Chlorine dioxide is a more potent antiviral agent against SARS-CoV-2 than sodium hypochlorite.

BACKGROUND: A new coronavirus (SARS-CoV-2) abruptly emerged in Wuhan, China, in 2019 and rapidly spread globally to cause the COVID-19 pandemic. AIM: To examine the anti-SARS-CoV-2 activity of the potent disinfectant Cleverin, the major disinfecting component of which is chlorine dioxide (ClO2); and to compare the results with that of sodium hypochlorite in the presence or absence of 0.5% or 1.0% foetal bovine serum (FBS). METHODS: Concentrated SARS-CoV-2 viruses were treated with various concentrations of ClO2 and sodium hypochlorite and 50% tissue culture infective dose was calcurated to evaluate the antiviral activity of each chemical. FINDINGS: When SARS-CoV-2 viruses were treated with 0.8 ppm ClO2 or sodium hypochlorite, viral titre was decreased only by 1 log10 TCID50/mL in 3 min. However, the viral titre was decreased by more than 4 log10 TCID50/mL when treated with 80 ppm of each chemical for 10 s regardless of presence or absence of FBS. It should be emphasized that treatment with 24 ppm of ClO2 inactivated more than 99.99% SARS-CoV-2 within 10 s or 99.99% SARS-CoV-2 in 1 min in the presence of 0.5% or 1.0% FBS, respectively. By contrast, 24 ppm of sodium hypochlorite inactivated only 99% or 90% SARS-CoV-2 in 3 min under similar conditions. Notably, except for ClO2, the other components of Cleverin such as sodium chlorite, decaglycerol monolaurate, and silicone showed no significant antiviral activity. CONCLUSION: Altogether, the results strongly suggest that although ClO2 and sodium hypochlorite are strong antiviral agents in absence of organic matter but in presence of organic matter, ClO2 is a more potent antiviral agent against SARS-CoV-2 than sodium hypochlorite.

Mitochondrial DNA haplogroups and age at onset of Machado-Joseph disease/spinocerebellar ataxia type 3: a study in patients from multiple populations.

BACKGROUND AND PURPOSE: Mitochondrial dysfunction has been implicated in the pathogenesis of several neurodegenerative disorders, including Machado-Joseph disease (MJD), an autosomal dominant late-onset polyglutamine ataxia that results from an unstable expansion of a CAG tract in the ATXN3 gene. The size of the CAG tract only partially explains age at onset (AO), highlighting the existence of disease modifiers. Mitochondrial DNA (mtDNA) haplogroups have been associated with clinical presentation in other polyglutamine disorders, constituting potential modifiers of MJD phenotype. METHODS: A cross-sectional study, using 235 unrelated patients from Portugal, Brazil, India and Japan, was performed to investigate if mtDNA haplogroups contribute to AO of MJD. mtDNA haplogroups were obtained after sequencing the mtDNA hypervariable region I. Patients were classified in 15 phylogenetically related haplogroup clusters. RESULTS: The AO was significantly different among populations, implying the existence of other non-CAG factors, which seem to be population specific. In the Portuguese population, patients classified as belonging to haplogroup JT presented the earliest onset (estimated onset 34.6 years of age). Haplogroups W and X seem to have a protective effect, causing a delay in onset (estimated onset 47 years of age). No significant association between haplogroup clusters and AO was detected in the other populations or when all patients were pooled. Although haplogroup JT has already been implicated in other neurodegenerative disorders, no previous reports of an association between haplogroups W and X and disease were found. CONCLUSIONS: These findings suggest that haplogroups JT, W and X modify AO in MJD. Replication studies should be performed in European populations, where the frequency of the candidate modifiers is similar.

Effect of low-concentration chlorine dioxide gas against bacteria and viruses on a glass surface in wet environments.

