Helicobacter aurati sp. nov., a Urease-Positive Helicobacter Species Cultured from Gastrointestinal  Tissues of Syrian Hamsters

A novel helicobacter with the proposed name Helicobacter aurati (type strain MIT 97-5075c) has been isolated from the inflamed stomachs and ceca of adult Syrian hamsters. The new species is fusiform with multiple bipolar sheathed flagella and periplasmic fibers; it contains urease and gamma-glutamyl transpeptidase. By 16S rRNA sequencing and repetitive element PCR-based DNA fingerprinting, it was found that H. aurati represents a distinct taxon and clusters with Helicobacter muridarum, Helicobacter hepaticus, and Helicobacter sp. MIT 94-022. H. aurati was recovered from hamsters housed in various research and vendor facilities. Further studies are necessary to define its association with disease and other microbiota in hamsters, as well as its impact on research projects involving hamsters. H. aurati (GenBank accession number AF297868) can be used in animal experiments to define the factors that are important for gastric helicobacter pathogenesis.

Download Full-text

Helicobacter mesocricetorum sp. nov., a Novel Helicobacter Isolated from the Feces of Syrian Hamsters

Journal of Clinical Microbiology ◽

10.1128/jcm.38.5.1811-1817.2000 ◽

2000 ◽

Vol 38 (5) ◽

pp. 1811-1817 ◽

Cited By ~ 32

Author(s):

J. H. Simmons ◽

L. K. Riley ◽

C. L. Besch-Williford ◽

C. L. Franklin

Keyword(s):

Alkaline Phosphatase ◽

Sequence Analysis ◽

Type Strain ◽

Rrna Gene ◽

The Novel ◽

Accession Number ◽

Syrian Hamsters ◽

Novel Bacterium ◽

Microaerobic Conditions ◽

The 16S Rrna Gene

A spiral-shaped bacterium with bipolar, single, nonsheathed flagella was isolated from the feces of Syrian hamsters. The bacterium grew as a thin spreading film at 37°C under microaerobic conditions, did not hydrolyze urea, was positive for catalase and alkaline phosphatase, reduced nitrate to nitrite, did not hydrolyze hippurate, and was sensitive to nalidixic acid but resistant to cephalothin. Sequence analysis of the 16S rRNA gene and biochemical and phenotypic criteria indicate that the novel bacterium is a helicobacter. The novel bacterium is most closely related to the recently described mouse enteric helicobacter, Helicobacter rodentium. This is the first urease-negative Helicobacter species with nonsheathed flagella isolated from feces of asymptomatic Syrian hamsters. We propose to name this novel helicobacter Helicobacter mesocricetorum. The type strain is MU 97-1514 (GenBank accession number AF072471).

Download Full-text

Relationship Between Gamma-glutamyl Transpeptidase Activity and Inflammatory Response in Lichen Planus

Revista de Chimie ◽

10.37358/rc.18.3.6189 ◽

2018 ◽

Vol 69 (3) ◽

pp. 739-743 ◽

Cited By ~ 3

Author(s):

Madalina Irina Mitran ◽

Ilinca Nicolae ◽

Corina Daniela Ene ◽

Cristina Iulia Mitran ◽

Clara Matei ◽

...

Keyword(s):

Inflammatory Response ◽

Lichen Planus ◽

Inflammatory Process ◽

Molecular Mechanisms ◽

Functional Adaptation ◽

Physical Factors ◽

Inflammatory Disorder ◽

Gamma Glutamyl Transpeptidase ◽

Gamma Glutamyl ◽

Glutamyl Transpeptidase

Chemicals used in the manufacture of synthetic fibers have been associated with undesirable side effects such as itching or skin lesions and it seems that they are involved in the induction of pathological processes such as oxidative stress and inflammation. Lichen planus (LP) can be regarded as an inflammatory disorder, chemical and physical factors playing an important role in the perpetuation of the inflammatory process. Gamma-glutamyl transpeptidase (GGT) plays an important role in the preservation of skin architecture and modulation of skin inflammation. In this study, we found that GGT activity is increased in LP patients with mild inflammation, whilst GGT is inactivated under conditions of severe inflammation. Therefore, GGT is involved in the inflammatory process, but there is no a positive correlation between its activity and the intensity of the inflammatory response. This functional adaptation of the enzyme may be due to down-regulation of its synthesis under free radical overload conditions. Understanding the molecular mechanisms involved in the modulation of intracellular redox homeostasis is an important step in the pharmacological management of patients with LP.

Download Full-text