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Systemic and Cardiac Amyloidosis in Captive Celebes Crested Macaques (Macaca nigra). J Comp Pathol 2022; 199:12-16. [DOI: 10.1016/j.jcpa.2022.09.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 07/06/2022] [Accepted: 09/16/2022] [Indexed: 11/26/2022]
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Pyelonephritis and Cystic Endometrial Hyperplasia in a Captive Sunda Pangolin (Manis javanica). J Comp Pathol 2021; 184:101-105. [PMID: 33894871 DOI: 10.1016/j.jcpa.2021.03.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Revised: 01/12/2021] [Accepted: 03/07/2021] [Indexed: 11/29/2022]
Abstract
The Sunda pangolin (Manis javanica) is one of the most trafficked animal species globally, and is listed as Critically Endangered by the IUCN. There is limited information on reproductive biology or pathology of this species. We now document the clinical and pathological features of pyelonephritis and cystic endometrial hyperplasia in one of these animals. Ultrasonographic examination revealed pathological changes in the kidneys and uterus. On histopathological examination, there was marked interstitial infiltration of macrophages, neutrophils and lymphocytes in kidney tissue, fibrinonecrotic ureteritis and mild endometrial hyperplasia. This first report of these urogenital lesions in this species will be valuable for the conduct of health and reproductive assessments of the Sunda pangolin, which inform conservation and ex-situ management of this species.
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Plasma Macrophage Colony-Stimulating Factor and P-Selectin Levels in Malaria-Associated Thrombocytopenia. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1655955] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
SummaryThrombocytopenia is a common finding in malaria. In clinical trials, recombinant macrophage colony-stimulating factor (M-CSF) causes a reversible, dose-dependent thrombocytopenia, and high M-CSF has been reported in autoimmune thrombocytopenias. P-selectin, which is secreted into the plasma following platelet/endothelial activation or damage, is elevated in certain consumptive thrombocytopenic disorders. The relationships between thrombocytopenia, M-CSF and P-selectin were analysed in 63 patients with severe (n = 13) or uncomplicated (n = 26) P. falciparum (PF) or P. vivax (PV) malaria (n = 24). On admission, 69% of PF patients and 75% of PV patients were thrombocytopenic (platelets < 150 X 109/1). M-CSF was elevated in PF (3021 ± 1844 pg/ml) and PV (2602 ± 1668 pg/ml) patients, compared to controls (589 ± 200 pg/ml). The platelet count was inversely correlated with M-CSF in PF (r = -0.681), and in PV malaria (r = -0.548). Elevated P-selectin was found in severe PF malaria, but not in PV malaria. Severe PF malaria was associated with marked thrombocytopenia, very high M-CSF, elevated P-selectin and compelling evidence of disseminated intravascular coagulopathy (DIC). Platelet counts, M-CSF and P-selectin returned to control values in 7-14 days. These data suggest that elevated M-CSF in malaria, by enhancing macrophage activity, may result in increased macrophage-mediated platelet destruction. Further, platelet/endothelial activation or damage, as measured by P-selectin, or DIC could intensify thrombocytopenia in severe PF malaria, but does not appear to contribute to thrombocytopenia in uncomplicated PF or PV malaria.
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Streptococcus agalactiae outbreaks in cultured golden pomfret, Trachinotus blochii (Lacépède), in Singapore. JOURNAL OF FISH DISEASES 2017; 40:971-974. [PMID: 28000924 DOI: 10.1111/jfd.12570] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 09/19/2016] [Accepted: 09/20/2016] [Indexed: 06/06/2023]
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Expression of immunogenic structural proteins of cyprinid herpesvirus 3 in vitro assessed using immunofluorescence. Vet Res 2016; 47:8. [PMID: 26742989 PMCID: PMC4705813 DOI: 10.1186/s13567-015-0297-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 05/10/2015] [Indexed: 12/21/2022] Open
Abstract
Cyprinid herpesvirus 3 (CyHV-3), also called koi herpesvirus (KHV), is the aetiological agent of a fatal disease in carp and koi (Cyprinus carpio L.), referred to as koi herpesvirus disease. The virus contains at least 40 structural proteins, of which few have been characterised with respect to their immunogenicity. Indirect immunofluorescence assays (IFAs) using two epitope-specific monoclonal antibodies (MAbs) were used to examine the expression kinetics of two potentially immunogenic and diagnostically relevant viral antigens, an envelope glycoprotein and a capsid-associated protein. The rate of expression of these antigens was determined following a time-course of infection in two CyHV-3 susceptible cell lines. The results were quantified using an IFA, performed in microtitre plates, and image analysis was used to analyse confocal micrographs, enabling measurement of differential virus-associated fluorescence and nucleus-associated fluorescence from stacks of captured scans. An 8-tenfold increase in capsid-associated protein expression was observed during the first 5 days post-infection compared to a ≤ 2-fold increase in glycoprotein expression. A dominant protein of ~100 kDa reacted with the capsid-associated MAb (20F10) in western blot analysis. This band was also recognised by sera obtained from carp infected with CyHV-3, indicating that this capsid-associated protein is produced in abundance during infection in vitro and is immunogenic to carp. Mass spectrometry carried out on this protein identified it as a previously uncharacterised product of open reading frame 84. This abundantly expressed and immunogenic capsid-associated antigen may be a useful candidate for KHV serological diagnostics.