AIMS: To evaluate the efficacy of low-concentration chlorine dioxide (ClO(2)) gas against model microbes in the wet state on a glass surface. METHODS AND RESULTS: We set up a test room (39 m(3)) and the ClO(2) gas was produced by a ClO(2) gas generator that continuously releases a constant low-concentration ClO(2) gas. Influenza A virus (Flu-A), feline calicivirus (FCV), Staphylococcus aureus and Escherichia coli were chosen as the model microbes. The low-concentration ClO(2) gas (mean 0.05 ppmv, 0.14 mg m(-3)) inactivated Flu-A and E. coli (>5 log(10) reductions) and FCV and S. aureus (>2 log(10) reductions) in the wet state on glass dishes within 5 h. CONCLUSIONS: The treatment of wet environments in the presence of human activity such as kitchens and bathrooms with the low-concentration ClO(2) gas would be useful for reducing the risk of infection by bacteria and viruses residing on the environmental hard surfaces without adverse effects. SIGNIFICANCE AND IMPACT OF THE STUDY: This study demonstrates that the low-concentration ClO(2) gas (mean 0.05 ppmv) inactivates various kinds of microbes such as Gram-positive and Gram-negative bacteria, enveloped and nonenveloped viruses in the wet state.

Identification and haplotype analysis of LRRK2 G2019S in Japanese patients with Parkinson disease.

LRRK2 G2019S is the most common known cause of Parkinson disease (PD) in patients of European origin, but little is known about its distribution in other populations. The authors identified two of 586 Japanese patients with PD heterozygous for the mutation who shared a haplotype distinct from that observed in Europeans. This suggests that G2019S originated from separate founders in Europe and Japan and is more widely dispersed than previously recognized.

Touch imprint cytology and immunohistochemistry for the assessment of sentinel lymph nodes in patients with breast cancer.

AIMS: Accurate evaluation of sentinel nodes is of clinical importance to avoid further surgery for axillary node dissection. A prospective study was carried out to investigate the feasibility and accuracy of touch imprint cytology (TIC) and touch imprint immunohistochemistry (TIHC). METHODS: Two hundred and five sentinel nodes from consecutive 118 patients with primary breast cancer were studied after successful identification of sentinel nodes. Sentinel nodes were sectioned at 2 mm intervals and imprint specimens prepared from all cut surfaces were subjected to Papanicolaou staining and immunohistochemical staining using anti-cytokeratin antibody. RESULTS: Forty-nine sentinel nodes from 40 patients were positive by permanent section. The sensitivity of TIC was 84% (41/49) per sentinel node and 83% (33/40) on a per patient basis. The sensitivity of TIHC was 86% (42/49) per sentinel node and 83% (33/40) on a per patient basis. When the results of TIC and TIHC were combined, the sensitivity was 88% (43/49) per sentinel node and 85% (34/40) on a per patient basis. Among the 156 negative sentinel nodes, four sentinel nodes from four different patients were consistently positive by TIC and TIHC, but only one patient out of 78 node-negative patients was upstaged. CONCLUSIONS: Touch imprint cytology is sufficiently sensitive for intraoperative evaluation of sentinel nodes. A slight improvement in the sensitivity is expected when immunohistochemistry is used. The combination of these methods provides better sensitivity than either method alone.

Lack of an association between cystatin C gene polymorphisms in Japanese patients with Alzheimer's disease.

Associations between polymorphisms of the cystatin C gene (CST3) at 5' flanking region and exon 1 in Caucasian patients with late onset AD and exon 1 in a US study of late onset AD have been reported. Clinically diagnosed Japanese patients with AD and Japanese normal control subjects were assessed for the presence of polymorphisms of CST3. The authors could not confirm the previously reported association between CST3 polymorphisms and AD in Japan. Age had no effect on the CST3 genotype.

Genetic studies in Parkinson's disease with an alpha-synuclein/NACP gene polymorphism in Japan.

Dinucleotide repeat polymorphism has been observed in the promoter of the alpha-synuclein (alpha-SYN)/NAC precursor protein (NACP) gene. Alpha-SYN/NACP allele 3 (described by Xia et al. (Ann. Neurol., 40 (1996) 207), equivalent to allele 1 described by Krüger et al. (Ann. Neurol. 45 (1999) 611) is reported to be significantly more frequent among patients with sporadic Parkinson's disease (sPD) than controls. In this study, we genotyped the same alpha-SYN/NACP polymorphism in Japanese sPD patients and healthy controls, but found that any aliele showed no significant difference between the two groups.

