Multi-Locus Sequence Typing and Lipooligosaccharide Class Analysis of Campylobacter jejuni HS:19 Isolated in Japan.

Campylobacter jejuni is a major foodborne pathogen that causes enteritis in humans, and is also known to be an antecedent infectious factor for Guillain-Barré syndrome (GBS). The onset of GBS after C. jejuni infection results from molecular mimicry between human neuronal gangliosides and C. jejuni lipooligosaccharides (LOS). C. jejuni HS:19 has been previously isolated from GBS cases more frequently than other serotypes in Japan. Therefore, in this study, we performed molecular analysis of 88 HS:19 isolates from GBS cases, sporadic diarrhea patients, and poultry meat samples, using multi-locus sequence typing and LOS class analysis. As a result, 87 of the 88 HS:19 isolates were typed as ST22 / CC22 and LOS class A1, while one was typed as ST1947 / CC22 and LOS class A1. Furthermore, the analysis of another 331 isolates from sporadic enteritis cases showed that only 34 (10.3%) were classified as LOS class A, including HS:19 (25 isolates), HS:2 (8 isolates), and HS:4c (1 isolate). In conclusion, C. jejuni HS:19 had high clonality, regardless of its origin, compared to other capsule types in Japan.

Osmotic Demyelination Syndrome due to Rhabdomyolysis and Hyperosmolar Hyperglycemic Syndrome following Cardiogenic Shock.

Osmotic demyelination syndrome (ODS) is a relatively rare disease that causes rapid demyelination, resulting in pontine and central nervous system damage with various symptoms, including impaired consciousness. It often occurs when hyponatremia is rapidly corrected. However, it can also occur when a normonatremic patient suddenly develops hypernatremia. A 51-year-old man developed cardiogenic shock with impaired consciousness, hyperCKemia, hypernatremia, and hyperglycemia. Osmotic demyelination syndrome secondary to rhabdomyolysis and hyperosmolar hyperglycemic syndrome was suspected. The patient's fluid volume decreased because of osmotic diuresis caused by hyperglycemia, and the blood sodium level increased rapidly. The latter resulted in ODS, which in turn resulted in a prolonged disturbance of consciousness, from which he has not yet recovered. ODS has been reported as a serious complication of rapid correction of hyponatremia, although it also occurs when normonatremia leads to hypernatremia. This disease is difficult to diagnose, as magnetic resonance imaging (MRI) of the brain is often unremarkable several weeks after its onset. This case of ODS occurred when normonatremia led to hypernatremia, as a result of rhabdomyolysis and hyperosmolar hyperglycemic syndrome. Diagnosis was made based on the MRI brain findings.

A case of otitis externa caused by Schizophyllum commune: An approach to antimicrobial stewardship using Gram staining of otorrhea in a medical clinic.

Recently, basidiomycete Schizophyllum commune has been reported as a cause of allergic bronchopulmonary mycosis. However, it is rare as a cause of otitis externa. We experienced a very rare case of otitis externa caused by S. commune in a 68-year-old man with a history of chronic otitis media. We performed Gram staining at the first consultation and follow-up treatment and found fungal cells on the smear and treated him with an appropriate antifungal drug. The results of identification and antifungal susceptibility testing obtained in cooperation with clinical microbiologists at other facilities was very important for future treatment planning decisions. Medical practitioners worldwide should introduce a Gram staining tool into their workflow and cooperate closely with clinical microbiologists to achieve antimicrobial stewardship.

Comparison between patients with norovirus-related gastroenteritis and asymptomatic carriers with respect to distribution of antibody-complexed viral particles and intestinal flora.

Asymptomatic carriers have a major influence on the spreading of norovirus infections. The objective of this study was to examine the characteristics of patients and asymptomatic carriers affected by norovirus-related community gastroenteritis outbreaks. No significant difference between the two groups was observed in terms of the number of norovirus-antibody complexes with respect to total numbers. Principal coordinates analysis of the intestinal flora based on ß-diversity analysis, revealed a different bacterial composition between patients and asymptomatic carriers, particularly regarding the genera Pseudomonas, Bacteroides, and Erwinia, as well as the Ruminococcaceae family. Although the proportional changes between these intestinal microorganisms were not sufficient to explain gastroenteritis symptoms, they represent possible markers shared by asymptomatic norovirus carriers.

