitalization, the neurological symptoms emerged and multiple subretinal changes accompanied by yellowish white patches of retinal pigment epithelium with signs of vitritis, which made us suspect the intraocular lymphoma. Endocranial magnetic resonance imaging established tumorous infiltration in the region of the left hemisphere of the cerebellum. The histopathological finding confirmed the diagnosis of large B-cell non-Hodgkin lymphoma of risk moderate degree, immunoblast--centroblast cytological type. The other patient had clinical chronic uveitis accompanied by yellowish shaped white echographic changes of the retina and localized changes in the level of the subretina. The diagnosis of lymphoma was made by brain biopsy. CONCLUSION: Uveitis masquerade syndrome should be considered in all patients over 40 years with idiopathic steroid-resistant uveitis. Treatment begun on time can affect the course and improve the prognosis of uveitis masquerade syndrome (UMS) and systemic disease.