Seminal toxicity of nickel sulfate in mice

Young male albino mice of Swiss strain were exposed to nickel by oral route of 20 mg nickel sulfate/kg body weight for 5 d/wk for 6 mo. A decrease in normal (testosterone-dependent) proteinuria was shown, and morphological examination of the seminal vesicles revealed a lower weight and smaller size as well as a histological indication of lower secretory activity of the epithelium compared to controls. The findings are consistent with a theory implying a decreased testosterone activity in nickel-treated animals.

First Report of Lasiodiplodia theobromae as a Foliar Pathogen of Parthenium hysterophorus

Parthenium (Parthenium hysterophorus L.) has been a target of weed researchers in India for more than four decades. The weed is attacked by many pathogens, some of which have been tried as mycoherbicides with mixed results (1). In an effort to identify more pathogens of parthenium, surveys were conducted in different regions. A typical foliar disease was frequently observed in several districts of Karnataka State, especially during the winter months of 1996 to 1998. The primary symptoms were circular to irregular, light brown to gray leaf spots, ranging from 2 to 8 mm in diameter. Careful observation of diseased plants revealed that the development of several lesions in close proximity resulted in a rapid necrosis and withering of the entire leaf. The suspected causal organism, which was a dark, chocolate-brown fungus, grew well on potato-dextrose agar at 25°C and a 12-h photoperiod. It produced slowly maturing conidia (20 to 27 × 12 to 14 μm), which were dark brown, ellipsoid, thick-walled, and single-septate with longitudinal striations. A dense conidial suspension (10⁸ conidia per ml) of the fungus was evenly applied (250 μl per leaf) on detached, surface-sterilized, healthy parthenium leaves (N = 10), and infection was ascertained after 4 days of incubation at 26 ± 2°C in petri dishes lined with moist cotton. When 45-day-old pot-grown parthenium plants (N = 50) were similarly inoculated and maintained above 95% RH for at least 48 h, typical symptoms resembling those of naturally infected plants were visible on 88% of the plants within 3 weeks of incubation at 28 ± 2°C. Whereas the fungus was consistently isolated from diseased leaves of inoculated plants, with 80% frequency of reisolation, uninoculated controls neither displayed symptoms nor yielded the pathogen. The experiment was performed three times with similar results, satisfying Koch's postulates. The identity of one of the virulent isolates, WF(Ph)8 (ex Siddeswaranadurga, Chitradurga district, December 1997), was confirmed as Lasiodiplodia theobromae (Pat.) Griffon. & Maubl. (=Botryodiplodia theobromae Pat.) (IMI 378919a) at CABI Bioscience, UK Centre (Egham). Although it is a ubiquitous tropical and subtropical plant pathogen that occurs between 40°N and 40°S (2), it was not previously recorded as a cause of leaf disease on parthenium. Investigations on the possible use of the pathogen as a mycoherbicide have given encouraging results. References: (1) P. Sreerama Kumar. 1998. Pages 192-210 in: Biological Suppression of Plant Diseases, Phytoparasitic Nematodes and Weeds. S. P. Singh and S. S. Hussaini, eds. Project Directorate of Biological Control, Bangalore, India. (2) B. C. Sutton. 1980. The Coelomycetes. Commonwealth Mycological Institute, Kew, England.

Management of pericardial effusion by drainage: a survey of 10 years' experience in a city centre general hospital serving a multiracial population