Continuous intake of the Chaga mushroom (Inonotus obliquus) aqueous extract suppresses cancer progression and maintains body temperature in mice.

AIMS: Cancer is a leading cause of morbidity and mortality worldwide; therefore, effective measures for cancer prevention and treatment are in constant demand. The extracts of Inonotus obliquus (Chaga mushroom) demonstrate potent anti-tumor activities and have been used to treat cancer in several countries; however, the actual effect and underlying mechanisms are still unclear. In the present study, we aimed to investigate the effects of continuous intake of aqueous extract from I. obliquus on tumor suppression. MAIN METHODS: Anticancer activity of the I. obliquus extract was examined in mouse models of Lewis lung carcinoma growth and spontaneous metastasis after 3 weeks of continuous extract intake at the dose of 6 mg/kg/day, which corresponded to that ingested daily with Chaga infusion in Japan. KEY FINDINGS: The extract of I. obliquus caused significant tumor suppressive effects in both models. Thus, in tumor-bearing mice, 60% tumor reduction was observed, while in metastatic mice, the number of nodules decreased by 25% compared to the control group. Moreover, I. obliquus extract-treated mice demonstrated the increase in tumor agglomeration and inhibition of vascularization. Interestingly, I. obliquus intake decreased body weight in middle-aged mice and increased body temperature in response to light-dark switching in mature adult mice. Furthermore, I. obliquus prevented temperature drop in mice after tumor implantation. SIGNIFICANCE: Our findings suggest that the I. obliquus extract could be used as a natural remedy for cancer suppression by promoting energy metabolism.

JCGGDB: Japan Consortium for Glycobiology and Glycotechnology Database.

The biological significance of glycans has been widely studied and reported in the past. However, most achievements of our predecessors are not readily available in existing databases. JCGGDB is a meta-database involving 15 original databases in AIST and 5 cooperative databases in alliance with JCGG: Japan Consortium for Glycobiology and Glycotechnology. It centers on a glycan structure database and accumulates information such as glycan preferences of lectins, glycosylation sites in proteins, and genes related to glycan syntheses from glycoscience and related fields. This chapter illustrates how to use three major search interfaces (Keyword Search, Structure Search, and GlycoChem Explorer) available in JCGGDB to search across multiple databases.

Characteristics of caffeine intoxication-related death in Tokyo, Japan, between 2008 and 2013.

OBJECTIVES: Caffeine is widely available in beverages and over-the-counter products; however, in large doses, it can lead to lethal arrhythmia. This study aims to clarify the characteristics of caffeine intoxication-related deaths in Tokyo, Japan. SUBJECTS: Among the 4754 forensic autopsy cases between 2008 and 2013 in which a toxicological investigation was performed, cases in which the blood concentration of caffeine exceeded toxic levels (15 µg/ml) were selected (N = 22). We examined subjects' ages, medical histories, direct/underlying causes of death, and manner of death. We also assessed concurrent drug substance detection and identified the origin of the caffeine. RESULTS: More than 60% of the subjects were between the ages of 20 and 49 years (n = 14, 63.6%). Sixteen cases (72.7%) showed a history of psychiatric diseases such as depression and sleep disorders. The underlying cause of death for all cases except two was caffeine intoxication, and manner of death was classified as undetermined (n = 11), accidental (n = 7), suicide (n = 2), or others (n = 2). Toxicological analysis revealed the presence of ingredients common to analgesics/cold remedies in 12 cases (54.5%). The origin of the caffeine was identified in 11 cases (50.0%); the proportion of identification was significantly lower among the cases in which analgesic/cold remedy ingredients were not detected (20.0%). CONCLUSIONS: Caffeine intoxication-related deaths mainly occurred in young and middle-aged persons with common psychiatric diseases. Psychiatrists should take note of caffeine dependence while diagnosing common psychiatric symptoms. In half of the cases, the origin of the caffeine was unidentified; nevertheless, dietary sources or over-the-counter drugs containing caffeine were suspected. As it becomes easier to obtain caffeinated products, continuous monitoring of the number of deaths from caffeine intoxication, in addition to detailed investigations of the caffeine's origin, will be necessary.