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Identification of a novel cyprinid herpesvirus 3 genotype detected in koi from the East Asian and South-East Asian Regions. JOURNAL OF FISH DISEASES 2015; 38:915-923. [PMID: 25297376 DOI: 10.1111/jfd.12305] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 07/29/2014] [Accepted: 07/29/2014] [Indexed: 06/04/2023]
Abstract
Cyprinid herpesvirus 3 (CyHV-3) is a highly contagious virus that causes significant morbidity and mortality in common carp Cyprinus carpio L. and considered to be one of the most important pathogens of koi and common carp worldwide. Cyprinid herpesvirus 3 infected consignments imported from East Asian and South-East Asian regions were identified during quarantine period in Singapore, and virus from a 2005 consignment was successfully isolated in koi fin cells. A combination of sequence analyses and duplex PCR were used to characterize 15 CyHV-3 isolates detected in koi consignments between 2005 and 2011. Sequence analyses of the enlarged 9/5, SphI-5 and TK gene regions identified both the Asian 1 (n = 11) and European 4 (n = 4) genotypes. Duplex PCR analysis of two variable marker regions between ORF29 and ORF30 (marker I) as well as ORF133 and its upstream region (marker II) revealed viruses of genotypes J (I++ II+ ), U/I (I-- II- ), an intermediate genotype (I++ II- ) and a novel genotype, I++ II+Δ , which was identified in viruses from seven different consignments. This novel genotype has a 13-bp deletion in marker II, while maintaining the I++ allele of marker I. The I++ II+Δ genotype may have emerged from East Asian and South-East Asian regions in recent years.
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Epstein-Barr virus infection correlates with the expression of COX-2, p16(INK4A) and p53 in classic Hodgkin lymphoma. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2013; 6:2765-2777. [PMID: 24294363 PMCID: PMC3843257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Accepted: 10/05/2013] [Indexed: 06/02/2023]
Abstract
Classic Hodgkin lymphoma (cHL), a germinal-center related B cell neoplasm in almost all cases, is characterized by scarcity of the neoplastic Hodgkin/Reed-Sternberg (H/RS) cells. Epstein-Barr virus (EBV) has been shown to affect cell cycle and regulation of apoptosis. In total, 95 cases of cHL were studied. Five-micrometer sections were prepared and stained with hematoxylin and eosin and immunohistochemical streptavidin-biotin methods for EBV-LMP-1, COX-2, p53, p16, ki-67 and cleaved caspase-3. In-situ hybridization for EBV encoded RNA was used to confirm the detection of EBV in H/RS. There were 49 nodular sclerosis, 32 mixed cellularity, 8 lymphocyte-rich, and 6 lymphocyte-depleted subtypes in this series of cases. EBV, COX-2, p16(INK4A) and p53 were detected in 55% (52/95), 64% (61/95), 62% (59/95), and 65% (62/95) of the cases respectively. EBV was detected in 62% (38/61), 70% (41/59), and 69% (43/62) of COX2, p16 and p53 positive cases respectively. On the other hand, EBV-non-infected cases of cHL are associated with 59% (20/34), 69% (25/36), and 73% (24/33) of COX2, p16 and p53 negative cases respectively. In conclusion, EBV infection is associated with the expression of COX-2, p16(INK4A) and p53. EBV might be the dominant factor in determining the expression of these three proteins.
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012 This is a case series of six patients who presented with posterior reversible encephalopathy syndrome. The aim is to understand these clinicoradiological features of PRES and its management. J Neurol Psychiatry 2012. [DOI: 10.1136/jnnp-2011-301993.54] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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The teaching of pathology. ANNALS OF THE ACADEMY OF MEDICINE, SINGAPORE 2005; 34:87C-89C. [PMID: 16010385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
A/Professor Chong Siew Meng relates the teaching of Pathology in the Medical School since 1905. The Pathology Department of the College of Medicine is closely associated with the Department of Pathology of the Government Medical Service. Pathologists in the Government Medical Service taught medical students till 1955 when the chair of Pathology was filled by Professor R Kirts. Undergraduates and postgraduate teaching and research in the department are described briefly.
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Abstract
This report describes a patient with a gastric biopsy specimen showing histomorphological and immunohistochemical appearances indistinguishable from those usually present in lymphocytic gastritis, a rare condition of unknown aetiology with a distinctive phenotype. The patient had a history of a biopsy confirmed T cell non-Hodgkin lymphoma at two anatomical sites (bladder and stomach), which was subsequently treated. Molecular analysis of the T cell receptor (TCR) gamma chain gene rearrangements showed a distinct monoclonal T cell population in the bladder and gastric biopsies. The same analysis in the lymphocytic gastritis-like biopsy sample showed a monoclonal population with identical base pair size to that identified in the other specimens. This report highlights the importance of TCR gene rearrangement analysis in the diagnosis of unusual gastric inflammation, and the use of capillary electrophoresis based polymerase chain reaction in the follow up of lymphoproliferative disorders.
