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At least 1,279 records · Page 71Linked to original sources
PubMed2006

Alpha-adducin and angiotensin-converting enzyme polymorphisms in hypertension: evidence for a joint influence on albuminuria.

BACKGROUND: A single-nucleotide polymorphism (Gly460Trp) within the alpha-adducin gene (ADD1) may influence several renal phenotypes, including salt sensitivity, susceptibility to renal failure, the renal haemodynamics and confer a worse cardiovascular risks profile. However, its relationship with microalbuminuria, a marker of early renal and cardiovascular damage and an independent predictor of morbid events in hypertension, is unknown. For this reason, we related the ADD1 genetic polymorphism to urine albumin levels and other clinical variables in essential hypertensive men. The angiotensin-converting enzyme (ACE) insertion/deletion (ID) polymorphism was also evaluated because of its interactive potential with the ADD1 genotype. METHODS: Albuminuria (three overnight collections), echocardiographic left ventricular mass index, blood pressure, body mass index, renal function, glucose and lipids were measured in 238 genetically unrelated, never treated, uncomplicated Caucasian essential hypertensive men. Polymerase chain reaction or a 5' nuclease assay were used to characterize the ACE ID and ADD1 Gly460Trp variants, respectively. RESULTS: Microalbuminuria (albuminuria >or= 15 microg/min) was more frequent in patients with the ACE DD variant, but only in those with a ADD1 Gly460Gly background. In contrast, urine albumin did not differ by ACE ID genotype in the presence of mutated ADD1 Trp alleles. ADD1 polymorphisms per se were not associated with albuminuria. Cardiovascular, renal, metabolic parameters were homogeneously distributed among different genetic backgrounds. CONCLUSIONS: ACE DD and ADD1 Gly460Gly polymorphisms may jointly influence albuminuria in hypertensive men, 460Gly homozygosis facilitating or, possibly, the 460Trp allele mitigating the noxious renal impact of the ACE DD genotype. The data highlight further the complex pathophysiological implications of microalbuminuria in hypertension.

Adult↗
PubMed2006

Polymorphisms of heat shock protein-70 (HSPA1B and HSPA1L loci) do not influence infection or outcome risk in critically ill surgical patients.

Heat shock proteins (HSP) are induced in various stress conditions and have many cytoprotective effects, including formation of protein complexes for antigen presentation, stabilizing intracellular proteins, and facilitating protein folding. The HSP-70 gene exhibits polymorphisms at the HSPA1B and HSPA1L loci that reportedly influence cytokine levels and clinical outcomes in critically ill patients. These HSP variations also have been linked to TNF-beta polymorphisms associated with poor outcomes. This study further evaluated outcomes and risk of infection of HSP polymorphisms in critically ill patients. Seventy-six consecutive surgical intensive care unit uninfected patients with established systemic inflammatory response features were prospectively enrolled. Genomic DNA was isolated from whole blood samples and specific fragments, including the relevant polymorphic sites, were amplified by PCR, and restriction digestions were performed. Genotypes were determined by electrophoresis and all were confirmed by direct sequencing. Plasma cytokine levels for TNF-alpha were assayed in a subset of patients by enzyme-linked immunoabsorbent assay. None of the HSP alleles bore a significant relationship to nosocomial infection rates, organ specific dysfunctions, or mortality. No linkage of HSP genotype to common TNF-alpha or TNF-beta genotypes could be demonstrated, although the HSPA1L CT polymorphism was associated with higher levels of TNF-alpha compared with the TT genotype. These data suggest that polymorphisms of the HSPA1L or HSPA1B loci do not influence infection or other highly morbid outcomes in surgical intensive care unit patients.

Aged↗
PubMed1996

A mutation of the circadian timing system (tau gene) in the seasonally breeding Syrian hamster alters the reproductive response to photoperiod change.