Neural Mechanisms That Underlie Angina-Induced Referred Pain in the Trigeminal Nerve Territory: A c-Fos Study in Rats.

The present study was designed to determine whether the trigeminal sensory nuclear complex (TSNC) is involved in angina-induced referred pain in the trigeminal nerve territory and to identify the peripheral nerve conducting nociceptive signals that are input into the TSNC. Following application of the pain producing substance (PPS) infusion, the number of Fos-labeled cells increased significantly in the subnucleus caudalis (Sp5C) compared with other nuclei in the TSNC. The Fos-labeled cells in the Sp5C disappeared when the left and right cervical vagus nerves were sectioned. Lesion of the C1-C2 spinal segments did not reduce the number of Fos-labeled cells. These results suggest that the nociceptive signals that conduct vagal afferent fibers from the cardiac region are input into the Sp5C and then projected to the thalamus.

Two new Japanese species of Gastrotricha (Chaetonotida, Chaetonotidae, Lepidodermella and Dichaeturidae, Dichaetura), with Comments on the Diversity of Gastrotrichs in Rice Paddies.

Two new species of freshwater gastrotrichs are described from rice paddies in Otsu, Shiga, Japan. Lepidodermella acantholepida n. sp. is a medium sized species attaining a length of 145 microum, scales are flattened ovals and similar to those of L. squamata except that two dorsal scales near the furca have a claw-like spine. Dichaeturafilispina n. sp. is a medium sized species attaining a length of 185 microm, characterized by a thin, fiber-like spine, a spined furca with a constriction near its base and an elongate body. A total of 44 species (seven genera) including two new species were found in the rice paddies. The diversity of rice paddy gastrotrichs is briefly discussed.

Biological implications of coeruleospinal inhibition of nociceptive processing in the spinal cord.

The coeruleospinal inhibitory pathway (CSIP), the descending pathway from the nucleus locus coeruleus (LC) and the nucleus subcoeruleus (SC), is one of the centrifugal pain control systems. This review answers two questions regarding the role coeruleospinal inhibition plays in the mammalian brain. First is related to an abnormal pain state, such as inflammation. Peripheral inflammation activated the CSIP, and activation of this pathway resulted in a decrease in the extent of the development of inflammatory hyperalgesia. During inflammation, the responses of the dorsal horn neurons to graded heat stimuli in the LC/SC-lesioned rats did not produce a further increase with the increase of stimulus intensity in the higher range temperatures. These results suggest that the function of CSIP is to maintain the accuracy of intensity coding in the dorsal horn because the plateauing of the heat-evoked response in the LC/SC-lesioned rats during inflammation is due to a response saturation that results from the lack of coeruleospinal inhibition. The second concerns attention and vigilance. During freezing behavior induced by air-puff stimulation, nociceptive signals were inhibited by the CSIP. The result implies that the CSIP suppresses pain system to extract other sensory information that is essential for circumstantial judgment.

A possible synaptic configuration underlying coeruleospinal inhibition of visceral nociceptive transmission in the rat.

A synaptic arrangement underlying descending inhibition from the locus coeruleus/subcoeruleus (LC/SC) on visceral nociceptive transmission in the spinal cord was investigated in the anesthetized rat. Extracellular recordings were made from the L(6)-S(2) segmental level using a carbon filament glass microelectrode (4-6 MΩ). Colorectal distention (CRD) was produced by inflating a balloon inside the descending colon and rectum. All neurons tested responded to both CRD and to cutaneous pinch (a force of 613 g/mm(2)), indicating that nociceptive signals from visceral organs and nociceptive signals from the cutaneous receptive field converge on a single neuron. These neurons were divided into two groups based on their response to CRD: short latency-abrupt and short latency-sustained neurons. Electrical stimulation of the LC/SC (30 or 50 µA, 100 Hz, 0.1 ms pulses) inhibited both CRD-evoked and cutaneous pinch-evoked responses in short latency-abrupt and short latency-sustained neurons. When graded CRD (20, 40, 60, and 80 mmHg) was delivered, LC/SC stimulation produced a reduction in slope of the linear CRD intensity-response magnitude curve without a change in the response threshold in both short latency-abrupt (n = 42) and short latency-sustained neurons (n = 11). This result suggests that coeruleospinal inhibition of visceral nociceptive transmission is due to a synaptic configuration in which inhibitory and excitatory terminals are in close spatial proximity, including presynaptic inhibition.