The aim of the study was to determine the aetiology of large and symptomatic pericardial effusions and to review the management and subsequent outcome. A survey was done on a consecutive cases of patients who had undergone percutaneous pericardiocentesis over a 10 year period in a city centre general hospital serving a multiethnic catchment population. In all, 46 patients (24 male, 22 female; age range 16 to 90 years, mean 54 years) underwent a total of 51 pericardial drainage procedures (or attempted pericardiocentesis) between 1989 and 1998. Malignancy (44%), tuberculosis (26%), idiopathic (11%), and post-cardiac surgery (9%) were the most common causes of pericardial effusion. The most common presenting symptoms were breathlessness (90%), chest pain (74%), cough (70%), abdominal pain (61%) (presumed to be related to hepatic congestion), and unexplained fever (28%). In the 12 cases of tuberculous pericarditis, nine occurred in patients of Indo-Asian origin, and three in patients of Afro-Caribbean origin. Fever, night sweats, and weight loss were common among these patients, occurring in over 80% of cases of tuberculous pericarditis. Pulsus paradoxus was the most specific sign (100%) for the presence of echocardiographic features of tamponade, with strongest positive predictive value (100%). Although malignancy remains the most common cause in developed countries, tuberculous disease should be considered in patients from areas where tuberculosis is endemic. Percutaneous pericardiocentesis remains an effective measure for the immediate relief of symptoms in patients with cardiac tamponade, although its diagnostic yield in tuberculous pericarditis is relatively low.

High-oleic acid Australian Brassica napus and B. juncea varieties produced by co-suppression of endogenous Delta12-desaturases

Genetic engineering methods have been used successfully to modify the fatty acid profile of elite Australian germplasm of Brassica napus and B. juncea. Co-suppression plasmids carrying oleate desaturase genes from each species have been constructed and transferred into Australian elite breeding lines of B. napus and B. juncea using Agrobacterium tumifaciens plant-transformation techniques. Modifications to existing Brassica transformation protocols and the use of an intron-interrupted hygromycin-resistance gene as the selectable marker have resulted in improved transformation efficiencies. Silencing of the endogenous oleate desaturase genes has resulted in substantial increases in oleic acid levels, up to 89% in B. napus and 73% in B. juncea.

Functional role of residues corresponding to helical domain II (amino acids 35 to 46) of human immunodeficiency virus type 1 Vpr

Vpr, encoded by the human immunodeficiency virus type 1 genome, contains 96 amino acids and is a multifunctional protein with features which include cell cycle arrest at G(2), nuclear localization, participation in transport of the preintegration complex, cation channel activity, oligomerization, and interaction with cellular proteins, in addition to its incorporation into the virus particles. Recently, structural studies based on nuclear magnetic resonance and circular dichroism spectroscopy showed that Vpr contains a helix (HI)-turn-helix (HII) core at the amino terminus and an amphipathic helix (HIII) in the middle region. Though the importance of helical domains HI and HIII has been defined with respect to Vpr functions, the role of helical domain HII is not known. To address this issue, we constructed a series of mutants in which the HII domain was altered by deletion, insertion, and/or substitution mutagenesis. To enable the detection of Vpr, the sequence corresponding to the Flag epitope (DYKDDDDK) was added, in frame, to the Vpr coding sequences. Mutants, expressed through the in vitro transcription/translation system and in cells, showed an altered migration corresponding to deletions in Vpr. Substitution mutational analysis of residues in HII showed reduced stability for VprW38S-FL, VprL42G-FL, and VprH45W-FL. An assay involving cotransfection of NLDeltaVpr proviral DNA and a Vpr expression plasmid was employed to analyze the virion incorporation property of Vpr. Mutant Vpr containing deletions and specific substitutions (VprW38S-FL, VprL39G-FL, VprL42G-FL, VprG43P-FL, and VprI46G-FL) exhibited a negative virion incorporation phenotype. Further, mutant Vpr-FL containing deletions also failed to associate with wild-type Vpr, indicating a possible defect in the oligomerization feature of Vpr. Subcellular localization studies indicated that mutants VprDelta35-50-H-FL, VprR36W-FL, VprL39G-FL, and VprI46G-FL exhibited both cytoplasmic and nuclear localization, unlike other mutants and control Vpr-FL. While wild-type Vpr registered cell cycle arrest at G(2), mutant Vpr showed an intermediary effect with the exception of VprDelta35-50 and VprDelta35-50-H. These results suggest that residues in the HII domain are essential for Vpr functions.