The tau mutation is a semi-dominant autosomal mutation which, in homozygotes, accelerates the period of the circadian activity cycle by approximately 4 h. In mammals, the circadian system contributes to seasonal photoperiodic time measurement by generating a repeated daily melatonin signal during the hours of darkness. Our earlier studies suggest an altered response to the melatonin signal in tau mutants. This study investigated whether tau and wild-type hamsters exhibit a differential response to photoperiod change. Reproductively active animals were maintained on stimulatory photoperiods of 16 h light (16L) per 24 h (wild-type) or 12L per 20 h (tau) before being exposed to an increase in night-length to 9, 10, 11, 12 or 14 h for 84 cycles. Wild-types exhibited testicular atrophy at 13L:11Dark (13L:11D), with full regression at photoperiods of 12L:12D. Taus exhibited complete regression at photoschedules comprising 10 h darkness or more per 20-h cycle. Plasma prolactin concentrations were decreased following exposure to at least 9 and 10 h darkness in taus and wild-types, respectively. Thus, the tau genotype may exhibit a different critical night-length with respect to both the gonadal and prolactin axes, of approximately 1-2 h shorter than wild-type genotypes. These data support the hypothesis that the circadian tau mutation has altered the basis of photoperiodic time measurement, perhaps by altering the generation and/or interpretation of the melatonin signal.

Animals↗
PubMed1999

Clostridium frigidicarnis sp. nov., a psychrotolerant bacterium associated with 'blown pack' spoilage of vacuum-packed meats.

Two strains of a psychrotolerant Clostridium, isolated from vacuum-packed, temperature-abused beef, were characterized using a multiphasic approach. The strains were Gram-positive motile rods producing elliptical subterminal spores during early stationary growth phase. The strains were psychrotolerant. At pH 7.0, they grew between 3.8 and 40.5 degrees C; their optimum growth temperature was 30.0-38.5 degrees C. At 30 degrees C, the pH range for growth was between 4.7 and 9.5; the optimum pH for growth was 6.4-7.2. The organisms were proteolytic and saccharolytic, lecithinase-positive and hydrolysed gelatin. The fermentation products formed in peptone/yeast extract/glucose/starch broth were acetate, ethanol, butyrate, isovalerate, butanol, isobutyrate, oxalacetate, lactate, hydrogen and carbon dioxide. The DNA G + C compositions of the two meat strains were 27.3 and 28.4 mol%. Phylogenetic analyses indicated that the strains belong to Cluster I of the genus Clostridium (sensu Collins et al., 1994). The new strains differed from phylogenetically related clostridia in terms of cellular fatty acid composition, soluble protein profiles and phenotypic properties. On the basis of phenotypic and genotypic characterization data, the strains were assigned to a new species for which the name Clostridium frigidicarnis is proposed; strain SPL77AT (= DSM 12271T) is the type strain.

Animals↗
PubMed2000

Clostridium algidixylanolyticum sp. nov., a psychrotolerant, xylan-degrading, spore-forming bacterium.

A psychrotolerant Clostridium species was isolated from vacuum-packed, temperature-abused raw lamb. Colonies of this micro-organism on sheep-blood agar were circular with an entire margin, grey-white, translucent and beta-haemolytic. Cells were single, tapered, motile rods. Elliptical subterminal spores were produced in the late stationary growth phase. Spores did not cause swelling of the maternal cells. The micro-organism was obligately anaerobic. In peptone yeast extract glucose starch (PYGS) broth at pH 7.0, the micro-organism grew optimally between 25.5 and 30.0 degrees C. The temperature range for growth was 2.5-32.2 degrees C. At 26 degrees C, the micro-organism grew optimally at pH 6.8 to 7.0. The pH range for anaerobic growth was 4.7-9.1. The micro-organism was saccharoclastic, hydrolysed starch and degraded xylan. The fermentation products formed in PYGS broth were acetate, formate, lactate, ethanol, butyrate, butanol, hydrogen and carbon dioxide. The G + C content of the DNA was 38.4 mol%. Phylogenetic analyses indicated that the strain belongs to cluster XIVa of the genus Clostridium (sensu Collins et al. 1994). The new strain differed from phylogenetically related clostridia in terms of cellular fatty acid composition, soluble protein profiles and phenotypic properties. On the basis of phenotypic and genotypic characterization data, the strain was assigned to a new species, namely Clostridium algidixylanolyticum. The type strain is strain SPL73T (= DSM 12273T).

Animals↗
PubMed2002

Therapeutic vaccination with vhs(-) herpes simplex virus reduces the severity of recurrent herpetic stromal keratitis in mice.

