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Biomedical subjects

G Hirose

Publications and source records attributed to G Hirose.

At least 19 recordsLinked to original sources
PubMed2006

Varicose veins associated with CADASIL result from a novel mutation in the Notch3 gene.

No genetically diagnosed cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) pedigrees with venous insufficiency have been described. In a CADASIL pedigree with varicose veins, the authors have identified a novel heterozygous mutation in the 3' splice acceptor site of intron 15 of the Notch3 gene. This, based on mRNA analysis, resulted in skipping of exon 16 including eight cysteine residues of EGF-like repeats.

Adult↗
PubMed2003

Mutation in the CHAC gene in a family of autosomal dominant chorea-acanthocytosis.

Although mutations in the CHAC gene have been identified in autosomal recessive chorea-acanthocytosis (AR-ChAc), the molecular basis of autosomal dominant ChAc (AD-ChAc) remains to be determined. The authors investigated abnormalities in the CHAC gene in an AD-ChAc family with mRNA and sequencing analyses of mRNA and genomic DNA. A novel single heterozygous mutation in the last nucleotide of exon 57 of the CHAC gene, which could cause skipping of the exon, was detected in affected siblings.

Adult↗
PubMed2003

Rostral lateral pontine infarction: neurological/topographical correlations.

The authors correlated neurologic features of rostral lateral pontine infarct (rLPI) with lesion location on MRI. rLPI is a motor-sensory stroke presenting as crural monoparesis or crural dominant hemiparesis and segmental superficial or deep sensory disturbances. The dorsolateral pontine base causes crural paresis without supranuclear facial palsy.

Aged↗
PubMed2003

Anti-Ma2 antibody related paraneoplastic limbic/brain stem encephalitis associated with breast cancer expressing Ma1, Ma2, and Ma3 mRNAs.

A 69 year old woman presented with cognitive impairment and supranuclear gaze palsy caused by paraneoplastic limbic/brain stem encephalitis associated with atypical medullary breast carcinoma. The cerebrospinal fluid from the patient harboured an anti-neuronal cell antibody against Ma2 antigen, but not against Ma1 or Ma3 antigen. Despite the antibody being restricted to the Ma2 antigen, the patient's cancer tissue expressed Ma1, Ma2, and Ma3 mRNAs. These results, and the expression of Ma2 mRNA in an atypical medullar breast carcinoma in another patient without paraneoplastic encephalitis, indicate that the induction of anti-Ma2 antibody depends on host immunoreponsiveness and not on the presence of the antigen itself in the cancer.

Aged↗
PubMed2002

A novel murine myotonia congenita without molecular defects in the ClC-1 and the SCN4A.

The authors report a new murine model for myotonia congenita designated as B6MT. This line spontaneously arose from breeding of transgenic C57BL/6CrSlc mice, irrelevant of the transgene. The B6MT mouse showed moderate to severe action myotonia, and electromyography revealed myotonic discharge. The phenotype was transmitted with autosomal recessive inheritance. Molecular genetic study of the ClC-1 and the SCN4A genes revealed polymorphism with no functional consequences.

Amino Acid Substitution↗
PubMed2001

Suppression of the transcriptional activity and DNA binding of nuclear factor-kappa B by a paraneoplastic cerebellar degeneration-associated antigen.

Paraneoplastic cerebellar degeneration (PCD) associated with gynecological malignancies is a disorder in which an autoimmune mechanism has been suggested, and both antibody- and cell-mediated immune responses exist against pcd17/cdr2, a neural protein expressed in cerebellar Purkinje neurons and brainstem neurons. In this report, we describe that pcd17 can suppress the basal or activated NF-kappaB-dependent transcriptional activity in a co-transfection study. The DNA binding of constitutive NF-kappaB complexes decreased in the nucleus of TNF-alpha-stimulated neuroblastoma cells, though pcd17 does not bind to classical NF-kappaB consensus site. These data indicate that pcd17 is a potential repressor for NF-kappaB-dependent gene transcription in neurons.