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Abstract
The natural history of spontaneous osteonecrosis of the medial tibial plateau remains controversial and incomplete. We have studied 21 patients (aged between 53 and 77 years) with clinical and scintigraphic features of spontaneous osteonecrosis of the medial tibial plateau who were observed prospectively for at least three years (37 months to 8.5 years). The mean duration of follow-up was 5.6 years. The mean duration of symptoms at presentation was 4.7 weeks (3 days to 12 weeks). Radiographs of the affected knee at the first visit were normal in 15 patients and mildly arthritic in six. The characteristic radiographic lesion of osteonecrosis was noted at presentation in five of the mildly arthritic knees and during the evolution of the disease in eight of the radiographically normal knees. During the follow-up, subchondral sclerosis of the affected medial tibial plateau was noted in 16 knees. There are three distinct patterns of outcome: 1) acute extensive collapse of the medial tibial plateau in two knees within three months of onset; 2) rapid progression to varying degrees of osteoarthritis in 12 knees, in eight within a year, in all within two years and deterioration of the pre-existing osteoarthritis in three; and 3) complete resolution in four knees, two of which were normal at presentation and two mildly osteoarthritic. The two patients with acute extensive collapse and three who had rapid progression to severe osteoarthritis required total knee arthroplasty. We conclude that osteonecrosis of the medial tibial plateau progresses in most cases to significant degenerative disease of the knee.
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Abstract
A 34-year-old lady developed a constellation of dermatitis, fever, lymphadenopathy and hepatitis, beginning on the 17th day of a course of oral sulphasalazine for sero-negative rheumatoid arthritis. Cervical and inguinal lymph node biopsies showed the features of severe necrotising lymphadenitis, associated with erythrophagocytosis and prominent eosinophilic infiltrates, without viral inclusion bodies, suggestive of an adverse drug reaction.A week later, fulminant drug-induced hepatitis, associated with the presence of anti-nuclear autoantibodies (but not with other markers of autoimmunity), and accompanied by multi-organ failure and sepsis, supervened. She subsequently died some 5 weeks after the commencement of her drug therapy.Post-mortem examination showed evidence of massive hepatocellular necrosis, acute hypersensitivity myocarditis, focal acute tubulo-interstitial nephritis and extensive bone marrow necrosis, with no evidence of malignancy. It is thought that the clinico-pathological features and chronology of this case bore the hallmarks of the so-called "3-week sulphasalazine syndrome", a rare, but often fatal, immunoallergic reaction to sulphasalazine.
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A distinct expression of CC chemokines by macrophages in nasopharyngeal carcinoma: implication for the intense tumor infiltration by T lymphocytes and macrophages. Hum Pathol 2001; 32:42-9. [PMID: 11172294 DOI: 10.1053/hupa.2001.20886] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Nasopharyngeal carcinoma (NPC) is characterized by harboring Epstein-Barr virus genes in the tumor cells and an intense infiltration of leukocytes in the tumor tissue. These infiltrating cells are mainly composed of T lymphocytes and macrophages. The mechanism of this intense infiltration has long been a puzzle. We attempted to address this issue by studying the expression of CC chemokines, which are responsible for recruiting both T cells and macrophages, by an immunohistochemical approach. In biopsies obtained from nasopharynx of 17 NPC patients that contained tumor cells, expression of macrophage inflammatory protein 1alpha (MIP-1alpha), MIP-1beta, macrophage chemoattractant protein-1 (MCP-1), MCP-2, MCP-3, and RANTES was detected in the tumor-infiltrating cells, with MIP-1alpha and MCP-1 found in nearly all biopsies and the others relatively less frequently. Furthermore, expression of interferon-gamma (IFN-gamma) was also observed in tumor-infiltrating cells. In contrast, CC chemokines and IFN-gamma were rarely expressed in the 13 control biopsies that were either normal or with nonspecific inflammation, and in 4 biopsies from untreated NPC patients that contained no tumor cells. Using an immunofluorescent double-staining method, MIP-1alpha and MCP-1 were identified to be associated with macrophages, and IFN-gamma with T cells. Moreover, expression of CCR2 and CCR5, the receptors for these chemokines, was also detected in the tumor-infiltrating cells. These data indicate that the intense tumor infiltration by T cells and macrophages is a result of active recruitment. It seems possible that the intense infiltration of leukocytes in NPC tumor tissue is initiated by the activated tumor-reactive T cells. T cells migrate into the tumor tissue in an antigen-specific mode, and IFN-gamma secreted from these pioneer T cells activates tissue macrophages to express CC chemokines, especially MIP-1alpha and MCP-1, which consequently recruit more T cells and macrophages into the tumor tissue.