Virion host shutoff (vhs)-deficient herpes simplex virus (HSV) was tested as a therapeutic vaccine in a mouse model of UV light-induced recurrent herpetic stromal keratitis. Four weeks after primary corneal infection, mice were vaccinated intraperitoneally with vhs(-) vaccine or control. Four weeks after vaccination, the eyes of latently infected mice were UV-B irradiated to induce recurrent virus shedding and disease. Post-irradiation corneal opacity in latently infected, vhs(-)-vaccinated mice was significantly reduced compared to control-vaccinated mice (P=0.007 to 0.035). The incidence and duration of recurrent virus shedding were the same in both groups. Antibody titres were increased (P=0.05) and delayed type hypersensitive responses were unaffected by vhs(-) vaccination. Combined with studies using different vaccination timing and vhs(-) genotypes, these data suggest that deletion of vhs is a useful strategy in the development of a therapeutic HSV vaccine, and that temporal and genetic factors influence vaccination outcome.

Animals↗
PubMed2005

Nocardia jiangxiensis sp. nov. and Nocardia miyunensis sp. nov., isolated from acidic soils.

The taxonomic positions of two soil actinomycetes, strains 117(T) and 43401(T), provisionally assigned to the genus Nocardia were determined in a polyphasic study. The organisms were found to have phenotypic properties typical of members of the genus Nocardia, and formed a distinct branch in the Nocardia 16S rRNA gene tree. It was evident from the phylogenetic data that the isolates were most closely, albeit loosely, associated with the type strains of Nocardia nova and Nocardia pseudobrasiliensis. However, all four of these organisms were readily distinguishable from one another using DNA-DNA relatedness and phenotypic data. It is evident from the genotypic and phenotypic data that the two isolates should be recognized as novel species of the genus Nocardia. It is proposed, therefore, that strains 117(T) (=CGMCC 4.1904(T)=JCM 12860(T)) and 43401(T) (=CGMCC 4.1905(T)=JCM 12861(T)) be classified in the genus Nocardia as the type strains of Nocardia miyunensis sp. nov. and Nocardia jiangxiensis sp. nov., respectively.

Bacterial Typing Techniques↗
PubMed2006

Neutrotolerant acidophilic Streptomyces species isolated from acidic soils in China: Streptomyces guanduensis sp. nov., Streptomyces paucisporeus sp. nov., Streptomyces rubidus sp. nov. and Streptomyces yanglinensis sp. nov.

The taxonomic status of six neutrotolerant acidophilic streptomycetes isolated from acidic soils in Yunnan Province, China, was established using a polyphasic approach. The morphological and chemotaxonomic characteristics revealed that the isolates belong to the genus Streptomyces. Almost complete 16S rRNA gene sequences of the isolates were determined and aligned with available corresponding sequences of representatives of the family Streptomycetaceae; phylogenetic trees were inferred using four tree-making algorithms. The isolates formed a distinct, albeit heterogeneous, subclade in the Streptomyces 16S rRNA gene tree together with the type strain of Streptomyces yeochonensis, but were readily distinguishable from the latter using DNA-DNA hybridization and phenotypic data. It was evident from the genotypic and phenotypic data that the isolates belonged to four novel Streptomyces species, for which the following names are proposed: Streptomyces guanduensis sp. nov. (type strain 701T=CGMCC 4.2022T=JCM 13274T), Streptomyces paucisporeus sp. nov. (type strain 1413T=CGMCC 4.2025T=JCM 13276T), Streptomyces rubidus sp. nov. (type strain 13c15T=CGMCC 4.2026T=JCM 13277T) and Streptomyces yanglinensis sp. nov. (type strain 1307T=CGMCC 4.2023T=JCM 13275T); isolates 317 and 913 belong to this latter species.

Bacterial Typing Techniques↗
PubMed2006

Gordonia araii sp. nov. and Gordonia effusa sp. nov., isolated from patients in Japan.

