UMLS:C0023380 - FACTA Search

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Query: UMLS:C0023380 (lethargy)
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A 53-year-old woman was admitted to the hospital because of headache and disturbance of consciousness. She was afebrile. No inflammatory reaction was identified on serologic examination. Radiological findings showed acute-subacute, massive intracerebral hemorrhage in the right temporal lobe, compressing the brain stem contra-laterally. On the day of admission, she underwent a right temporal craniotomy for the removal of the mass lesion. The resected brain tissue demonstrated a small hemorrhage and edema accompanied by the infiltration of lymphoid cells into the subarachnoid space. Several days after surgery, the patient became lethargic and showed urinary incontinence. Late onset of fever and CSF findings suggested she was suffering from viral encephalitis. Serological findings, however, disclosed no antibody production against HSV, HZV, or CMV. For the diagnosis, a biopsy of the brain was carried out and herpes encephalitis was subsequently proved. Unfortunately, her condition deteriorated quickly and she died without anti-viral treatment.
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PMID:[A case of fatal herpes encephalitis presenting massive cerebral hematoma]. 1132 98

A 7-year-old male Giant Schnauzer was referred with a history of severe vomiting, lethargy, weight loss, polydipsia and polyuria. Detailed investigations revealed leucocytosis with a marked lymphocytosis, mild non-regenerative anaemia, thrombocytopenia, hypercalcaemia and azotaemia. Circulating lymphocytes were small and well-differentiated, and the same lymphoid population was present in bone marrow. Chronic lymphocyctic leukaemia with associated paraneoplastic hypercalcaemia was diagnosed. Immunohistochemical staining of a bone marrow biopsy revealed a neoplastic B-cell line expressing CD79. The dog responded to therapy with prednisolone and chlorambucil for a period of 8 months.
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PMID:Hypercalcaemia associated with chronic lymphocytic leukaemia in a Giant Schnauzer. 1143 98

A juvenile female loggerhead sea turtle (Caretta caretta) stranded in Gran Canaria was submitted for necropsy. The turtle had exhibited anorexia and lethargy for 2 weeks prior to its death. At necropsy, the thymus was enlarged by two white and firm nodules. White nodules similar to those in thymus were observed in the plastron, thyroid gland, heart, aorta, left lung, spleen, liver, kidneys, stomach, and small intestine. Histopathology revealed a neoplastic proliferation of round cells identified as lymphoid cells. Ultrastructurally, the neoplastic cells were consistent with lymphoblastic cells, and viruses were not detected. The diagnosis was multicentric lymphoblastic lymphoma. This is the first report of a lymphoid neoplasm in a sea turtle.
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PMID:Multicentric lymphoblastic lymphoma in a loggerhead sea turtle (Caretta caretta). 1146 84

Lymphoproliferative disorders associated with the Epstein-Barr virus (EBV) include non-Hodgkin's lymphoma, Hodgkin's lymphoma, and "post-transplant lymphoproliferative disorders" (PTLD), which occur with immunosuppression after marrow and organ transplantation. PTLD is characterized by actively proliferating, latently infected EBV(+) B-lymphocytes, and often manifests a rapidly progressive fatal clinical course if the immunosuppression cannot be reversed. Lung transplant recipients are a subset of patients at special risk for developing PTLD. The incidence of PTLD development in these patients has been estimated at 5--10%. Whereas immunologic and antiviral therapy have been moderately effective for treating EBV-associated infections in the lytic phase, they have been less useful in the more common latent phase of the disease. One common treatment for herpesvirus infections has targeted the virus-specific enzyme thymidine kinase (TK). The lack of viral TK expression in EBV(+) tumor cells, due to viral latency, makes anti-viral therapy alone ineffective as an anti-neoplastic therapy, however. We have developed a strategy for the treatment of EBV-associated lymphomas/PTLD using pharmacologic induction of the latent viral TK gene and enzyme in the tumor cells, followed by treatment with ganciclovir. Arginine butyrate selectively activates the EBV TK gene in latently EBV-infected human lymphoid cells and tumor cells. A Phase I/II trial has been initiated, employing an intra-patient dose escalation of arginine butyrate combined with ganciclovir. In six patients with EBV-associated lymphomas or PTLD, all of which were resistant to conventional radiation and/or chemotherapy, this combination produced complete clinical responses in four of six patients, with a partial response occurring in a fifth patient. Pathologic examination in two of three patients demonstrated complete necrosis of the EBV lymphoma, with no residual disease, following a single three-week course of the combination therapy. Possible side-effects of the therapy included nausea and reversible lethargy at the highest doses. One patient suffered acute liver failure, thought to be secondary to release of FasL from the necrotic tumor. Analysis of patient-derived tumor cells in culture demonstrated that arginine butyrate produced selective induction of the EBV TK gene, which then conferred sensitivity to ganciclovir, resulting in tumor apoptosis. Additional patient accrual is sought for further evaluation of this therapy.