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MESH Headings
- Antibodies, Viral/blood
- Chemokines, CC/biosynthesis
- Herpesvirus 4, Human/genetics
- Herpesvirus 4, Human/immunology
- Humans
- Immunoglobulin A/blood
- Immunohistochemistry
- In Situ Hybridization
- Interferon-gamma/biosynthesis
- Lymphocytes, Tumor-Infiltrating/chemistry
- Lymphocytes, Tumor-Infiltrating/pathology
- Macrophages/chemistry
- Macrophages/pathology
- Nasopharyngeal Neoplasms/immunology
- Nasopharyngeal Neoplasms/metabolism
- Nasopharyngeal Neoplasms/pathology
- RNA, Viral/genetics
- Receptors, CCR2
- Receptors, CCR5/biosynthesis
- Receptors, Chemokine/biosynthesis
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Abstract
BACKGROUND Haptoglobin knockout (Hp-/-) mice are more sensitive to phenylhydrazine-induced hemolysis than Hp+/+ mice. METHODS Hemolysis was induced in Hp-/- and Hp+/+ mice using phenylhydrazine. Relative renal tissue damage and function were then assessed. RESULTS Hp-/- mice had higher basal levels of renal lipid peroxidation, as evidenced by levels of malonaldehyde and 4-hydroxy-2(E)-nonenal (MDA/HNE). After the administration of phenylhydrazine, levels of 8-hydroxyguanine (but not other products of oxidative DNA damage) were significantly elevated in the renal DNA. There was also increased induction of heme oxygenase-1. The more severe renal damage in Hp-/- mice was also evident in the delayed erythropoietin gene expression and poorer renal clearance of 3H-inulin. This reduction in glomerular filtration function in Hp+/+ and Hp-/- mice could be restored to baseline by vasodilators (prazosin or diazoxide), implicating renal vasoconstriction as a major mechanism of acute renal failure during induced hemolysis. Precipitation of hemoglobin in the kidney was not increased in Hp-/- mice. CONCLUSIONS Haptoglobin appears to play an important physiological role as an antioxidant, particularly during hemolysis.
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Duodenal ulcer perforation following cyanoacrylate injection. Endoscopy 2000; 32:S23. [PMID: 10817190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
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X-chromosome inactivation analysis of isolated Reed-Sternberg cells in nodular sclerosing Hodgkin's disease. Br J Haematol 1999; 107:641-7. [PMID: 10583270 DOI: 10.1046/j.1365-2141.1999.01727.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In spite of several studies of immunoglobulin (Ig) gene rearrangements in whole Hodgkin's disease (HD) tissues and in isolated single Reed-Sternberg (RS) cells, the issue of clonality of the RS cell in HD remains incompletely resolved. Analysis of X-chromosome inactivation patterns (XCIPs) can be used to determine whether cell populations are clonal in origin. By PCR amplification of the human androgen receptor (HUMARA) loci using nested primers, we have studied XCIPs in six cases of HD of the nodular sclerosing (NS) subtype in which individual RS cells were isolated by micromanipulation from formalin-fixed, paraffin-embedded tissue sections immunostained with CD30 or CD15. In order to assess whether a clonal population of RS cells might be present in NSHD tissues, we compared the XCIPs obtained from whole NSHD tissues with those obtained from single RS cells harvested from the same tissues. Whole tissues from all six cases of NSHD showed balanced HUMARA allelic patterns, whereas an average of 83% (range 77-91%) of single RS cells from each of the six tissues expressed the same high- or low-molecular weight allele, suggesting that a clonal population of RS cells was likely to be present in each case. These data are consistent with the presence of a clonal population of RS cells in NSHD tissues.
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Splenic actinomycosis. JOURNAL OF THE ROYAL COLLEGE OF SURGEONS OF EDINBURGH 1999; 44:344-5. [PMID: 10550960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
We report a rare case of abdominal actinomycosis occurring in the spleen and review the literature on abdominal actinomycosis.
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School-administered weekly iron-folate supplements improve hemoglobin and ferritin concentrations in Malaysian adolescent girls. Am J Clin Nutr 1999; 69:1249-56. [PMID: 10357747 DOI: 10.1093/ajcn/69.6.1249] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Iron deficiency and its consequent anemia constitute the commonest micronutrient deficiency in the world. OBJECTIVE We investigated whether long-term, weekly iron-folate supplements administered at school would improve hemoglobin and ferritin concentrations in adolescent girls, including those with mild-to-moderate anemia and hemoglobin concentrations indicating borderline anemia. DESIGN Subjects were 266 girls with hemoglobin concentrations of 80-119.9 g/L (group A) and 358 girls with hemoglobin concentrations of 120-130 g/L (group B) who were otherwise healthy. Two hundred sixty-six girls in group A and 268 girls in group B were randomly assigned to receive either 60 or 120 mg Fe plus 3.5 mg folic acid weekly for 22 wk. Ninety of the girls in group B were randomly assigned to receive only 5 mg folic acid weekly. Capillary hemoglobin and plasma ferritin were measured at baseline and after 12 and 22 wk of supplementation. RESULTS By the end of the study, 2% of the girls had dropped out and > 96% had taken > or = 20 of the 22 tablets; side effects were minimal. Mean plasma ferritin increased significantly in all iron-supplemented groups, independently of initial hemoglobin values and iron doses. Ferritin concentrations decreased in the girls supplemented with folic acid only. As expected, hemoglobin responses to iron were higher in group A than in group B and increases were positively correlated with initial plasma ferritin. Hemoglobin failed to respond to folate supplementation if initial plasma ferritin concentrations were low. Mean hemoglobin increased significantly and consistently in relation to the length of treatment. CONCLUSION Long-term, weekly iron-folate supplementation was found to be a practical, safe, effective, and inexpensive method for improving iron nutrition in adolescent schoolgirls.