Glucose transporters and glucose utilization in rat brain after acute ethanol administration

In the normal adult brain, glucose provides 90% of the energy requirements as well as substrate for nucleic acid and lipid synthesis. In the present study, effects of ethanol on glucose transporters (GLUT) and glucose utilization were examined in rat brain. Male Sprague-Dawley rats weighing 250-300 gms were given either ethanol 3 gm/kg BW or saline i.p. 4 hrs prior to the animal sacrifice and removal of the cerebral cortical tissue. The cortical plasma membranes analyzed by cytochalasin B binding assay showed a decrease in GLUT number but not in GLUT affinity in the ethanol treated rats as compared to the control rats. The estimated Ro values were 70 +/- 8.9 Vs 91 +/- 8.9 pmoles/mg protein (p < 0.05 N=4) and the estimated Kd values were 0.37 +/- 0.03 and 0.28 +/- 0.05 microM (p: NS) in ethanol and control experiments respectively. Immunoblots of purified cerebral plasma membranes and low density microsomal fraction showed 17% and 71% decrease for GLUTI and 54% and 21% (p<0.05 or less; n=6) for GLUT3 respectively in ethanol treated rats than in control animals. Immunofluoresence studies also showed reduction of GLUT1 immunoreactively in choroid plexus and cortical microvessels of ethanol treated rats as compared to control rats. The effect of ethanol on regional cerebral metabolic rates for glucose (CMR(Glc)) was studied using [6-(14)C] glucose and showed statistically insignificant decrease in brain glucose utilization. These data suggest that ethanol in-vivo decrease GLUT number and protein content in rat cerebral cortex.

Anomalous coronary arteries of aortic origin

Anomalous coronary arteries cause only uncharacteristic symptoms and are therefore often an incidental finding during conventional coronary angiography, with an incidence of 0.3-0.8%. The commonest anomaly is an aberrant origin of the main left or right coronary artery from the wrong sinus of Valsalva. Rarely there is a fistula draining into one of the cardiac cavities (right ventricle, right atrium, left ventricle or, rarely, superior vena cava) or displaced connection, as seen in anomalous origin of coronary artery from the pulmonary artery, resulting in a left-to-right shunt. In congenital heart disease, especially Fallot's tetralogy, the incidence of abnormal coronary arteries may be 2% or more. The proximal course in the former category may be misdiagnosed in up to 50% of cases. Aortic root injection with subtraction angiography, further detailed investigation with transoesophageal echocardiography or magnetic resonance angiography are therefore required as these have potential implications on subsequent surgery. Because of the abnormal course between aorta and pulmonary artery/outflow tract of the right ventricle and acute angulation there is a risk of angina, acute myocardial infarction or sudden death during or after exercise. It is therefore important to identify the exact cardiac anatomy, particularly in patients undergoing angioplasty, stenting or cardiac surgery.

Direct and translactational effect of arecoline alkaloid on the clocimum oil-modulated hepatic drug metabolizing enzymes in mice

The present study assesses the potential of arecoline alkaloid, by direct exposure in lactating dams and translactational exposure in neonates, to modulate the efficacy of clocimum oil as a blocking agent in chemopreventive pathway. Clocimum oil (25 or 50 microl/dam/day) induced a significant increase in the hepatic levels of phase II glutathione S-transferase (GST) and acid-soluble sulfhydryl in lactating dams and suckling neonates while the elevated levels of hepatic phase I cytochrome b5 (Cyt. b5) and cytochrome P-450 (P450) were observed only in the dams. Arecoline (0.6 mg/dam/day) alone did not modulate the hepatic GST and sulfhydryl levels in either dams or pups, although significant induction was observed in the hepatic levels of Cyt. b5, P450 and malondialdehyde (MDA) in lactating dams and suckling neonates. Clocimum oil-modulated hepatic levels of phase II components were depressed whereas phase I enzymes and lipid peroxides levels were further elevated by clocimum oil-plus-arecoline treatment. The direct or translactationally augmented levels of bioactivated species of the administered compounds, via enhanced phase I oxidative catalysis and less efficient GST/GSH conjugational detoxication, may suggest the antagonistic influence of arecoline on chemopreventive efficacy of clocimum oil.