Animals↗
PubMed2001

Induction of major histocompatibility complex class I molecules on human neuroblastoma line cells by a flavoid antioxidant.

Human major histocompatibility complex (MHC) class I expression is usually suppressed in neuronal cells and neuroblastoma cells. In the present study, we analyzed the effect of a flavonoid antioxidant, silymarin, on the induction of MHC class I molecules in human neuroblastoma line cells. Treatment of neuroblastoma cells with silymarin resulted in the expression of MHC class I molecules. Silymarin treatment enhanced the transcriptional activity of the reporter construct containing MHC class I promoter truncated within -428 bp of transcription initiation, but not the construct containing the promoter truncated within -284 bp. Because an E-box element is located between -428 and -285 bp of the transcription initiation, results suggest that silymarin acts on the enhancer activity of the E-box in the MHC class I promoter. Our findings indicate that silymarin induces the transcriptional factors to enhance the MHC class I promoter through the class I E-box element.

Antioxidants↗
PubMed2001

A case of familial amyloid polyneuropathy homozygous for the transthyretin Val30Met gene with motor-dominant sensorimotor polyneuropathy and unusual sural nerve pathological findings.

OBJECTIVE: To report a case of familial amyloid polyneuropathy homozygous for the amyloidogenic transthyretin (ATTR) Val30Met gene with motor-dominant sensorimotor polyneuropathy and unusual sural nerve pathological findings. METHODS: Mass spectrometry analysis and polymerase chain reaction-restricting fragment length polymorphism were performed. A right sural nerve biopsy specimen was obtained for histological investigation. SETTING: Academic medical center. RESULTS: A 56-year-old Japanese man living in a local town (Nakajima, Japan) in Ishikawa Prefecture, a nonendemic area of type I familial amyloidotic polyneuropathy, had vitreous amyloidosis, motor-dominant sensorimotor polyneuropathy, erectile dysfunction, and urinary incontinence. He had neither orthostatic hypotension nor indolent diarrhea. Restriction enzyme analysis with EcoT22 I of amplified DNA and mass spectrometry analysis revealed homozygosity for ATTR Val30Met. Of 8 family members, 5 were evaluated and found to be heterozygous for ATTR Val30Met; a family history found no relative with the similar neurologic disorders. The sural nerve biopsy specimen showed focal edema and an amyloid deposit in the subperineural tissue, associated with moderate loss of myelinated and unmyelinated fibers. CONCLUSIONS: In addition to the findings characteristic of homozygosity for ATTR Val30Met such as vitreous amyloidosis and relatively less autonomic involvements, this case had the unique findings of motor-dominant sensorimotor polyneuropathy and unusual sural nerve biopsy specimen results.

Amyloid Neuropathies, Familial↗
PubMed2001

Induction of cytotoxic T lymphocytes specific for paraneoplastic cerebellar degeneration-associated antigen in vivo by DNA immunization.

Paraneoplastic cerebellar degeneration associated with gynecological and breast malignancies (PCD) is known to develop autoantibodies and autoreactive cytotoxic T lymphocytes (CTLs) specific for a cytoplasmic protein of Purkinje cells PCD17/cdr2, in the blood of patients. The functional roles of these antibodies and CTLs in the pathogenesis of PCD are unknown. Induction of immune response to this antigen in experimental animals should be useful to clarify the immune mechanisms in PCD patients. We immunized Balb/c mice with naked DNA, which is encoded human PCD17 neural protein in an eukaryotic expression plasmid under control of CMV promoter, and explored whether or not humoral and cell-mediated immune responses against PCD17 could be induced in vivo. We show that DNA immunization with naked pcd17 cDNA could induce autoantibodies against the cytoplasmic protein of Purkinje cells and CTLs could lyse syngenic myeloma cells pulsed with H-2K-restricted PCD17 peptide. In spite of the generation of anti-Purkinje cell antibodies and PCD17-specific CTLs in vivo, neither clinical nor pathological changes consistent with significant cerebellar degeneration have been detected.

Animals↗
PubMed2001

Amyotrophic lateral sclerosis associated with sarcoidosis.