Elongation of repetitive DNA by DNA polymerase from a hyperthermophilic bacterium Thermus thermophilus.

Short repetitive DNA sequences are believed to be one of the primordial genetic elements that served as a source of complex large DNA found in the genome of modern organisms. However, the mechanism of its expansion (increase in repeat number) during the course of evolution is unclear. We demonstrate that the DNA polymerase of the hyperthermophilic bacterium Thermus thermophilus can elongate oligoDNA with several tandem repeats to very long DNA in vitro. For instance, 48mer repetitive oligoDNA (TACATGTA)(6), which has 25% GC content and a palindromic sequence, can be elongated up to approximately 10 000 bases by DNA polymerase at 74 degrees C without template DNA. OligoDNA having a different GC content or a quasi-palindromic sequence can also be elongated, but less efficiently. A spectroscopic thermal melting experiment with the oligoDNA showed that its hairpin-coil transition temperature was very close to the elongation reaction temperature (74 degrees C), but was much higher than the temperature at which duplex oligoDNA can exist stably. Taken together, we conclude that repetitive oligoDNA with a palindromic or quasi-palindromic sequence is elongated extensively by a hyperthermophilic DNA polymerase through hairpin-coil transitions. We propose that such an elongation mechanism might have been a driving force to expand primordial short DNA.

Evaluation of the interobserver agreement in the number of mitotic figures of breast carcinoma as simulation of quality monitoring in the Japan National Surgical Adjuvant Study of Breast Cancer (NSAS-BC) protocol.

In the National Surgical Adjuvant Study for Breast Cancer (NSAS-BC), node-negative breast cancers were divided into higher- and lower-risk groups according to the histopathological nuclear grade given at individual collaborating hospitals, and the higher-risk group was entered into a randomized protocol of adjuvant therapy. Because the nuclear grade was the composite of nuclear atypia and mitotic counts, maintenance of interobserver agreement in mitotic counts was indispensable for the success of the protocol study. Fourteen pathologists participating in the protocol judged whether or not 20 photomicrographs suspected of showing mitotic cancer-cell figures truly showed mitoses. After standardizing the counting method, these pathologists counted the number of mitotic figures per 10 high-power fields of hematoxylin-eosin-stained main-tissue sections of 20 tumors. Areas where mitotic counts were considered to be the most frequent by each pathologist were compared for these tumors. For the judgment of whether the photomicrograph indicated mitosis, the level of interobserver agreement was moderate (kappa = 0.569). In the observations of 20 tumors, interobserver agreement level of mitotic counts was moderate (kappa = 0.506), that of nuclear atypia scoring was fair (kappa = 0.265), and that of nuclear grading was substantial (kappa = 0.633). The counted area was almost the same among the observers in 9 tumors, split into two areas in 6, and dispersed in 5. Concordance in judgment was achieved in 7 of the first 9 and in all of the third 5, but only in one of the second 6. The cause of discordance was mostly derived from tumor heterogeneity and the difference in the site where mitoses were counted. Interobserver agreement level was considered to be satisfactory, and it was expected that the case entry would be performed appropriately in the protocol study. The selection of the counting area was confirmed to be important for the acquisition of high-level agreement level in mitotic counts.

A single nucleotide polymorphism of dopamine transporter gene is associated with Parkinson's disease.

We identified two polymorphisms out of all coding regions of the dopamine transporter gene. One existed in exon 9 (1215A/G) and another in exon 15 (1898T/C). The 1215G was significantly less frequent among patients with Parkinson's disease than the controls. Although the polymorphism caused no amino acid substitution, we concluded that it was associated with decreasing the susceptibility to Parkinson's disease through mechanisms other than the protein function of dopamine transporter.

[An elderly case of chronic inflammatory demyelinating polyneuropathy with acute onset in the course of diabetes mellitus].