Antiviral agent based on the non-structural protein targeting the maturation process of HIV-1: expression and susceptibility of chimeric Vpr as a substrate for cleavage by HIV-1 protease

The processing of precursor proteins (Gag and Gag-pol) by the viral protease is absolutely required in order to generate infectious particles. This prompted us to consider novel strategies that target viral maturation. Towards this end, we have engineered an HIV-1 virion associated protein, Vpr, to contain protease cleavage signal sequences from Gag and Gag-pol precursor proteins. We previously reported that virus particles derived from HIV-1 proviral DNA, encoding chimeric Vpr, showed a lack of infectivity, depending on the fusion partner. As an extension of that work, the potential of chimeric Vpr as a substrate for HIV-1 protease was tested utilizing an epitope-based assay. Chimeric Vpr molecules were modified such that the Flag epitope is removed following cleavage, thus allowing us to determine the efficiency of protease cleavage. Following incubation with the protease, the resultant products were analyzed by radioimmunoprecipitation using antibodies directed against the Flag epitope. Densitometric analysis of the autoradiograms showed processing to be both rapid and specific. Further, the analysis of virus particles containing chimeric Vpr by immunoblot showed reactivities to antibodies against the Flag epitope similar to the data observed in vitro. These results suggest that the pseudosubstrate approach may provide another avenue for developing antiviral agents.

Acute and chronic nicotine exposures modulate the immune system through different pathways

We have previously shown that T cells from rats exposed chronically to cigarette smoke or nicotine (NT) exhibit T cell anergy and decreased proliferation to T cell mitogens. Effects of chronic NT on T cell function persist for at least 2 weeks after the termination of NT treatment. Moreover, these effects of NT are causally related to the decreased Ca(2+) response to T cell receptor (TCR) ligation and constitutive activation of protein tyrosine kinase (PTK) and phospholipase C (PLC)-gamma1 activities. Acute NT treatment also suppresses the Con A-induced T cell proliferation; however, it is not known whether the mechanism(s) by which acute and chronic NT treatments inhibit T cell proliferation are identical. To evaluate this question, LEW rats were acutely treated with NT (1 mg/kg body wt) for 1, 2, or 24 h by an ip injection or implanted with constant-release miniosmotic pumps containing saline or NT (1 mg/kg body wt/day) for a 3-week chronic exposure. Inhibition of Con A-induced proliferation of peripheral blood cells (PBC) by both acute and chronic treatments was reversed by the inhibitor of nicotinic acetylcholine receptors, mecamylamine (MEC), indicating that these receptors are required for T cell proliferation. However, the effect of acute NT on the Con A response was short lived (i.e., observed at 1 and 2 h but not at 24 h after NT administration) and was seen in PBC but not in spleen cells. Unlike the chronic treatment, acute NT administration neither suppressed significantly the TCR-mediated [Ca(2+)](i) response nor did it cause the constitutive activation of PTK and PLC-gamma1 activities in blood lymphocytes. Acute, but not chronic, NT administration increased the plasma corticosterone concentration, and this increase was also inhibited by MEC. Moreover, adrenalectomy abrogated the acute but not chronic NT effects on the Con A response. Thus, the acute and chronic effects of NT on T lymphocytes are mechanistically distinct phenomena. Whereas chronic administration of NT causes T cell anergy, acute effects are primarily mediated via the activation of the hypothalamus-pituitary-adrenal axis.

Effects of cigarette smoke on immune response: chronic exposure to cigarette smoke impairs antigen-mediated signaling in T cells and depletes IP3-sensitive Ca(2+) stores