New fluorimetric assay of horseradish peroxidase using sesamol as substrate and its application to EIA.

Horseradish peroxidase (HRP) is generally used as a label enzyme in enzyme immunoassay (EIA). The procedure used for HRP detection in EIA is critical for sensitivity and precision. This paper describes a novel fluorimetric assay for horseradish peroxidase (HRP) using sesamol as substrate. The principle of the assay is as follow: sesamol (3,4-methylenedioxy phenol) is reacted enzymatically in the presence of hydrogen peroxide to produce dimeric sesamol. The dimer is fluorescent and can be detected sensitively at ex. 347 nm, em. 427 nm. The measurable range of HRP was 1.0×10-18 to 1.0×10-15 mol/assay, with a detection limit of 1.0×10-18 mol/assay. The coefficient of variation (CV, n=8) was examined at each point on the standard curve, with a mean CV percentage of 3.8%. This assay system was applied to thyroid stimulating hormone (TSH) EIA using HRP as the label enzyme.

The nucleus locus coeruleus/subcoeruleus contributes to antinociception during freezing behavior following the air-puff startle in rats.

An air puff elicits a startle response in mammals. Following the startle response, rats react with a defensive-like, immobile posture (DIP) of approximately 2-5s in length. We have previously reported that air-puff stimulation (APS) activates the nucleus locus coeruleus/subcoeruleus (LC/SC) so that the DIP is induced. The LC/SC is one of the structures that plays an important role in endogenous pain control. Our particular interest is whether APS induces nociceptive modulation. Rats were tested for behavioral nociception with heating of the tail. Rats whisked their tail following heating and then bit the heat source when the tail could not escape heating by tail flick. The tail flick latency (TFL) and the bite latency (BL) were measured as an indicator of nociception. Compressed house air (14.4 psi in strength, 0.1s in duration) was presented for APS. Two weeks before the experiment, the rats received bilateral injections of 6 µg of the neurotoxin 6-hydroxydopamine to specifically lesion noradrenaline-containing neurons of the LC/SC. APS produced prolongation of the TFL and the BL. In both the TFL and the BL, APS-induced prolongation was not observed in rats with the LC/SC lesions. When BLs were plotted against DIP periods, the BL was almost constant regardless of the change in the DIP period. These results suggest that (1) APS produces nociceptive modulation, (2) the LC/SC is involved in APS-induced nociceptive modulation, and (3) two APS-induced events, the DIP and nociceptive modulation, are a parallel phenomenon.

Development of a novel fluorometric assay for nitric oxide utilizing sesamol and its application to analysis of nitric oxide-releasing drugs.

Nitric oxide (NO) is related to various physiological effects as well as to numerous diseases caused by accentuation of NO production. Measurement of NO in cells and tissues is difficult as NO readily reacts with other molecules; furthermore, its half-life as a radical is fleeting. Currently, many NO pharmaceuticals are marketed as therapeutic agents for ischemic disease. Consequently, the identification of NO radicals and determination of generation rate from pharmaceuticals is very important when the effect of the medicinal supply is estimated. In this study, we developed a fluorometric assay for NO employing sesamol (3,4-methylenedioxyphenol) as a fluorometric substrate. Sesamol is converted to a fluorescent derivative (ex. 365 nm, em. 447 nm), which is dimmer in the presence of NO. The detection limit of NO with this method is 400 fmol; moreover, NO generated from drugs can be measured.

Chemical synthesis of bile acid acyl-adenylates and formation by a rat liver microsomal fraction.