A 77-year-old man was admitted because of muscle weakness in both upper and lower extremities. Diabetes mellitus was diagnosed in 1988 and he had been treated by oral hypoglycemic agents. He had a common cold at the end of January, 1997. Muscle weakness appeared in the upper extremities, followed by the lower extremities at the end of February. No sensory disturbance or dysuria was recognized. Nerve conduction study revealed distally dominant demyelinating polyneuropathy. Guillain-Barré's syndrome was diagnosed and he recovered completely following immunological absorption therapy (IAT). However, he had quadriplegia again at the end of April. He was treated by IAT combined with corticosteroid and has shown no relapse. In June, 1997, gastric cancer was detected by upper gastrointestinal fiberscopy and subtotal gastrectomy was performed. Judging from this clinical course, this case seems to be chronic inflammatory demyelinating polyneuropathy (CIDP) with acute onset. Many kinds of causes often contribute to the pathogenesis of neuropathy in the elderly. So in cases of progression or worsening, we should consider such possibilities and it is necessary not to exclude treatable causes of neuropathy.

Effect of wood creosote and loperamide on propulsive motility of mouse colon and small intestine.

To elucidate a mechanism of the antidiarrheal activity of wood creosote, its effect on the propulsive motility of mouse colon and small intestine was studied using a charcoal meal test and a colonic bead expulsion test. The effect was compared with that of loperamide. At an ordinary therapeutic dose, wood creosote inhibited the propulsive motility of colon, but not of small intestine. On the other hand, loperamide inhibited the propulsive motility of small intestine, but not of colon. The results indicate that at least a part of the antidiarrheal activity of wood creosote and loperamide is attributable to their antikinetic effect predominantly on colon of the former and predominantly on small intestine of the latter.

[An autopsy case of Degos' disease with ascending thoracic myelopathy].

Degos' disease is a rare multisystem vasculopathy of unknown etiology. We report a 44-year-old man who presented himself with gait and sensory disturbances mainly due to thoracic transverse myelopathy four years after the appearance of many characteristic umbilicated papules over the trunk and extremities. He did not complain of abdominal pain or discomfort. Laboratory, electrophysiological and imaging studies did not show any characteristic change, except for the increase of protein contents and cell counts in the cerebrospinal fluid. We tried methylprednisolone pulse-dose therapy (1,000 mg/day x 3 days) five times, but this patient's neurological condition worsened stepwise after it, although the appearance of new skin lesion was suppressed. Intravenous infusion of ozagrel sodium and cyclophosphamide (1,000 mg/day) were also ineffective, and this patient died of respiratory failure after showing oculomotor paresis and comatose state. Necropsy revealed Degos' disease-specific vasculopathy in the central nervous system and the gastrointestinal tract, where occlusions of small-sized arteries and veins due to the intimal thickening were evident. The tissue necrosis was macroscopically remarkable in the brainstem and the thoracic spinal cord. The efficacy of steroid therapy for this disease should be investigated more carefully.

Mucocele-like Tumor of the Breast: A Case Report and Assessment of Aspirated Cytological Specimens.

BACKGROUND: Mucocele-like tumor(MLT)is a rare benign condition, and ofter misdiagnosed as mucinous carcinoma. METHODS: We encountered a 31-year-old woman with MLT of the breast. The patient presented with an elastic hard mass, 0.5cm in diameter, located in the upper outer quadrant of the right breast. RESULTS: Physical examination as well as ultrasonography and mammography indicated a benign lesion. However, mucinous carcinoma was suspected based on aspiration biopsy cytology. MLT was finally diagnosed on excisional biopsy. CONCLUSION: Awareness of this breast disease helps to prevent misdiagnosis and unnecessary surgery.

Pro-gastrin-releasing peptide (31-98) as a tumour marker of small-cell lung cancer: comparative evaluation with neuron-specific enolase.