Two bacterial strains, IFM 10211(T) and IFM 10200(T), were isolated from the sputum of two Japanese patients, and were subjected to a polyphasic taxonomic study. The two strains were found to have morphological, physiological and chemotaxonomic properties that were consistent with their assignment to the genus Gordonia, except for a few chemotaxonomic characteristics. Almost complete 16S rRNA gene sequences of the two strains were determined; the data showed that they are related distantly to Gordonia amarae, Gordonia hirsuta, Gordonia hydrophobica and Gordonia sihwensis, showing 16S rRNA gene sequence similarities to the type strains of these species of 96.2-97.9 %. DNA-DNA relatedness data coupled with the combination of genotypic and phenotypic data indicated that the two strains are representatives of two novel, separate species. The names proposed to accommodate these two strains are Gordonia araii sp. nov. (type strain IFM 10211(T)=DSM 44811(T)=NBRC 100433(T)=JCM 12131(T)) and Gordonia effusa sp. nov. (type strain IFM 10200(T)=DSM 44810(T)=NBRC 100432(T)=JCM 12130(T)).

Aged↗
PubMed2025

Gene model for the ortholog of Glys in Drosophila ananassae.

Gene model for the ortholog of Glycogen synthase (Glys) in the May 2011 (Agencourt dana_caf1/DanaCAF1) Genome Assembly (GenBank Accession: GCA_000005115.1) of Drosophila ananassae. This ortholog was characterized as part of a developing dataset to study the evolution of the Insulin/insulin-like growth factor signaling pathway (IIS) across the genus Drosophila using the Genomics Education Partnership gene annotation protocol for Course-based Undergraduate Research Experiences.

Bioinformatics↗
PubMed2025

Gene model for the ortholog of Ilp4 in Drosophila eugracilis.

Gene Model for Insulin-like peptide 4 (Ilp4) in the D. eugracilis (DeugGB2) assembly (GCA_000236325.2). The characterization of this ortholog was carried out as part of a larger, ongoing dataset designed to explore the evolution of the insulin/insulin-like growth factor signaling (IIS) pathway across the genus Drosophila, utilizing the Genomics Education Partnership gene annotation protocol within Course-based Undergraduate Research Experiences.

Bioinformatics↗
PubMed2025

Gene model for the ortholog of foxo in Drosophila sechellia.

Gene model for the ortholog of forkhead box, sub-group O (foxo) in the May 2011 (Broad dsec_caf1/DsecCAF1) Genome Assembly (GenBank Accession: GCA_000005215.1) of Drosophila sechellia. This ortholog was characterized as part of a developing dataset to study the evolution of the Insulin/insulin-like growth factor signaling pathway (IIS) across the genus Drosophila using the Genomics Education Partnership gene annotation protocol for Course-based Undergraduate Research Experiences.

Bioinformatics↗
PubMed1993

Effects of Inhibitors of Protein Serine/Threonine Phosphatases on Pollination in Brassica.

We have examined the effect of the protein phosphatase inhibitors okadaic acid and microcystin on pollen-pistil interactions in Brassica. Inhibitor-treated flowers or floral buds were pollinated with untreated pollen and examined for pollen tube growth by fluorescence microscopy. Our results show that type 1 or type 2A serine/threonine phosphatases play a crucial role in the pollination responses of Brassica. We observed two distinct effects of protein phosphatase inhibitors on pollination: (a) the inhibition of pollen tube growth during cross-pollination in flowers, and (b) the break-down of self-incompatibility or promotion of pollen tube growth during self-pollination in flower buds just prior to anthesis. Thus, treatment of flower pistils with protein phosphatase inhibitors resulted in the inhibition of pollen tube growth at the surface of the papillar cells of the stigma in crosses between different self-incompatible Brassica oleracea strains, in an interspecific cross between B. oleracea and Brassica campestris, and in self-pollinations of a self-fertile Brassica napus cultivar. With four different self-incompatibility genotypes, treatment of mature flowers with protein phosphatase inhibitors had no effect on self-pollination response. In contrast, treatment of flower buds just prior to the anthesis stage allowed self-pollen tube invasion of papillar cells. However, the magnitude of this effect was genotype dependent, being most pronounced in the S22 genotype. The data support the conclusion that pollinations in Brassica are controlled in part by the presence of phosphorylated proteins in the papillar cells of the stigma, and that the quantity of these proteins or their levels of phosphorylation changes during stigma development.

Journal Article↗
PubMed2003

Cytonuclear coadaptation in Drosophila: disruption of cytochrome c oxidase activity in backcross genotypes.