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Increased production of interferon-gamma by tumour infiltrating T lymphocytes in nasopharyngeal carcinoma: indicative of an activated status. Cancer Lett 1999; 140:93-8. [PMID: 10403546 DOI: 10.1016/s0304-3835(99)00056-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Undifferentiated nasopharyngeal carcinomas (UNPC) are characterised by an association with Epstein-Barr virus and an abundant lymphoid stroma. We studied the functional status of the infiltrating T cells in ten UNPC biopsies using an immunohistochemical approach. Twelve non-NPC biopsies were included as controls. Tumour cells of UNPC were positive for HLA class I (10/10) and II (8/10), LMP1 (3/10), and CD86 (6/10). Tumour infiltrating T cells (TILs) were detected with antibodies directed at CD3, CD4, and CD8, and shown to be comparable to that in the control biopsies. Although expression of CD28 was shown to be decreased in TILs, expression of CD25 and IFN-gamma at a relatively high percentage could be consistently detected in the UNPC biopsies. These data suggest that TILs in UNPC are in an activated status, and this T cell response is possibly directed at the tumour cells.
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Small cell neuroendocrine carcinoma of the cervix with involvement of multiple pelvic nodes--A successfully treated case by multimodal approach. Gynecol Oncol 1999; 72:246-9. [PMID: 10021309 DOI: 10.1006/gyno.1998.5214] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Small cell neuroendocrine carcinoma of the cervix is very rare and is usually associated with dismal prognosis if treated by conventional surgery and radiotherapy even in early stage disease. This tumor is characterized by early lymphatic and hematogenous spread. Only one successfully treated case of small cell neuroendocrine carcinoma of the cervix with dissemination to the pelvic nodes had been reported before in the literature. We are reporting a case of small cell neuroendocrine carcinoma of the cervix with multiple pelvic nodal metastases including the common iliac nodes, which had been successfully treated with a multimodal approach including radical hysterectomy, pelvic/para-aortic lymphadenectomy, and postoperative chemotherapy using cisplatin-etoposide combinations and pelvic irradiation.
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Characteristics and prognosis of KI-1 positive anaplastic large cell lymphoma in Asians. AUSTRALIAN AND NEW ZEALAND JOURNAL OF MEDICINE 1998; 28:790-4. [PMID: 9972408 DOI: 10.1111/j.1445-5994.1998.tb01555.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Ki-1 positive anaplastic large cell lymphoma is a rare type of non-Hodgkin's lymphoma (NHL), and has not been extensively described in Asian patients. AIM To evaluate the clinical characteristics, prognostic factors and treatment outcome of Ki-1 positive lymphoma in an Asian community. METHODS A retrospective analysis of all patients with CD30 antigen positive anaplastic large cell lymphoma from 1987 to 1996 in a single institution. RESULTS Of 218 patients with NHL, ten (5%) were identified with Ki-1 positive anaplastic large cell lymphoma. Eight were Chinese, two Indians. The male:female ratio was 1.5:1, and the median age was 32 years. Seven patients presented with B-symptoms, and five had stage III/IV disease. The majority (seven of ten) was low- or low-intermediate risk according to the International Prognostic Index (IPI). Four out of five cases immunophenotyped showed a T-cell origin. Five out of eight patients who received first-line combination chemotherapy achieved a complete remission. Two relapsed, with one being re-induced into a durable second remission. One patient with recurrent cutaneous lymphoma received solely radiotherapy and was disease-free at 20+ years from diagnosis. At analysis, two patients had died, five were disease-free at four, 27, 78, 89 months and 20 years respectively, and three were alive with disease. The IPI appears to have prognostic significance. CONCLUSION Incidence and clinical characteristics in our Asian patients were similar to those described in Western populations. The IPI appears to have prognostic relevance. In approximately one-third of patients, long term survival can be achieved with standard treatment.
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Increased susceptibility in Hp knockout mice during acute hemolysis. Blood 1998; 92:1870-7. [PMID: 9731043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Haptoglobin, a conserved plasma glycoprotein, forms very stable soluble complexes with free plasma hemoglobin. Hemoglobin binding by haptoglobin is thought to be important in the rapid hepatic clearance of hemoglobin from the plasma and in the inhibition of glomerular filtration of hemoglobin. To evaluate these functions, Haptoglobin knockout (-/-) mice were created. These mice were viable but had a small, significant reduction in postnatal viability. Contrary to popular belief, the lack of haptoglobin did not impair clearance of free plasma hemoglobin in -/- mice. Induction of severe hemolysis by phenylhydrazine caused extensive hemoglobin precipitation in the renal tubular cells of both -/- and +/+ mice, with death occurring in 55% of -/- mice and in 18% of +/+ mice. In general, phenylhydrazine-treated -/- mice suffered greater tissue damage, as evidenced by the induction of hepatic acute phase response resulting in increased plasma alpha 1-acid glycoprotein (AGP) levels. Among -/- and +/+ mice that survived, -/- mice tend to suffer greater oxidative damage and failed to repair or regenerate damaged renal tissues, as indicated by their higher plasma malonaldehyde (MDA) and 4-hydroxy-2(E)-nonenal (HNE) levels and lower mitotic indices in their kidneys, respectively. This study suggested that a physiologically important role of hemoglobin-haptoglobin complex formation is the amelioration of tissue damages by hemoglobin-driven lipid peroxidation.