In mammals, unconjugated bile acids formed in the intestine by bacterial deconjugation are reconjugated (N-acylamidated) with taurine or glycine during hepatocyte transport. Activation of the carboxyl group of bile acids to form acyl-adenylates is a likely key intermediate step in bile acid N-acylamidation. To gain more insight into the process of bile acid adenylate formation, we first synthesized the adenylates of five common, natural bile acids (cholic, deoxycholic, chenodeoxycholic, ursodeoxycholic, and lithocholic acid), and confirmed their structure by proton NMR. We then investigated adenylate formation by subcellular fractions of rat liver (microsomes, mitochondria, cytosol) using a newly developed LC method for quantifying adenylate formation. The highest activity was observed in the microsomal fraction. The reaction required Mg(2+) and its optimum pH was about pH 7.0. In term of maximum velocity (V(max)) and the Michaelis constant (K(m)), the catalytic efficiency of the enzyme under the conditions used was highest with cholic acid of the bile acids tested. The formation of cholyl-adenylate was strongly inhibited by lithocholic and deoxycholic acid, as well as by palmitic acid; ibuprofen and valproic acid were weak inhibitors. In cholestatic disease, such adenylate formation might lead to subsequent bile acid conjugation with glutathione or proteins.

Descending pathways from activated locus coeruleus/subcoeruleus following unilateral hindpaw inflammation in the rat.

We have previously shown that the descending pathways from the locus coeruleus (LC)/subcoeruleus (SC) to the spinal cord are activated during peripheral inflammation, and that activation of this coeruleospinal system decreases development of hyperalgesia. Anatomical evidence suggests that the descending modulation system from the LC/SC should be active bilaterally during inflammation when the LC/SC either ipsilateral or contralateral to the site of inflammation is activated. In the present study, the development of hyperalgesia following the induction of unilateral hindpaw inflammation was compared between rats with either bilateral or unilateral lesions of the LC/SC and rats with a sham operation. Four hours after carrageenan injection, in the inflamed paw, paw withdrawal latencies (PWLs) to thermal stimuli of the bilateral LC/SC-lesioned rats were significantly shorter than those of the unilateral LC/SC-lesioned and the sham-operated rats, whereas the decreased PWLs of the unilateral LC/SC-lesioned rats were equivalent to those of the sham-operated rats. A difference in PWL between the bilateral and the unilateral LC/SC-lesioned rats was not observed in the contralateral non-inflamed paw. The result suggests that in the LC/SC both ipsilateral and contralateral to the inflamed paw, only neurons which project to the dorsal horn ipsilateral to the inflamed paw were activated following peripheral inflammation.

Production and characterization of a monoclonal antibody to capture proteins tagged with lithocholic acid.

Reactive metabolic-modified proteins have been proposed to play an important role in the mechanism(s) of the hepatotoxicity and colon cancer of lithocholic acid (LCA). To identify cellular proteins chemically modified with LCA, we have generated a monoclonal antibody that recognizes the 3alpha-hydroxy-5beta-steroid moiety of LCA. The spleen cells from a BALB/c mouse, which was immunized with an immunogen in which the side chain of LCA was coupled to bovine serum albumin (BSA) via a succinic acid spacer, was fused with SP2/0 myeloma cells to generate antibody-secreting hybridoma clones. The resulting monoclonal antibody (gamma2b, kappa) was specific to LCA-N(alpha)-BOC-lysine as well as the amidated and nonamidated forms of LCA. The immunoblot enabled the detection of LCA residues anchored on BSA and lysozyme. The antibody will be useful for monitoring the generation, localization, and capture of proteins tagged with LCA, which may be the cause of LCA-induced toxicity.

Descending modulation of visceral nociceptive transmission from the locus coeruleus/subcoeruleus in the rat.