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PMID:Epstein--Barr virus post-transplant lymphoproliferative disease and virus-specific therapy: pharmacological re-activation of viral target genes with arginine butyrate. 1149

Three-week-old cesarean-derived colostrum-deprived (CD/CD) pigs were inoculated with porcine circovirus type 2 (PCV2, n = 19), porcine reproductive and respiratory syndrome virus (PRRSV, n = 13), concurrent PCV2 and PRRSV (PCV2/PRRSV, n = 17), or a sham inoculum (n = 12) to compare the independent and combined effects of these agents. Necropsies were performed at 7, 10, 14, 21, 35, and 49 days postinoculation (dpi) or when pigs became moribund. By 10 dpi, PCV2/PRRSV-inoculated pigs had severe dyspnea, lethargy, and occasional icterus; after 10 dpi, mortality in this group was 10/11 (91%), and all PCV2/ PRRSV-inoculated pigs were dead by 20 dpi. PCV2-inoculated pigs developed lethargy and sporadic icterus, and 8/19 (42%) developed exudative epidermitis; mortality was 5/19 (26%). PRRSV-inoculated pigs developed dyspnea and mild lethargy that resolved by 28 dpi. Microscopic lesions consistent with postweaning multisystemic wasting syndrome (PMWS) were present in both PCV2- and PCV2/PRRSV-inoculated pigs and included lymphoid depletion, necrotizing hepatitis, mild necrotizing bronchiolitis, and infiltrates of macrophages that occasionally contained basophilic intracytoplasmic inclusion bodies in lymphoid and other tissues. PCV2/ PRRSV-inoculated pigs also had severe proliferative interstitial pneumonia and more consistent hepatic lesions. The most severe lesions contained the greatest number of PCV2 antigen-containing cells. PRRSV-inoculated pigs had moderate proliferative interstitial pneumonia but did not develop bronchiolar or hepatic lesions or lymphoid depletion. All groups remained seronegative to porcine parvovirus. The results indicate that 1) PCV2 coinfection increases the severity of PRRSV-induced interstitial pneumonia in CD/CD pigs and 2) PCV2 but not PRRSV induces the lymphoid depletion, granulomatous inflammation, and necrotizing hepatitis characteristic of PMWS.
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PMID:Experimental reproduction of severe disease in CD/CD pigs concurrently infected with type 2 porcine circovirus and porcine reproductive and respiratory syndrome virus. 1157 60

Histological, cytochemical and ultrastructural changes in giant black tiger shrimp Penaeus monodon were investigated at various time intervals after injection with yellow head virus (YHV). Hemocytes, lymphoid organs (LO) and gills were the main focus of the study. After injection with YHV, onset of mortality varied from 36 h onward. By normal hematoxylin and eosin staining, the 3 tissues showed clear and increasing prevalence of nuclear condensation, pyknosis and karyorrhexis from approximately 36 h post-injection (p.i.) until death, although pathology was evident in the LO as early as 12 h p.i. in some shrimp. By nuclear DNA staining with 4',6-diamidino-2-phenylindole (DAPI) and by specific labeling of 3'-OH ends of nuclear DNA using a technique called terminal deoxynucleotidyl transferase-mediated deoxy-UTP nick-end labeling (TUNEL), cells of the 3 tissues showed evidence of chromatin condensation and DNA fragmentation, respectively. Both are generally considered to be characteristic of apoptosis. In addition to TUNEL labeling, evidence for DNA fragmentation was supported by the appearance of approximately 200 base pair DNA ladders at approximately 48 h p.i. in hemocytes of YHV-infected but not uninfected shrimp. Transmission electron microscopy (TEM) of LO tissue revealed features of apoptosis in tissues of YHV-infected shrimp only. These included marginated, condensed and fragmented chromatin without concurrent cytoplasmic damage. Histological, cytochemical, ultrastructural and biochemical data were consistent with the hypothesis that widespread and progressive apoptosis occurred in susceptible shrimp infected with YHV. Although no specific tests were carried out to determine whether this purported apoptosis was the cause of mortality, moribund shrimp had extensive deterioration of vital tissues such as the hemolymph, gills, heart and LO, suggesting that many essential bodily functions had been severely compromised. This probably resulted in the gross signs of lethargy and weakness seen, and it is reasonable to suggest that further, progressive deterioration could have led to the collapse of vital functions followed by death.