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Malignant ovarian germ cell tumours: experience in the National University Hospital of Singapore. ANNALS OF THE ACADEMY OF MEDICINE, SINGAPORE 1998; 27:657-61. [PMID: 9919335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Management of thirteen cases of malignant ovarian germ cell tumours was reported. Of these, 5 (38%) were immature teratoma, 3 (23%) were endodermal sinus tumour, 1 (8%) was dysgerminoma and 4 (31%) were mixed germ cell tumour. Eight (61%) had stage I, 1 (8%) had stage II and 4 (31%) had stage III diseases. Six had unilateral salpingo-oophorectomy, 6 had total abdominal hysterectomy and bilateral salpingo-oophorectomy and 1 had bilateral oophorectomy. Ten (77%) had adjuvant chemotherapy predominantly with bleomycin/etoposide/cisplatin combination. All patients with stage I and stage II tumours were alive with no evidence of disease at 1/2 year to 5 years followup. Of the 4 patients with stage IIIC diseases, 2 with optimal debulking surgery were alive and disease free at 4 and 7 years after surgery. The other 2 patients with stage IIIC tumours had multiple bulky residual tumours. One of them with a combination of endodermal sinus tumour and embryonal carcinoma died of progressive disease despite chemotherapy 6 months after surgery and the other with mixed endodermal sinus tumour and dysgerminoma was alive with disease at 6 months. Alpha-fetoprotein levels were raised in all 6 patients with endodermal sinus tumour, either pure or combined with other tumours. Regression of alpha-fetoprotein levels was of important prognostic significance in endodermal sinus tumour.
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Splenic lymphoma with villus lymphocytes--an uncommon cause for lymphocytosis. Singapore Med J 1997; 38:395-8. [PMID: 9407767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We describe the clinical and laboratory features of four patients who presented with mild to moderate lymphocytosis but with no peripheral lymphadenopathy. These patients in the past, would have been classified as chronic lymphocytic leukaemia (CLL). However, it is now realised that chronic lymphoproliferative disorders are very heterogeneous and the clinical and laboratory features of our patients would support a diagnosis of splenic lymphoma with villus lymphocytes (SLVL) with characteristic morphological features. SLVL usually runs a benign clinical course but symptoms related a benign clinical course but symptoms related to splenomegaly or hypersplenism may be a problem. Splenectomy is considered the treatment of choice in these patients. Two of our patients had splenectomy and the other two patients are on regular follow-up without any specific treatment. It is therefore important to recognise this uncommon condition and also to differentiate it from CLL.
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Abstract
In the assessment of malignant potential of ovarian tumours, frozen section has been found to be accurate in 97.1% (168 of 173) of cases. The positive predictive value of frozen section in the diagnosis of a malignant lesion was 100% (34 of 34). Errors were mainly made in the diagnosis of borderline tumours with a predictive value of 87.5% (7 of 8). The negative predictive value was 98.4% (127 of 129). Frozen section however, was less accurate in the diagnosis of specific histological type with an accuracy rate of 91.9% (159 of 173). Macroscopic features were found to be useful in the intraoperative prediction of malignant potential. Completely cystic tumours were benign in 96.4% (108 of 167) of cases. Solid/cystic tumors were malignant in 69% (27 of 38) of cases. Completely solid tumours were malignant in 56% (9 of 16) of cases. Frozen section in completely cystic tumours only marginally improved the clinical macroscopic diagnosis of malignancy. The sensitivity and specificity of ultrasound scan in the diagnosis of malignant/borderline tumours were 82% and 86% respectively. The false negative rate of 7% makes laparoscopic excision of unsuspected malignant ovarian cyst a significant possibility. The predictive value of ultrasound scan in the diagnosis of malignant ovarian tumour was 62% (26 of 42). In the preoperative assessment of malignant potential of ovarian tumours, this study shows that ultrasound scan has a high false positive and a significant false negative rate. Careful intraoperative assessment of gross features and the use of frozen section especially in those with solid/cystic and solid tumours will help achieve a high accuracy rate in the assessment of ovarian tumours.
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28
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Plasma macrophage colony-stimulating factor and P-selectin levels in malaria-associated thrombocytopenia. Thromb Haemost 1997; 77:289-93. [PMID: 9157583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Thrombocytopenia is a common finding in malaria. In clinical trials, recombinant macrophage colony-stimulating factor (M-CSF) causes a reversible, dose-dependent thrombocytopenia, and high M-CSF has been reported in autoimmune thrombocytopenias. P-selectin, which is secreted into the plasma following platelet/endothelial activation or damage, is elevated in certain consumptive thrombocytopenic disorders. The relationships between thrombocytopenia, M-CSF and P-selectin were analysed in 63 patients with severe (n = 13) or uncomplicated (n = 26) P. falciparum (PF) or P. vivax (PV) malaria (n = 24). On admission, 69% of PF patients and 75% of PV patients were thrombocytopenic (platelets < 150 x 10(9)/l). M-CSF was elevated in PF (3021 +/- 1844 pg/ml) and PV (2602 +/- 1668 pg/ml) patients, compared to controls (589 +/- 200 pg/ml). The platelet count was inversely correlated with M-CSF in PF (r = -0.681), and in PV malaria (r = -0.548). Elevated P-selectin was found in severe PF malaria, but not in PV malaria. Severe PF malaria was associated with marked thrombocytopenia, very high M-CSF, elevated P-selectin and compelling evidence of disseminated intravascular coagulopathy (DIC). Platelet counts, M-CSF and P-selectin returned to control values in 7-14 days. These data suggest that elevated M-CSF in malaria, by enhancing macrophage activity, may result in increased macrophage-mediated platelet destruction. Further, platelet/endothelial activation or damage, as measured by P-selectin, or DIC could intensify thrombocytopenia in severe PF malaria, but does not appear to contribute to thrombocytopenia in uncomplicated PF or PV malaria.