Chronic exposure of mice and rats to cigarette smoke affects T-cell responsiveness that may account for the decreased T-cell proliferative and T-dependent antibody responses in humans and animals exposed to cigarette smoke. However, the mechanism by which cigarette smoke affects the T cell function is not clearly understood. Our laboratory has shown that chronic exposure of rats to nicotine inhibits the antibody-forming cell response, impairs the antigen-mediated signaling in T cells, and induces T cell anergy. To determine the mechanism of cigarette smoke-induced immunosuppression and to compare it with chronic nicotine exposure, rats were exposed to diluted, mainstream cigarette smoke for up to 30 months or to nicotine (1 mg/kg b.wt./24 h) via miniosmotic pumps for 4 weeks, and evaluated for immunological function in vivo and in vitro. This article presents evidence suggesting that T cells from long-term cigarette smoke-exposed rats exhibit decreased antigen-mediated proliferation and constitutive activation of protein tyrosine kinase and phospholipase C-gamma1 activities. Moreover, spleen cells from smoke-exposed and nicotine-treated animals have depleted inositol-1, 4,5-trisphosphate-sensitive Ca(2+) stores and a decreased ability to raise intracellular Ca(2+) levels in response to T cell antigen receptor ligation. These results suggest that chronic smoking causes T cell anergy by impairing the antigen receptor-mediated signal transduction pathways and depleting the inositol-1,4, 5-trisphosphate-sensitive Ca(2+) stores. Moreover, nicotine may account for or contribute to the immunosuppressive properties of cigarette smoke.

Epitope-tagging approach to determine the stoichiometry of the structural and nonstructural proteins in the virus particles: amount of Vpr in relation to Gag in HIV-1

We used an epitope-tagging approach to determine the ratio of Gag (structural) to Vpr (nonstructural) in the virus particles directed by human immunodeficiency virus type 1. For this purpose, chimeric Gag and Vpr expression plasmids were constructed with the Flag epitope (DYKDDDDK), and the sequences corresponding to the chimeric protein were introduced into human immunodeficiency virus type 1 proviral DNA (NL4-3) to determine the ratio in the virus particles when these proteins are expressed in cis. In addition, NL4-3 DNA was modified to disrupt Vpr synthesis to determine the extent of incorporation of Vpr-FL when it is expressed in trans through a heterologous promoter. The analysis of virus particles generated by transfection of proviral DNA into RD cells indicated that (1) the ratio of Gag to Vpr in virus particles, when Vpr-FL is expressed in cis (in the context of proviral DNA), is in the range of 150-200:1 (14-18 molecules of Vpr per virion) and (2) the expression of Vpr-FL in trans showed efficient incorporation with a Gag to Vpr ratio of 5-7:1 (392-550 molecules of Vpr). These results suggest that the presence of the same epitope on different viral proteins may provide an accurate comparison of these proteins in the virus particles.

Extent of incorporation of HIV-1 Vpr into the virus particles is flexible and can be modulated by expression level in cells

To examine the factors that control the extent of incorporation of Vpr into the virus particles, we utilized an epitope-tagging approach with Flag (FL) as the epitope for quantitation. We generated expression plasmids containing Vpr-FL and Vpr E21,24P-FL and also HIV-1 proviral DNA containing Vpr-FL (NL-Vpr-FL). Immunoblot analysis using Flag antibodies revealed that virus particles derived from co-transfection of NL-Vpr-FL and Vpr-FL showed an enhanced level of Vpr-FL in comparison to NL-Vpr-FL derived virus. These results suggest that the amount of incorporation of Vpr into the virus particles is flexible and may be modulated by its expression level in cells.

Three-year outcome of first-episode psychoses in an established community psychiatric service

BACKGROUND

Changes in service provision, secular trends in substance misuse and changing social structures might affect outcome in psychosis.

AIMS

To assess the three-year outcome of an inception cohort of first-episode psychoses treated in a modern, community-oriented service; to compare outcomes with an earlier cohort treated in hospital-based care; and to examine the predictive validity of ICD-10 diagnostic criteria.

METHOD

Three-year follow-up (1995-1997) of an inception cohort of first-episode psychoses and comparison with two-year follow-up (1980-1982) of the Determinants of Outcome of Severe Mental Disorders (DOSMED) Nottingham cohort.

RESULTS

On most outcome measures, non-affective psychoses had a worse outcome than affective psychoses. Affective psychoses had better outcome than previously reported. Substance-related psychoses had very poor occupational outcome. Similar proportions of the current and DOSMED cohort were in remission but the former were rated as having greater disability.

CONCLUSIONS

In a modern community service, 30-60% of patients with first-episode psychoses experience a good three-year outcome. The ICD-10 criteria have good predictive validity.