We report a rare association of amyotrophic lateral sclerosis (ALS) with incidental pulmonary and muscle sarcoidosis. A 63-year-old woman presented with slowly progressive weakness and atrophy of the extremities starting from the left leg. The biopsy of a small mass in the left gastrocnemius revealed a typical sarcoid nodule. She was treated with corticosteroid for possible sarcoid neuromyopathy. In spite of the treatment, her clinical course was relentlessly progressive and she died of bulbar palsy. Autopsy revealed a loss of motor neurons in the anterior horn, vacuolar degeneration of the lateral funiculus, and noncaseating granulomas in paratracheal lymph nodes and lungs. No granulomatous lesion or cellular infiltration was found in the spinal cord.

Amyotrophic Lateral Sclerosis↗
PubMed2000

Activation of thrombosis and fibrinolysis following brain infarction.

To clarify the sequence of alterations in the thrombotic and fibrinolytic systems after acute brain infarction, we prospectively examined sequential changes in coagulatory markers in 38 patients suffering from cardioembolic infarcts (CEI), 41 patients with atherothrombotic infarcts (ATI), 58 patients with lacunar infarcts (LI), and 32 age-matched controls. The plasma level of thrombin-antithrombin III complex (TAT), fibrinopeptide A (FpA), D-dimer, fibrin degradation products-E (FDP-E), fibrinogen, alpha2-plasmin inhibitor-plasmin complex (PIC), and percent activity of antithrombin III (AT-III) were measured within 48 h, at 1 week, and at 3 weeks after the stroke onset. Significantly elevated levels of TAT and FpA, which are both markers of thrombin formation, were observed in CEI patients, and these elevated levels were associated with increasing D-dimer levels for 3 weeks (P<0.0001). D-Dimer in CEI patients was significantly elevated compared to control, LI and ATI levels within 48 h (P<0.001). Percent activity of AT-III was significantly decreased in CEI patients for 3 weeks compared to this activity in controls, LI and ATI (P<0.001). TAT and FpA also increased significantly within 48 h in ATI subjects and declined thereafter. A significant elevation of FDP-E (P<0.001) and D-dimer (P<0.05, P<0.01) was detected in parallel with increasing fibrinogen for 3 weeks. However, there was no significant depletion of percent activity of AT-III in ATI. In LI subjects, no significant elevation of TAT, D-dimer or FDP-E were observed within 1 week. PIC increased significantly in three subtypes of brain infarcts, but did not differ significantly among the three subtypes for 3 weeks. An accurate assessment of sequential alterations in thrombotic and fibrinolytic markers in the acute stage of brain infarct should contribute to the clinical diagnosis of brain infarct subtype. Alterations in these markers in response to activation of the coagulatory system are attributable to the different pathogenesis of ischemic stroke.

Aged↗
PubMed2000

Non-N-methyl-D-aspartate glutamate receptors mediate oxygen--glucose deprivation-induced oligodendroglial injury.

Cells of oligodendroglial lineage are susceptible to oxygen and glucose deprivation. When oligodendrocyte-like cells differentiated from CG-4-immortalized rat O-2A progenitor cells were exposed to hypoxia alone or glucose deprivation alone for 48 h, release of lactate dehydrogenase (LDH) into the culture medium did not increase. However, when cells were deprived of both oxygen and glucose for 6 or 12 h preceding reoxygenation for 2 h, LDH release increased. Adding glucose to the medium protected against cell death and increased lactate production in a concentration-dependent manner. Cell damage induced by deprivation of oxygen and glucose was prevented by calcium-free medium or by non-N-methyl-D-aspartate glutamate receptor (GluR) antagonists, such as 6-cyano-7-nitroquinoxaline-2,3-dione or LY293558, but not by the voltage-dependent calcium channel blocker, nimodipine, or by the N-methyl-D-aspartate GluR antagonist, MK-801. The glutamate concentration in the medium from cells exposed to oxygen-glucose deprivation for 12 h was 49.70+/-3.04 microM/l, which is sufficient to activate GluRs during deprivation of oxygen and glucose. Apoptotic cells detected by terminal deoxynucleotidyl transferase (TdT)-mediated dUTP-biotin nick end-labeling (TUNEL) or Hoechst 33258 staining did not increase in cells exposed to oxygen-glucose deprivation for 12 h and subsequent reoxygenation for 2 h. No DNA laddering was detected by agarose gel electrophoresis from cells exposed to deprivation of oxygen and glucose. Neither acetyl-YVAD-CHO, an inhibitor of caspase-1-like proteases, nor acetyl-DEVD-CHO, an inhibitor of caspase-3-like proteases, prevented oxygen-glucose deprivation-induced injury. Thus, oxygen and glucose deprivation causes calcium-influx-induced necrotic cell damage in cells of oligodendroglial lineage via non-N-methyl-D-aspartate GluR channels.