The cytochrome c oxidase enzyme (COX) is comprised of 10 nuclear-encoded subunits and three mitochondrial-encoded subunits in close physical association in the inner mitochondrial membrane. COX passes electrons from cytochrome c to molecular oxygen and pumps protons into the inner mitochondrial space for ATP production. Selection on nuclear-mitochondrial interactions within species should lead to coadaptation of the proteins comprising this important enzyme. Under this model, there should be relatively little disruption of COX activity when mitochondrial genomes are crossed among strains within species. A more pronounced disruption of activity is expected when the mitochondrial genome is expressed in the nuclear background of a different species. We test these hypotheses in Drosophila using hybridization and backcrossing among lines of D. simulans and D. mauritiana. Disrupted cytonuclear genotypes were constructed using backcrosses between two lines of D. simulans (siI and siII) that introduced each divergent mitochondrial DNA (mtDNA) into each nuclear background due to maternal inheritance of mtDNA. Similar crosses were used to introduce each D. simulans mtDNA into the D. mauritiana maI nuclear background. Reconstituted cytonuclear control genotypes were constructed by backcrossing the initial F1 females to males of the maternal genotype. COX enzyme activities were compared among these disrupted and reconstituted backcross genotypes within and between species. The disruption effect on COX activity was restricted to males of interspecific genotypes. These data support the coadaptation hypothesis and are consistent with predictions that the evolution of modifiers of male mitochondrial dysfunction is hindered by the maternal inheritance of mtDNA. New sequence data for nuclear encoded subunits of COX identified amino acids that may play a role in the disruption effect.

Adaptation, Biological↗
PubMed2005

Melanocytes derived from patients with Hermansky-Pudlak Syndrome types 1, 2, and 3 have distinct defects in cargo trafficking.

Hermansky-Pudlak Syndrome (HPS) is a genetically heterogeneous disorder in which mutations in one of several genes interrupts biogenesis of melanosomes, platelet dense bodies, and lysosomes. Affected patients have oculocutaneous albinism, a bleeding diathesis, and sometimes develop granulomatous colitis or pulmonary fibrosis. In order to assess the role of HPS genes in melanosome biogenesis, melanocytes cultured from patients with HPS subtypes 1, 2, or 3 were assessed for the localization of various melanocyte proteins. Tyrosinase, Tyrp1, and Dct/Tyrp2 were atypically and distinctly expressed in HPS-1 and HPS-3 melanocytes, whereas only tyrosinase showed an atypical distribution in HPS-2 melanocytes. The HPS1 and AP3B1 (i.e., HPS-2) gene products showed no expression in HPS-1 and HPS-2 melanocytes, respectively, whereas HPS-3 melanocytes exhibited normal expression for both proteins. In normal human melanocytes, the HPS1 protein was expressed as an approximately 80 kDa molecule with both granular and reticular intracellular profiles. In HPS-1, lysosome associated membrane protein 1 (LAMP1), and LAMP3 were localized to abnormal large granules; in HPS-2, all LAMPs exhibited a normal granular expression; and in HPS-3, LAMP1, and LAMP3 exhibited a distinct less granular and more floccular pattern. In contrast, the expressions of Rab 27, transferrin, and cKit were unaffected in all three HPS genotypes. These data demonstrate that the three initially identified subtypes of human HPS exhibit distinct defects in the trafficking of various melanocyte-specific proteins.

Adaptor Protein Complex 3↗
PubMed2006

Effect of CYP3A5 polymorphism on tacrolimus metabolic clearance in vitro.