Immune recognition of porin and lipopolysaccharide epitopes of Salmonella typhimurium in mice

We investigated the antigenic specificity of the humoral immune response to infection by Salmonella typhimurium, by competitive inhibition enzyme-linked immunosorbent assay and Western immunoblots. A panel of eight murine monoclonal antibodies, raised to OmpC and OmpD porins and lipopolysaccharide (LPS)-O antigens, was used to define the specificity of the polyclonal immune response in mice. The monoclonal antibody panel recognized five distinct epitopes; these were localized to surface-exposed loops of OmpC and OmpD porin, to the "eye-let" forming loop L3 of OmpC/OmpD, and to LPS-O4 and O5 factors. The immune mouse serum raised to infections with S. typhimurium LT-2 strain WB600 (wild-type) competitively inhibited the binding of biotin-labelled monoclonal antibodies to the epitopes that they recognize, indicating that all five epitopes were targets of the host immune response to natural infection. However, only two epitopes, one within a surface-exposed loop of OmpC porin, and the other in the LPS-O4 factor, were immunodominant. Furthermore, the bacterial LPS core and O-antigen structure influenced the immune response to the porins. Surface epitopes of porins were dominant in the rough strain SH5014 (rfa), whereas the immune recognition of LPS epitopes was predominant in mice infected with the smooth, wild-type strain (WB600). Finally, the immune response to LPS epitopes O4 and O5 was more pronounced in mice immunized with heat-killed cells than those infected with live S. typhimurium.

Quality of life in patients with early and advanced carcinoma of the breast

AIM

Emotional disturbances are known to occur in patients suffering from malignant diseases even after treatment. This is mainly because of a fear of death which modifies quality of life (QOL). QOL has gained an important place in the management of cancer in industrialized nations, with the increase in survival. However, in developing countries like India, very little attention has been paid to this issue. Developing countries have poor infrastructure and lack proper treatment facilities at most centres, this leads to poor survival rates and hence much emphasis is on attaining quantity of life rather than quality. This study was carried out to assess the quality of life determinant in patients with breast cancer and the impact of treatment on quality of life indices.

METHODS

We carried out QOL assessment in 50 patients with breast cancer using the modified linear analogue scale for self assessment (LASA).

RESULTS

Significant deterioration was seen in health-related parameters in terms of recreation (P=0.01), social life (P=0.002), mobility (P=0.03), physical activity (P=0.4) and sleep and appetite (P=0.05). Treatment related parameters deteriorated in both early and advanced carcinoma. Similarly, weight loss was seen in both the groups, however, this was not statistically significant. Self-care and recreation were found to be the most important parameters influencing the QOL in breast cancer patients.

CONCLUSIONS

Breast cancer detection programs, health education and better awareness among women in industrialized nations has helped in downstaging of the disease, thus improving overall survival. It has not been so in developing countries, where the majority of patients present with advanced disease (T3 and T4). These are usually managed with surgery and adjuvant chemotherapy, which duly interferes with general health-related parameters and the social life of these patients, thereby adversely affecting the QOL.

Acute appendicitis in children: comparison of clinical diagnosis with ultrasound and CT imaging

BACKGROUND

There is strong evidence that imaging with ultrasound and CT can be of substantial diagnostic value in the diagnosis of acute appendicitis in children, but there is limited information of the impact of imaging on the management of these patients and its possible effect on surgical findings.

OBJECTIVE

We studied the impact of imaging in the management of acute appendicitis, in particular its effect on the rate of negative appendectomies and perforations.

PATIENTS AND METHODS

We reviewed retrospectively the clinical records and imaging findings of 633 consecutive children and adolescents seen on an emergency basis with clinical suspicion of acute appendicitis. Two hundred seventy patients were operated upon on clinical evidence alone, while 360 were referred for US or CT, and occasionally both, because of doubtful clinical findings.