The purpose of the present investigation was to examine whether electrical stimulation in the locus coeruleus/subcoeruleus (LC/SC) could modulate visceral pain evoked by noxious colorectal distention (CRD). Experiments were performed on 40 pentobarbital anesthetized male Sprague-Dawley rats. Extracellular potentials of single L(6)-S(2) spinal neuron were recorded with a carbon filament electrode. CRD (80 mmHg) was produced by inflating a balloon inside the descending colon and rectum. Electrical stimulation of the LC/SC (30, 50 and 70 microA, 100 Hz, 0.1 ms pulses) was delivered either ipsilaterally or contralaterally. Results showed that for 42/62 (68%) short-latency abrupt (SL-A) neurons, all of the short-latency sustained (SL-S) and long-latency (LL) neurons, LC/SC stimulation produced intensity-dependent attenuation of the CRD-evoked discharge. For 10/62 (16%) SL-A neurons, 6/8 (75%) inhibited (INHIB) neurons LC/SC stimulation increased the evoked discharge, for 10/62 (16%) SL-A neurons and 2/8 (25%) INHIB neurons, the evoked discharges were unaffected by the LC/SC stimulation. LC/SC stimulation also had different effects on the spontaneous activities of these neurons. The effects of LC/SC stimulation were the same both ipsilaterally and contralaterally either for the evoked discharges or for spontaneous activities. Following LC/SC lesions, LC/SC stimulation did not inhibit nociceptive responses, whereas inhibitory effects were observed by stimulation of the intact LC/SC contralateral to the recording site. These data suggest that the transmission of visceral pain was under the control of the centrifugal pathways from the LC/SC.

Immunoprecipitation and MALDI-MS identification of lithocholic acid-tagged proteins in liver of bile duct-ligated rats.

Formation of covalently bound protein adducts with lithocholic acid (LCA) might explain LCA's known carcinogenic properties and hepatotoxicity. We performed studies aimed at isolating and identifying hepatic proteins tagged with LCA, presumably via the epsilon-amino group of lysine residues. Antibodies recognizing the 3alpha-hydroxy-5beta-steroid moiety of LCA were generated by immunizing rabbits with immunogens in which the carboxyl group of LCA was coupled to BSA via a 6-aminohexanoic acid and/or succinic acid spacer. The resulting antibodies reacted with N-alpha-(t-butoxycarbonyl)-l-lysine-epsilon-LCA, the amidated and nonamidated forms of LCA, as well as synthetically prepared LCA adducts with ovalbumin and lysozyme. Proteins tagged with LCA in the liver of bile duct-ligated rats were isolated by immunoprecipitation using these antibodies. Proteins were isolated by two-dimensional electrophoresis, and their structure was identified using matrix-assisted laser desorption ionization time-of-flight mass spectrometry and computer-assisted programs. Proteins labeled with LCA were Rab-3, Rab-12, Rab-16, and M-Ras. Rab proteins are Ras-like small GTP binding proteins that regulate vesicle trafficking pathways. The covalent binding of the Rab proteins with LCA may influence vesicular transport or binding of vesicles to their cognate membrane and may contribute to LCA-induced liver toxicity.

Simultaneous determination of 17alpha-hydroxypregnenolone and 17alpha-hydroxyprogesterone in dried blood spots from low birth weight infants using LC-MS/MS.

17alpha-hydroxypregnenolone (17OHPreg) has heretofore been considered to be the major cause of the false elevated 17alpha-hydroxyprogesterone (17OHP) value in the immunoassay-based newborn screening for congenital adrenal hyperplasia (CAH). To verify this point, we developed a liquid chromatography-tandem mass spectrometric (LC-MS/MS) method that enables the simultaneous quantification of 17OHPreg and 17OHP in the dried blood filter papers and measured their blood levels in infants, especially in infants with low birth weights. Steroids were extracted from the filter papers with methanol, purified using a Strata-X cartridge, derivatized with 2-hydrazinopyridine and subjected to LC-MS/MS. Validation tests proved that this method was specific and reproducible; endogenous steroids did not interfere with the quantifications, and the intra- and inter-assay coefficients of variation were below 5.2%. The limits of quantitation were 1.0 and 0.5 ng/mL for 17OHPreg and 17OHP, respectively, when 3 disks (3 mm in diameter) of the filter papers (corresponding to 8 microL of whole blood) were used. The blood 17OHPreg level was elevated in the very low birth weight (1000-1500 g) infants and extremely low birth weight (<1000 g) infants, compared to those in the normal birth weight (>2500 g) infants (P<0.05). However, the 17OHPreg concentration was not high enough to cause the false positive results in the enzyme immunoassay-based screening, and it was considered that the false positive results come from other endogenous components rather than 17OHPreg.