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29
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Aspiration cytology of liver abscesses. With an emphasis on diagnostic pitfalls. Acta Cytol 1995; 39:453-62. [PMID: 7762332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Clinical and imaging features of liver abscesses are not specific. Necrotic hepatic neoplasms, primary or secondary, can mimic abscesses, and vice versa. Thirty-eight patients who had cytologic confirmed abscesses were analyzed. There was clinical, radiologic and cytologic concurrence in 27 patients. In six cases the clinically suspicious lesion turned out to be inflammatory. The remaining five were malignant. There were four amebic and three tuberculous cases in this series. Cytologically, pyogenic abscesses contained a heavy, neutrophilic, inflammatory exudate with nuclear debris. By comparison, amebic cases contained more necrotic debris, with degenerating hepatocytes and fewer inflammatory cells. Acid-fast bacilli were identified in two tuberculous abscesses; however, only one contained caseous necrotic material and epithelioid cells. A potential pitfall in the cytologic diagnosis of a case of inflammatory pseudotumor is emphasized. The diagnosis of liver abscess should be established by clinical and imaging findings in conjunction with needle aspiration.
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30
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Retroperitoneal endodermal sinus tumor. Report of a case with an abnormal cervicovaginal smear. Acta Cytol 1994; 38:562-7. [PMID: 8042423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
An unusual case of an endodermal sinus tumor arising in the retroperitoneum and invading the fallopian tube is reported. The patient presented with malignant cells mimicking adenocarcinoma in the cervicovaginal smear. The differential diagnoses of such cells in cervicovaginal cytology are discussed. The cytohistologic, immunohistochemical and ultrastructural findings of the tumor are correlated.
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31
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An interesting case of intersex: case report. ASIA-OCEANIA JOURNAL OF OBSTETRICS AND GYNAECOLOGY 1994; 20:121-4. [PMID: 8092954 DOI: 10.1111/j.1447-0756.1994.tb00436.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Intersex is a rare problem. Ambiguous genitalia, a frequent presentation of intersex, is seldom due to true hermaphroditism. This case report describes the findings in such a rare case.
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32
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Bilateral carcinoid tumor of the breast. Report of a case with diagnosis by fine needle aspiration cytology. Acta Cytol 1992; 36:55-9. [PMID: 1546512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A case of bilateral carcinoid tumors of the breast was studied by cytology, histology, immunohistochemistry and electron microscopy. The preoperative aspiration cytologic findings strongly suggested a carcinoid tumor of the breast. The differential diagnosis with fine needle aspiration cytology of other breast lesions, the bilaterality of the condition and terminology are discussed.
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33
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A study of the xenogeneic response in an isolated liver perfusion circuit--preliminary observations. ANNALS OF THE ACADEMY OF MEDICINE, SINGAPORE 1991; 20:488-92. [PMID: 1799262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
An isolated liver perfusion circuit was developed to study the xenogeneic reaction of human blood to porcine liver, and investigate the feasibility of using such a system for liver dialysis in fulminant hepatic failure. Three experimental groups were studied: a control group where pooled porcine blood was perfused through pig liver (n = 12), a xenogeneic group where banked human blood was perfused through porcine liver (n = 23), and a modified xenogeneic group where decomplemented human blood was perfused through porcine liver (n = 4). The following parameters of liver function were assessed: liver function tests, serum electrolytes, bile and ascites production. In addition, liver histology was assessed at the start and completion of each perfusion experiment. Control experiments established that the use of low perfusion pressures (mean inlet pressure of 29.5 +/- 7.4 mmHg), and low haematocrit of 20.5 +/- 8.9% (n = 14), enabled five hour perfusions to be consistently achieved with maintenance of normal acid base and electrolyte balance. Bile production over 5 hours was 18.8 +/- 8.0 ml in controls (n = 5) and 17.0 +/- 6.7 ml in the xenogeneic (human-pig) circuit (n = 11) (NS). Ascites production was 235.8 +/- 157.3 ml/hr in controls (n = 5) and 205 +/- 142.0 ml/hr in the xenogeneic circuit (n = 7) (NS).(ABSTRACT TRUNCATED AT 250 WORDS)
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34
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Fetal pig pancreas--a preliminary assessment of tissue for transplantation. ANNALS OF THE ACADEMY OF MEDICINE, SINGAPORE 1991; 20:472-7. [PMID: 1799259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Porcine fetal pancreases (PFP) obtained from 4 pregnant sows were pooled, minced into 1 mm3 fragments and studied in organ culture for up to 30 days to determine tissue viability and insulin production in vitro. After 7-9 days in culture, some of these explants were transplanted into euglycemic, N:NIH-nu(s) nude recipient mice, and studied histologically over 69 days following grafting. Using RPMI 1640 supplemented with 5% fetal calf serum as the culture medium in 90% air/10% CO2, it was found that explants were viable with insulin production detected in vitro, which was maximal at day 7 (197 +/- 18.9 mU/L, n = 11), and gradually declined thereafter. By 22 days, insulin levels were less than 60.1 +/- 28.5 mU/L (n = 6). Histology of the explants showed viable tissue with evidence of mitoses present in insulin-positive cells at day 16 in vitro. Beyond this time, tissue viability diminished. Explants transplanted into euglycemic nude mice did not undergo rejection during the observation period of 69 days. Grafts remained viable with evidence of an increase in mitotic activity in the endocrine tissue on immunoperoxidase staining. These preliminary investigations confirm that pancreatic explants from porcine fetuses can be maintained in culture for up to 16 days. Such explants, when transplanted under the kidney capsule of euglycemic, nude mice, did not undergo necrosis, but remained viable, with evidence of mitoses in the islet tissue.