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PMID:Evidence for apoptosis correlated with mortality in the giant black tiger shrimp Penaeus monodon infected with yellow head virus. 1200 39

Two-week and 13-week toxicity studies of hexachloro-1,3-butadiene incorporated in the diet were conducted in B6C3F1 mice. Groups of five mice of each sex received diets containing 0, 30, 100, 300, 1,000, or 3,000 ppm hexachloro-1,3-butadiene for 15 days. Toxic responses in the 2-week studies, primarily in the higher dose groups, included abnormal clinical signs (lethargy, hunched posture, rough hair coats, light sensitivity, and/or in coordination), deaths (all mice in the two highest dose groups died by day 7), body and organ weight depression, and gross and histopathologic changes. The most prevalent microscopic lesion, seen in all hexachloro-1,3-butadiene-dosed mice, was renal tubular cell necrosis and/or regeneration. Regeneration was seen in lower dose groups. In addition to kidney lesions, histopathologic changes were also seen in the liver (hepatocyte necrosis, cytoplasmic vacuolization), lymphoid tissues (lymph node necrosis, depletion), and testis (seminiferous tubule giant cells) of mice in the two highest dose groups which died during the first week of the studies. Thirteen-week studies were conducted in which groups of 10 mice per sex received 0,1, 3,10, 30, or 100 ppm hexachloro-1,3-butadiene in feed (corresponding to doses of 0, 0.1, 0.4, 1.5, 4.9, or 16.8 mg/kg per day for males and 0.2, 0.5, 1.8, 4.5, or 19.2 mg/kg per day for females). No compound-related clinical signs or deaths were observed. Compared with controls, body weight gain was reduced in males receiving 30 and 100 ppm (-49% and -56%, respectively) and females receiving 100 ppm (-47%). Kidney weights were reduced in the males receiving 30 and 100 ppm and females receiving 100 ppm. A compound-related increase in tubular cell regeneration in the renal cortex occurred in male and female mice. This lesion, characterized by a diffuse increase in basophilia of the tubular epithelial cytoplasm and an increase in the number of nuclei, increased in severity with increased dose. The motility of sperm from dosed mice was lower, though not dose related, than that from controls. Female mice were more susceptible to the toxicity of hexachloro-1,3-butadiene than male mice. Based on the histopathologic evaluations, the no-observed-adverse-effect level appeared to be 10 ppm for the male mice in this 13-week study; no such level was identified for the female mice. Synonyms: HCBD; hexachlorobutadiene; 1,1,2,3,4,4-hexachloro-1,3- butadiene; perchlorobutadiene; C 46; Dolen-Pur, (NOTE: These studies were supported in part by funds from the Comprehensive Environmental Response, Compensation, and Liability Act trust fund (Superfund) by an interagency agreement with the Agency for Toxic Substances and Disease Registry, U.S. Public Health Service.)