Previous investigations of solid organ transplant patients treated with tacrolimus showed that individuals carrying a CYP3A5*1 allele have lower dose-adjusted trough blood concentrations compared with homozygous CYP3A5*3 individuals. The objective of this investigation was to quantify the contribution of CYP3A5 to the hepatic and renal metabolic clearance of tacrolimus. Four primary tacrolimus metabolites, 13-O-desmethyl tacrolimus (13-DMT) (major), 15-O-desmethyl tacrolimus, 31-O-desmethyl tacrolimus (31-DMT), and 12-hydroxy tacrolimus (12-HT), were generated by human liver microsomes and heterologously expressed CYP3A4 and CYP3A5. The unbound tacrolimus concentration was low (4-15%) under all incubation conditions. For CYP3A4 and CYP3A5, V(max) was 8.0 and 17.0 nmol/min/nmol enzyme and K(m,u) was 0.21 and 0.21 muM, respectively. The intrinsic clearance of CYP3A5 was twice that of CYP3A4. The formation rates of 13-DMT, 31-DMT, and 12-HT were >or=1.7-fold higher, on average, in human liver microsomes with a CYP3A5*1/*3 genotype compared with those with a homozygous CYP3A5*3/*3 genotype. Tacrolimus disappearance clearances were 15.9 +/- 9.8 ml/min/mg protein and 6.1 +/- 3.6 ml/min/mg protein, respectively, for the two genotypes. In vitro to in vivo scaling using both liver microsomes and recombinant enzymes yielded higher predicted in vivo tacrolimus clearances for patients with a CYP3A5*1/*3 genotype compared with those with a CYP3A5*3/*3 genotype. In addition, formation of 13-DMT was 13.5-fold higher in human kidney microsomes with a CYP3A5*1/*3 genotype compared with those with a CYP3A5*3/*3 genotype. These data suggest that CYP3A5 contributes significantly to the metabolic clearance of tacrolimus in the liver and kidney.

Algorithms↗
PubMed2004

Memantine improves spatial learning in a transgenic mouse model of Alzheimer's disease.

Memantine, a low- to moderate-affinity uncompetitive N-methyl-D-aspartate receptor antagonist, has been shown to improve learning and memory in several pharmacological models of Alzheimer's disease (AD). In the present study, the effect of memantine on locomotor activity, social behavior, and spatial learning was assessed in a transgenic mouse model of AD. Eight-month-old male C57BL/6J mice carrying mutated human APP and PS1 genes (APP/PS1) and their nontransgenic (NT) litter mates were administered a therapeutic dose of memantine (30 mg/kg/day p.o.) for 2 to 3 weeks. At this age, APP/PS1 mice show elevated levels of beta-amyloid peptides in several brain regions. APP/PS1 mice exhibited less exploratory rearing and increased aggressive behavior compared with NT mice. In the water maze test for spatial learning, APP/PS1 mice had longer escape latencies to both hidden and visible platforms, but they did not differ from NT mice in their swimming speed. Memantine significantly improved the acquisition of the water maze in APP/PS1 mice without affecting swimming speed. Memantine did not affect either locomotor activity or aggressive behavior in either genotype. These data indicate that memantine improves hippocampus-based spatial learning in a transgenic mouse model of AD without producing nonspecific effects on locomotion/exploratory activity.

Aggression↗
PubMed2006

Staphylococcal cassette chromosome mec (SCCmec) typing of methicillin-resistant Staphylococcus aureus strains isolated in 11 Asian countries: a proposal for a new nomenclature for SCCmec elements.

A description of staphylococcal cassette chromosome mec (SCCmec) elements carried by 615 methicillin-resistant Staphylococcus aureus (MRSA) strains isolated in 11 Asian countries is reported, and a novel nomenclatural system based on their structures is proposed. The 615 strains were classified as type 3A (370 strains), type 2A (207 strains), type 2B (32 strains), type 1B (1 strain), and nontypeable (5 strains). The previously reported type III SCCmec (DDBJ/EMBL/GenBank accession no. AB037671) carried by the MRSA strain 85/2082 was ascertained to be composed of two SCC elements, type 3A SCCmec and SCCmercury. PCR analysis indicated that 310 of 370 type 3A SCCmec strains carried both SCC elements. These strains were prevalent in eight countries: Thailand, Sri Lanka, Indonesia, Vietnam, Philippines, Saudi Arabia, India, and Singapore. The remaining 60 type 3A SCCmec strains differed with respect to the left extremity polymorphism or to the presence of ccrC. Among these, two were identified as carrying only type 3A SCCmec elements, but their left extremities differed. Type 2A SCCmec strains predominated in Korea and Japan, although the frequency of the presence of ant(4')-1 gene downstream of mecA varied (53% for Korean strains; 93% for Japanese strains). Various SCCmec elements were identified in the tested strains, and limited numbers were identified by their multilocus sequence typing genotypes. These data suggest that numerous MRSA clones are disseminated in Asian hospitals, and these consist of minor clones that are presumed to have arisen locally and major clones that are presumed to have been introduced from other countries.

Asia↗