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35
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Both concordant and discordant heart xenografts are rejected by athymic (nude) rats with the same tempo as in T cell competent animals. Transplant Proc 1991; 23:581-2. [PMID: 1990616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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36
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An analysis of concordant xenograft rejection in the nude rat model. Transplant Proc 1990; 22:2095-6. [PMID: 2219305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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37
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Anaplastic large cell Ki-l lymphoma. Histopathology 1990; 16:315-6. [PMID: 2369457 DOI: 10.1111/j.1365-2559.1990.tb01128.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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38
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Pathology of the 5 most common cancers in Singapore. ANNALS OF THE ACADEMY OF MEDICINE, SINGAPORE 1990; 19:186-200. [PMID: 2161192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Cancers in Singapore are on the rise in recent years. The five most frequent cancers in Singapore are lung, stomach, liver, colo-rectum and nasopharynx in males, and breast, uterine cervix, stomach, lung and colo-rectum in females. This article briefly reviews the pathology of these common cancers with emphasis on local patterns and recent developments.
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39
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Malignant non-Hodgkin's lymphomas of the nose and paranasal sinuses. THE MEDICAL JOURNAL OF MALAYSIA 1988; 43:49-54. [PMID: 3244320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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40
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Abstract
The 36 kDa substrate of several tyrosine protein kinases has been shown to exist in monomeric and oligomeric (362102) forms. Partial sequence data has suggested that the oligomer, referred to as protein I, is homologous to a group of phospholipase A2 inhibitory proteins, collectively called lipocortins. In the present communication we demonstrate that protein I inhibits bovine pancreas phospholipase A2 with similar potency to that of lipocortin. Approximately 44 pmol protein I was required to produce 50% inhibition of 7.2 pmol of phospholipase A2. Inhibition of phospholipase A2 activity by calmodulin, S-100, calregulin, parvalbumin, troponin-C, or CAB-48 was not observed. These results indicate that protein I is a potent and specific inhibitor of phospholipase A2 activity, and thus shares functional homology with the lipocortin proteins. We therefore propose that this protein be named lipocortin-85.
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41
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Leder-Giemsa stain for bone marrow trephine--a technical report. THE MALAYSIAN JOURNAL OF PATHOLOGY 1986; 8:75-9. [PMID: 2446087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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42
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Malignant neoplasms at the Universiti Kebangsaan Malaysia 1980-1984. THE MALAYSIAN JOURNAL OF PATHOLOGY 1986; 8:41-8. [PMID: 3682943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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43
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Abstract
The 36kDa subunit of protein I (p36) is a major substrate of several tyrosine protein kinases. Here we demonstrate that protein kinase C catalyzes the incorporation of 1.7 moles of phosphate per mole of protein I. Phosphorylation is absolutely dependent on the presence of both calcium and phospholipid, and is specific for serine and threonine residues. Phosphorylation of protein I by the c-AMP dependent protein kinase, phosphorylase kinase, casein kinase I, and casein kinase II was not observed. The in vivo significance of protein kinase C dependent phosphorylation of p36 is discussed.
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44
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Acute lymphoblastic leukemia in relapse presenting as a breast lump: a case report. THE MEDICAL JOURNAL OF MALAYSIA 1985; 40:46-8. [PMID: 3868737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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45
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46
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IGA nephropathy--a clinicopathological review of 12 cases seen at the Department of Nephrology, General Hospital, Kuala Lumpur. Singapore Med J 1983; 24:109-12. [PMID: 6612354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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47
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Mesenchymal chondrosarcoma - a case report with brief review of the literature. THE MALAYSIAN JOURNAL OF PATHOLOGY 1982; 5:55-62. [PMID: 7187459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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48
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Pattern of glomerular disease in Malaysia. THE MEDICAL JOURNAL OF MALAYSIA 1981; 36:3-7. [PMID: 7321935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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49
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Extensive crescent formation in idiopathic membranous glomerulonephritis. A case report. THE MEDICAL JOURNAL OF MALAYSIA 1981; 36:8-10. [PMID: 7321940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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