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PMID:NTP technical report on the toxicity studies of Hexachloro-1,3-butadiene in B6C3F1 Mice (Feed Studies) (CAS No. 87-68-3). 1220 67

Postweaning multisystemic wasting syndrome (PMWS) in swine is causally associated with the newly recognised pathogen, porcine circovirus type 2 (PCV2). In this study, 3-week-old SPF PCV2-seronegative piglets were inoculated intranasally with PCV2. The effect of immunostimulation on the induction of PMWS was investigated by immunisation with keyhole limpet hemocyanin (KLH) emulsified in incomplete Freunds adjuvant. The study was terminated 5 weeks after inoculation. While disease was not observed in the age-matched controls, two out of five non-immunised PCV2-infected piglets died on postinoculation day (PID) 21, and one was euthanized on PID 25 in moribund condition. These animals had appeared lethargic with persistent fever from PID 12 onwards. The euthanized pig appeared smaller than littermates and suffered from jaundice. At postmortem examination, gastric ulceration, icterus, and liver and thymus atrophy were observed. Furthermore, histological lesions of degenerating hepatocytes and hepatitis in combination with lymphoid depletion and syncytial cells in lymph nodes were consistent with the diagnosis of PMWS. One out of five immunostimulated PCV2-infected piglets was euthanized on PID 22 with convulsions after a period with wasting. This pig was lethargic from PID 14 onwards with persistent fever from PID 8 and transient dyspnoea. No differences in clinical signs, gross pathologic or histological findings were observed for the remaining non-immunostimulated and immunostimulated PCV2-infected piglets. All 10 PCV2-inoculated piglets seroconverted to PCV2 within 14 days after inoculation. By virus isolation, quantitative polymerase chain reaction (Q-PCR), and immunostaining of cryostat sections, it was demonstrated that lymphoid tissue contained abundant PCV2 antigen. Viral DNA load in serum samples was assessed by Q-PCR. All four PMWS-affected piglets had high levels of PCV2 DNA in serum, suggesting that there was a correlation between high levels of viral DNA in serum and the development of PMWS. In conclusion, infection with PCV2 caused PMWS in SPF piglets, however, the immunostimulation did not seem to play a critical role.
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PMID:Reproduction of postweaning multisystemic wasting syndrome (PMWS) in immunostimulated and non-immunostimulated 3-week-old piglets experimentally infected with porcine circovirus type 2 (PCV2). 1224 88

Nickel sulfate hexahydrate is used in nickel plating, as a mordant in dyeing and printing textiles, as a blackening agent for zinc and brass, and in the manufacture of organic nickel salts. Nickel sulfate hexahydrate was nominated by the National Cancer Institute to the NTP as part of a class study of nickel compounds for which there was little information on the toxic and carcinogenic effects of inhalation exposure. Male and female F344/N rats and B6C3F1 mice were exposed to nickel sulfate hexahydrate (greater than 98% pure) by inhalation for 16 days, 13 weeks, or 2 years. Genetic toxicology studies were conducted in L5178Y mouse lymphoma cells. 16-DAY STUDY IN RATS: Groups of five male and five female F344/N rats were exposed to 0, 3.5, 7, 15, 30, or 60 mg nickel sulfate hexahydrate/m(3) (equivalent to 0, 0.7, 1.4, 3.1, 6.1, or 12.2 mg nickel/m(3)). Rats were exposed on weekdays only, for a total of 12 exposure days during a 16-day period. Additional groups of four or five male and female F344/N rats were exposed to 0, 3.5, 15, or 30 mg nickel sulfate hexahydrate/m(3)for tissue burden studies. In the core study, two 60 mg/m(3) males, one 30 mg/m(3) female, and all 60 mg/m(3)females died before the end of the study. Final mean body weights of all exposed groups of males and females were significantly lower than those of the controls, as were mean body weight gains of male rats. Clinical findings included increased rates of respiration and reduced activity levels in rats in all exposure groups, except those exposed to 3.5 mg/m(3). Absolute lung weights of 60 mg/m(3) males and of all exposed groups of females were significantly greater than those of the controls, as were the relative lung weights of all exposed groups of males and females. Inflammation (including degeneration and necrosis of the bronchiolar epithelium) occurred in the lungs of all exposed groups of males and females. Atrophy of the olfactory epithelium occurred in the nasal passages of all exposed groups of males (except 60 mg/m(3)) and in 15, 30, and 60 mg/m(3) females. Lymphoid hyperplasia in the bronchial or mediastinal lymph nodes was observed in 30 mg/m(3) males and in 60 mg/m(3) males and females. The concentration of nickel in the lungs of all exposed groups of males and females was greater than in control animals. 