RESULTS

Acute appendicitis was found in 237 of those on clinical grounds alone, 68 of whom had perforation and related complications. Thus the rate of negative exploration and the rate of perforation were13 % and 29 %, respectively. One hundred eighty-two patients had preoperative US (sensitivity 74 %, specificity 94 %), 119 had CT (sensitivity 84 %, specificity 99 %), and 59 had both US and CT (sensitivity 75 %, specificity 100 %, but often with interpretation at variance with each other). The rate of negative appendectomy and perforation was 8 % and 23 %, respectively, for US, 5 % and 54 % for CT, and 9 % and 71 % when both examinations were performed. There is no statistical significance between the rates of diagnostic performance of US, CT, or their combination, nor between the negative appendectomy rates of each group, but the rate of perforation was significantly higher when CT was performed, alone or after US.

CONCLUSION

The retrospective nature of the study prevents precise definition of the clinical characteristics and selection criteria for diagnostic examinations that may contribute to the management of children with suspected acute appendicitis. It was designed, however, to reflect the diagnostic approach and management of these patients, under the care of many decision makers and interpreters of imaging examinations, prevalent today in most hospital-based clinical practices. It is suggested that imaging increases diagnostic accuracy in difficult cases, but it might be one of the factors increasing the rate of perforations.

Fibrous histiocytoma of orbit: a case report

A fifty year male (K.S.) presented with protrusion (Proptosis) of left eye which was gradually increasing in size for the last one year. The swelling was accompanied by pain for the last fifteen days. Preoperative X-ray & computed tomography showed erosion of frontal sinus & roof of maxillary sinus. Clinical diagnosis of a malignant tumour of eye was made & enucleation of the left eye, along with the mass was done. The specimen was received in the pathology department on 16.9.98. Grossly, encapsulated mass attached with the intact eye ball was received. The mass measured 5x3x2.5 cms. Microscopic examination revealed a benign spindle cell neoplasm and a diagnosis of fibrous histiocytoma (dermatofibroma) was made.

Male reproductive effect of nickel sulphate in mice

Nickel sulphate was administered orally to adult male mice at dose level of 5 and 10 mg/kg body weight (5 days per week) for 35 days. There was no change in body weight. However a significant decrease in absolute and organ-to-body weight ratios of testes, epididymides, seminal vesicles and prostate gland was observed. The sperm abnormality, associated with decrease in sperm motility and sperm count was also observed. Significant alterations in the activities of marker testicular enzymes, viz. sorbitol dehydrogenase (decreases), lactate dehydrogenase (increases) and gamma-glutamyl transpeptidase (increases) associated with histopathological changes in testes, epididymides and seminal vesicles, were also observed. Accumulation of nickel in testes, epididymides and seminal vesicles was also observed. The study reveals that the oral exposure to nickel may affect the histology of testes, epididymides, seminal vesicles and sperms morphology. These testicular and spermatotoxic changes may be responsible for observed male mediated developmental toxic effects.

Diagnostic stability of first-episode psychosis. Comparison of ICD-10 and DSM-III-R systems

BACKGROUND

The temporal stability of a diagnosis is one measure of its predictive validity.

AIMS

To measure diagnostic stability in first-episode psychosis using ICD-10 and DSM-III-R.

METHOD

Between 1992 and 1994 we ascertained a cohort of persons with first-episode psychosis (n = 168), assigning to each a consensus diagnosis. At three-year follow-up, longitudinal consensus diagnoses, blind to onset diagnoses, were made. Stability was measured by the positive predictive values (PPVs) of onset diagnoses. For onset schizophrenia, we also calculated sensitivity, specificity and concordance (kappa).

RESULTS

First-episode ICD-10 and DSM-III-R schizophrenia had a PPV of over 80% at three years. Over one-third of cases with ICD-10 F20 schizophrenia at three years had non-schizophrenia diagnoses at onset. Manic psychoses showed the highest PPV (91%). For onset schizophrenia, both systems had high specificity (ICD-10: 89; DSM-III-R: 93%), but low sensitivity (ICD-10: 64%; DSM-III-R: 51%) and moderate concordance (ICD-10: 0.54; DSM-III-R: 0.46).

CONCLUSIONS

Bipolar disorders and schizophrenia showed the highest stability. DSM-III-R schizophrenia did not have greater stability than ICD-10 schizophrenia.