We attempted to clarify whether serum levels of a carboxy-terminal fragment of ProGRP, ProGRP(31-98), could serve as a more accurate tumour marker in patients with SCLC than neuron-specific enolase (NSE). ProGRP(31-98) and NSE were measured retrospectively in 101 newly diagnosed untreated patients with SCLC, 111 with non-small-cell lung cancer (NSCLC) and 114 patients with non-malignant lung diseases. ProGRP(31-98) and NSE levels were determined using a sandwich enzyme-linked immunosorbent assay. Sensitivity in SCLC patients was 72.3% for ProGRP(31-98) and 62.4% for NSE. Comparing the area under curve (AUC) of 'receiver operator characteristics' of ProGRP(31-98) with that of NSE, ProGRP(31-98) was the more powerful marker in the diagnosis of SCLC (P = 0.0001). Serum levels of ProGRP(31-98) were higher in the 40 patients with extensive disease than in the 61 patients with limited disease (P = 0.0082). ProGRP(31-98) was significantly higher in patients with pure small-cell carcinoma than in patients with mixed small-cell/large-cell carcinoma (P = 0.02). In serial measurement in 16 patients responding to treatment, a high degree of correlation was noted between the decrease in serum ProGRP(31-98) levels and clinical response during the second week after treatment (P = 0.0045). These results indicate that the determination of serum ProGRP(31-98) levels plays an important role in the diagnosis and treatment of SCLC patients.

Histologic changes in small cell lung carcinoma after treatment.

BACKGROUND: Small cell lung carcinoma (SCLC) has been divided into three subtypes: pure SCLC, mixed small cell/large cell carcinoma (mixed SC/LC), and combined SCLC. Patients with mixed SC/LC show a worse prognosis than those with pure SCLC. METHODS: Persistence of histologic subtype in SCLC in the primary sites during the course of treatment or in the different organs at autopsy was examined. For this purpose, biopsy or cytologic specimens before chemotherapy, and autopsy specimens from 175 patients with SCLC were reviewed. They included 147 (84%) men and 28 (16%) women with an age range of 29-83 (median, 65) years. RESULTS: The frequency of mixed SC/LC in the primary sites was statistically higher in autopsy (14.3%) than that in biopsy or cytology specimens (8.6%) (P < 0.05). At autopsy, involved organs were categorized into two groups according to frequency of appearance of mixed SC/LC, i.e., a higher frequency group, including the liver (31 of 85; 36.4%), adrenal gland (15 of 56; 26.8%), brain (6 of 9; 66.7%), and extrathoracic lymph nodes (17 of 59; 28.8%) and a lower frequency group, including the lung (metastatic sites) (12 of 102; 11.8%), pleura (8 of 74; 10.8%), and intrathoracic lymph nodes (12 of 94; 12.8%). The difference in frequency between these two groups was statistically significant (P < 0.05). CONCLUSIONS: These findings suggest that primary pure SCLC can progress to mixed SC/LC with an increased potential for distant metastasis.

Expression patterns of acidic and basic fibroblast growth factor in loach fish embryos.

Heparin-binding fractions were taken from the heparin sepharose columns on which extracts of loach fish (Misgurnus anguillicaudatus) embryos from blastula, gastrula, 4-8 and 12-16 somites stages were applied. These heparin-binding fractions, except the fraction derived from 12-16 somite embryos, showed potent mitogenic activity on fibroblast-like cells derived from caudal fin blastema of goldfish. Western blot analysis of these heparin-binding fractions was carried out using monoclonal antibodies against human acidic and basic fibroblast growth factors (FGF-1 and-2). An immunoreactive FGF-1 band at 16 kD was detected in the heparin-binding fraction derived from embryos in each stage of blastula, gastrula and 4-8 somites. An immunoreactive FGF-2 band at 17 kDa was detected exclusively in the heparin-binding fraction derived from 4-8 somite embryos. In the heparin-binding fraction derived from 12-16 somite embryos neither immunoreactive FGF-1 nor-2 member band was detectable.

The binding of ricin to its receptor is not required for the expression of its toxicity.

Ricin toxin is a toxic glycoprotein comprising two polypeptide chains, A and B, joined by a disulfide bond. The binding of its B-chain to the cell surface glycoconjugate having non-reducing terminal galactose (ricin receptors) has been assumed to allow the internalization of ricin into the cell, followed by the release of the free A-chain into cytosol, which then inhibits cellular protein synthesis in eukaryotic cells (cytotoxic effect). In order to investigate whether the binding of ricin to its receptors is essential to the expression of its toxicity, ricin was allowed to be incorporated into the cells using liposome encapsulated ricin (ricin-encapsulated liposomes). Protein synthesis in cultured Hela cells was inhibited by incubation not only with intact ricin but also with ricin-encapsulated liposomes, indicating that the binding of ricin to its receptor is not required for the expression of its toxicity.