16-DAY STUDY IN MICE: Groups of five male and five female B6C3F1 mice were exposed to 0, 3.5, 7, 15, 30, or 60 mg nickel sulfate hexahydrate/m(3). Mice were exposed on weekdays only, for a total of 12 exposure days during a 16-day period. Additional groups of five male and five female B6C3F1 mice were exposed to 0 or 3.5 mg nickel sulfate hexahydrate/m(3)for tissue burden studies. All core study mice exposed to 7 mg/m(3) or greater died before the end of the study; all control and 3.5 mg/m(3)mice survived to the end of the study. Final mean body weights and weight gains of 7, 15, 30, and 60 mg/m(3)males and females were significantly less than those of the controls, and clinical findings in these groups included emaciation, lethargy, and rapid respiration rates. Absolute and relative lung weights of male and female mice exposed to 7 mg/m(3) or greater were significantly greater than those of the controls. Only tissues from mice exposed to 0, 3.5, or 7 mg/m(3) were examined histopathologically. Inflammation occurred in the lungs of 3.5 and 7 mg/m(3) males and females; necrosis of the alveolar and bronchiolar epithelium was a component of the inflammation in 7 mg/m(3)males and females. In addition, atrophy of the olfactory epithelium of the nasal passages was observed in 3.5 mg/m(3) males and females. Nickel concentrations in the lungs of mice exposed to 3.5 mg/m(3) were greater than those in the controls. 13-WEEK STUDY IN RATS: Groups of ten male and ten female F344/N rats were exposed to 0, 0.12, 0.25, 0.5, 1, or 2 mg nickel sulfate hexahydrate (equivalent to 0, 0.03, 0.06, 0.11, 0.22, or 0.44 mg nickel/m(3)), 5 days per week for 13 weeks. Additional groups of six male and six female F344/N rats were exposed to 0, 0.12, 0.5, or 2 mg nic mg nickel sulfate hexahydrate/m(3)for tissue burden studies. In the core study, one 2 mg/m(3)male rat died before the end of the study; all other males and all females survived until the end of the study. Final mean body weights and body weight gains of all exposed groups were similar to those of the controls. There were no significant clinical findings noted during the study. Exposure-related increases in neutrophil and lymphocyte numbers occurred and were most pronounced in female rats. With the exception of 0.12 mg/m(3)rats, absolute and relative lung weights of all exposed groups were generally significantly greater than those of the controls. Exposure-related increases in the incidence and severity of inflammatory lesions (alveolar macrophages, chronic inflammation, and interstitial infiltration) occurred in the lungs of all exposed groups of males and females. Lymphoid hyperplasia of the bronchial and/or mediastinal lymph nodes occurred in males exposed to 0.5 mg/m(3)or greater. Atrophy of the olfactory epithelium occurred in males and females exposed to 0.5, 1, and 2 mg/m(3)and in 0.25 mg/m(3)females. The concentration of nickel in the lungs of 0.5 and 2 mg/m(3) rats was greater than that in the lungs of control animals at 4, 9, and 13 weeks for males and at 13 weeks for females. 13-WEEK STUDY IN MICE: Groups of ten male and ten female B6C3F1 mice were exposed to 0, 0.12, 0.25, 0.5, 1, or 2 mg nickel sulfate hexahydrate, 5 days per week for 13 weeks. Additional groups of up to five or six male and female B6C3F1 mice were exposed to 0, 0.12, 0.5, or 2 mg nickel sulfate hexahydrate/m(3)for tissue burden studies. In the core study, four control males, three control females, and one 0.12 mg/m(3)male died before the end of the study; the deaths were not considered to be chemical related, and all other mice survived to the end of the study. The final mean body weights and body weight gains of all exposed groups were similar to those of the controls. There were no chemical-related clinical findings. Hematology changes similar to those reported in female rats occurred in female mice, but the mice were minimally affected. The absolute and relative lung weights of 1 mg/m(3)males and 2 mg/m(3)males and females were significantly greater than those of the controls. Increased numbers of alveolar macrophages occurred in all males and females exposed to 0.5 mg/m(3)or greater. Chronic active inflammation and fibrosis occurred in 1 and 2 mg/m(3)males and females. Lymphoid hyperplasia of the bronchial lymph node and atrophy of the olfactory epithelium in the nasal passages were observed in 2 mg/m(3)males and females. Nickel concentration in the lung of 2 mg/m(3)females was significantly greater than in control animals. 