Animals↗
PubMed2000

Cyclic GMP/cyclic GMP-dependent protein kinase system prevents excitotoxicity in an immortalized oligodendroglial cell line.

Previously, we have demonstrated that excitotoxicity of oligodendrocyte-like cells (OLC), differentiated from immortalized rat O-2A progenitor cells (CG-4 cells), is prevented by cyclic AMP-elevating agents. We now report that some agents that elevate cyclic GMP prevent OLC excitotoxicity. Kainate-induced injury was prevented by cyclic GMP analogues (8-bromo-cyclic GMP and dibutyryl cyclic GMP), a guanylate cyclase activator [atrial natriuretic peptide (ANP)], and phosphodiesterase inhibitors [3-isobutyl-1-methylxanthine (IBMX), ibudilast, propentofylline, and rolipram]. When both forskolin and 8-bromo-cyclic GMP were added, kainate-induced injury was additively prevented. There was a strong positive correlation between suppression of kainate-induced Ca2+ influx and prevention of injury by these chemicals. The measurement of intracellular cyclic AMP and cyclic GMP by radioimmunoassay demonstrated the following: an increase of cyclic GMP with treatment with 8-bromo-cyclic GMP, dibutyryl cyclic GMP, and ANP; an increase of cyclic AMP with treatment with ibudilast and rolipram; and an increase of both cyclic AMP and cyclic GMP with treatment with IBMX and propentofylline. Kainate-induced Ca2+ influx was decreased by 8-(4-chlorophenylthiol)-guanosine-3',5'-monophosphate, an activator of cyclic GMP-dependent protein kinase (PKG), or okadaic acid, an inhibitor of protein phosphatases 1 and 2A. RT-PCR and westem blotting of OLC demonstrated transcription of PKG II gene and translation of PKG Ibeta mRNA, but no translation of PKG Ialpha mRNA. Therefore, we concluded that the cyclic GMP/PKG system prevents OLC excitotoxicity.

Animals↗
PubMed2000

[Two cases of thalamic infarction presenting with "thalamic astasia"].

We report two cases of so-called 'thalamic astasia', associated with thalamic infarction. A 76-year-old-man suddenly noted to fall down to the left side without severe hemiparesis. An MRI showed an infarction in the superolateral portion of the right thalamus. Over eight weeks, his astasia gradually disappeared. A 69-year-old-man suddenly noted inability to stand with loss of balance. He showed mild hemiparesis, hypesthesia and cerebellar signs on the right side. Although right hemiparesis was slight, he was unable to stand by himself. An MRI demonstrated an infarction in the ventrolateral to ventroposterior portion of the left thalamus. Three weeks later, his symptoms except for cerebellar ataxia remarkably disappeared. The overlapped MRI lesions of these two cases were localized in the ventrolateral thalamus, such as Vimi (nucleus ventrointermedii internus), Vci (nucleus ventrocaudalis internus), Cemc (nucleus centralis thalami magnocellularis). These lesions are so-called 'vestibular thalamic nuclei', in which fibers from vestibulocerebellum are terminated. Involvement of the thalamic connectivity explains that two patients noted inability to stand. Thus we concluded that these two patients had thalamic astasia, described by Masdeu and Gorelick.

Aged↗