2-YEAR STUDY IN RATS: Groups of 63 to 65 male and 63 to 64 female rats were exposed to nickel sulfate hexahydrate by inhalation at concentrations of 0, 0.12, 0.25, or 0.5 mg/m(3) (equivalent to 0, 0.03, 0.06, or 0.11 mg nickel/m(3)). Animals were exposed for 6 hours plus T90 (8 minutes) 5 days per week for 104 weeks. Five male and five female rats from each group were evaluated at 7 months for histopathology; an additional seven males and seven females from each group were evaluated at 7 months for nickel tissue burden in the lung and kidney; and five males and five females from each group were evaluated at 15 months for alterations in hematology, nickel tissue burden in the lung and kidney, and histopathology. Survival, Body Weights, Clinical Findings, and Hematology The survival rates of all exposed groups of males and females were similar to those of the controls. Mean body weights of 0.5 mg/m(3)female rats were slightly lower (6&percnt; to 9&percnt;) than those of the controls throughout the second year of the study; final mean body weights of all exposed groups of males and 0.12 and 0.25 mg/m(3)females were similar to those of the controls. There were no clinical findings or hematology differences that were considered to be related to nickel sulfate hexahydrate administration. Pathology Findings No exposure-related neoplasms occurred in male or female rats exposed by inhalation to nickel sulfate hexahydrate for 2 years. Increased incidences of inflammatory lung lesions were generally observed in all exposed groups of male and female rats at the end of the study. The incidences of chronic active inflammation, macrophage hyperplasia, alveolar proteinosis, and fibrosis were markedly increased in male and female rats exposed to 0.25 or 0.5 mg/m(3). Increased incidences of lymphoid hyperplasia in the bronchial lymph nodes occurred in 0.5 mg/m(3)male and female rats at the end of the 2-year study. The incidences of atrophy of the olfactory epithelium in 0.5 mg/m(3)males and females were significantly greater than those in controls at the end of the study. Tissue Burden Analyses Lung nickel burdens in exposed male and female rats were greater than those in the controls at the 7- and 15-month interim evaluations, and lung nickel burdens values increased with increasing exposure concentration. 2-YEAR STUDY IN MICE: Groups of 80 male and 80 female mice were exposed to nickel sulfate hexahydrate by inhalation at concentrations of 0, 0.25, 0.5, or 1 mg/m(3) (equivalent to 0, 0.06, 0.11, or 0.22 mg nickel/m(3)). Animals were exposed for 6 hours plus T90 (8 minutes) 5 days per week for 104 weeks. Five male and five female mice from each group were evaluated at 7 months for histopathology; five males and five females from each group were evaluated at 7 months for nickel tissue burden in the lung and kidney; five males and five females from each group were evaluated at 15 months for alterations in hematology and histopathology; and five males and five females from each group were evaluated at 15 months for nickel tissue burden in the lung and kidney. Survival, Body Weights, Clinical Findings, and Hematology The survival rates of all exposed groups of males and females were similar to those of the controls. The mean body weights of 1 mg/m(3)males and of all exposed groups of females were lower than those of the controls during the second year of the study. There were no clinical findings or hematology differences considered to be related to chemical exposure. Pathology Findings Inflammatory lesions of the lung generally occurred in all exposed groups of male and female mice at the end of the 2-year study. These lesions included macrophage hyperplasia, chronic active inflammation, bronchialization (alveolar epithelial hyperplasia), alveolar proteinosis, and infiltrating cells in the interstitium. Incidences of macrophage hyperplasia and/or lymphoid hyperplasia occurred in the bronchial lymph nodes of most of the 1 mg/m(3)males and females and in some 0.5 mg/m(3)females at the end of the 2-year study. Atrophy of the olfactory epithelium was observed in 0.5 and 1 mg/m(3)males and in all exposed groups of females at the end of the 2-year study. Tissue Burden Analyses At the 7- and 15-month interim evaluations, lung nickel burden parameters measured in control and exposed groups were below the limit of detection. Absolute lung weights of 0.5 and 1 mg/m(3)lung burden study females were significantly greater than those of the controls at 15 months. GENETIC TOXICOLOGY: Nickel sulfate hexahydrate (500 to 800 g/mL) was tested for induction of trifluorothymidine resistance in L5178Y mouse lymphoma cells. A positive response was observed in the absence of S9. The test was not performed with S9. CONCLUSIONS: Under the conditions of these 2-year inhalation studies, there was no evidence of carcinogenic activity of nickel sulfate hexahydrate in male or female F344/N rats exposed to 0.12, 0.25, or 0.5 mg/m(3) (0.03, 0.06, or 0.11 mg nickel/m(3)). There was no evidence of carcinogenic activity of nickel sulfate hexahydrate in male or female B6C3F1 mice exposed to 0.25, 0.5, or 1 mg/ m3 (0.06, 0.11, or 0.22 mg nickel/m(3)). Exposure of rats to nickel sulfate hexahydrate by inhalation for 2 years resulted in increased incidences of chronic active inflammation, macrophage hyperplasia, alveolar proteinosis, and fibrosis of the lung; lymphoid hyperplasia of the bronchial lymph node; and atrophy of the olfactory epithelium. Exposure of mice to nickel sulfate hexahydrate by inhalation for 2 years resulted in increased incidences of chronic active inflammation, bronchialization (alveolar epithelial hyperplasia), macrophage hyperplasia, interstitial infiltration, and alveolar proteinosis of the lung; lymphoid and macrophage hyperplasia of the bronchial lymph node; and atrophy of the olfactory epithelium. Synonyms: Blue salt; hexahydrate, nickel (2+) salt; nickel monosulfate hexahydrate; nickel (2+) sulfate hexahydrate; nickel (II) sulfate hexahydrate; nickel sulphate hexahydrate; nickelous sulfate hexahydrate; nickelous sulphate hexahydrate; single nickel salt, sulfuric acid
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PMID:NTP Toxicology and Carcinogenesis Studies of Nickel Sulfate Hexahydrate (CAS No. 10101-97-0) in F344 Rats and B6C3F1 Mice (Inhalation Studies). 1258 12

Lesions are described in farmed Penaeus monodon affected with a previously unreported, fatal disease, 'peripheral neuropathy and retinopathy' (PNR). Outbreaks, associated with minor to heavy mortalities, occurred in 22 of 25 ponds on a farm in eastern Australia during the mid to late 1998/99 growout period. Moribund prawns, 5 to 26 g mean body weight, gathered at pond edges and were typically reddish in colour, lethargic, with mild to moderate epibiotic fouling and 1 or more partially amputated appendages. Histologically, there was mild to severe, focal to diffuse degeneration and necrosis of axons and their sheaths, together with associated glial cell apoptosis, in peripheral nerve fibres. Of the 3 appendage types examined systematically, these pathognomonic lesions were most common and severe in proximal antennal nerves and less common and severe in distal antennal nerves, antennular nerves and pereiopod nerves. Mild to severe, acute to chronic retinitis, associated with degeneration and necrosis of retinular cells and their axons, was also present in most clinically affected prawns. Transmission electron microscopy revealed moderate to large numbers of intracytoplasmic rod-shaped, helical nucleocapsids and enveloped virions, morphologically consistent with a yellow head-like virus, in putative glial cells in the antennal nerve, in the fasciculated zone of the eye and in putative sensory nerve cells of antennules. Immunohistochemical examination revealed lesions, but not histologically normal tissues, in peripheral nerves, eyes, lymphoid organ and vas deferens that consistently stained positively for a yellow head-related virus. The findings strongly suggest that a yellow head-related virus such as the Australian gill-associated virus (GAV) is causally associated with PNR. It is likely that PNR was not recognised during earlier investigations of mid-crop mortalities of farmed P. monodon in eastern Australia because appropriate peripheral nerves and eyes were not routinely examined histologically.
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PMID:Fatal, virus-associated peripheral neuropathy and retinopathy in farmed Penaeus monodon in eastern Australia. I. Pathology. 1269 Nov 89

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