Biomedical subjects

N Atabey

Publications and source records attributed to N Atabey.

11 recordsLinked to original sources

PubMed2000

Evidence for Borrelia burgdorferi in morphea and lichen sclerosus.

BACKGROUND: Borrelia burgdorferi (Bb) infection has been implicated in the development of morphea and lichen sclerosus; however, conflicting results have been reported with different investigational methods from different regions. We looked for evidence of Bb in patients with morphea and lichen sclerosus by polymerase chain reaction (PCR) analysis of of skin biopsy samples. METHODS: Formalin-fixed, paraffin-embedded skin biopsy samples from 10 patients with morphea and 12 patients with lichen sclerosus were investigated by PCR analysis for the presence of Bb. RESULTS: The presence of Bb DNA was demonstrated in three of 10 patients with morphea and six of 12 patients with lichen sclerosus by nested PCR. CONCLUSIONS: The data obtained in this study suggest that Bb may play a role in the etiopathogenesis of both morphea and lichen sclerosus at least in the western parts of Turkey.

Adolescent↗

PubMed2000

Lack of TP53 mutations in a case of porokeratosis palmaris, plantaris et disseminata.

A 73-year-old man with porokeratosis palmaris, plantaris et disseminata is presented. He had punctate, guttate and annular hyperkeratotic papular lesions widespread on his body with thorn-like hyperkeratosis on the palms and soles. Lesional skin did not show mutations of TP53 exons 5-6, 7, 8.

Adolescent↗

PubMed1999

Heparan sulfate proteoglycan modulates keratinocyte growth factor signaling through interaction with both ligand and receptor.

Keratinocyte growth factor (KGF) is an unusual fibroblast growth factor (FGF) family member in that its activity is largely restricted to epithelial cells, and added heparin/heparan sulfate inhibits its activity in most cell types. The effects of heparan sulfate proteoglycan (HSPG) on binding and signaling by acidic FGF (aFGF) and KGF via the KGFR were studied using surface-bound and soluble receptor isoforms expressed in wild type and mutant Chinese hamster ovary (CHO) cells lacking HSPG. Low concentrations of added heparin (1 microgram/mL) enhanced the affinity of ligand binding to surface-bound KGFR in CHO mutants, as well as ligand-stimulated MAP kinase activation and c-fos induction, but had little effect on binding or signaling in wild type CHO cells. Higher heparin concentrations inhibited KGF, but not aFGF, binding and signaling. In addition to the known interaction between HSPG and KGF, we found that the KGFR also bound heparin. The biphasic effect of heparin on KGF, but not aFGF, binding and signaling suggests that occupancy of the HSPG binding site on the KGFR may specifically inhibit KGF signaling. In contrast to events on the cell surface, added heparin was not required for high-affinity soluble KGF-KGFR interaction. These results suggest that high-affinity ligand binding is an intrinsic property of the receptor, and that the difference between the HSPG-dependent ligand binding to receptor on cell surfaces and the HSPG-independent binding to soluble receptor may be due to other molecule(s) present on cell surfaces.

Animals↗

PubMed1998

Polymerase chain reaction in the diagnosis of parotid gland tuberculosis.

A parotid gland mass with presenting features of malignancy is a diagnostic and therapeutic challenge. The histological nature of the lesion must be clearly determined before proceeding with facial nerve sacrificing surgery. Although rare, tuberculosis of the parotid gland must be included in the differential diagnosis of a parotid gland mass especially when the social characteristics of the patient suggests a mycobacterial infection. Primary tuberculosis of the parotid gland is generally encountered among populations with a high incidence of pulmonary disease. The difficulty in the differential diagnosis of a parotid gland malignancy may be helped by a high degree of clinical suspicion, since laboratory tests generally do not identify the specific causative organism. This article reports the first case of parotid gland tuberculosis with clinical and radiodiagnostical features simulating malignancy in which the diagnosis was confirmed by the polymerase chain reaction (PCR).

Adult↗

PubMed1998

Scrofuloderma.

Explore the source record for details and available documents.

Biopsy↗

PubMed1996

Detection of Mycobacterium tuberculosis in formaldehyde solution-fixed, paraffin-embedded tissue by polymerase chain reaction in Pott's disease.

STUDY DESIGN: Twenty-five formaldehyde solution-fixed, paraffin-embedded tissue blocks from vertebral biopsy specimen materials with presumptive diagnosis of tuberculous spondylitis and nonspecific vertebral osteomyelitis were studied. OBJECTIVES: To evaluate the sensitivity and specificity of polymerase chain reaction in detecting Mycobacterium tuberculosis in formaldehyde solution-fixed, paraffin-embedded tissue samples from histologically proved tuberculous spondylitis. SUMMARY OF BACKGROUND DATA: Diagnosis of a mycobacterial infection is a long and tedious process; because of the slow growth rate of mycobacteria on solid media, identification and antibiotic sensitivity testing can take up to 10 weeks, but the sensitivity of culture can be as low as 50%. Direct microscopy is insensitive because clinical samples may contain only few organisms. Recently, polymerase chain reaction has been applied in the rapid amplification and identification of many organisms, including mycobacteria. METHODS: The DNAs were extracted from 25 paraffin-embedded tissue blocks. An insertion element IS 6110 (Integrated DNA Tec. Inc., Corrallville, IA), a DNA sequence unique to Mycobacterium complex (M. tuberculosis and the subspecies Mycobacterium bovis), was amplified by polymerase chain reaction. Polymerase chain reaction results were compared with those of Mycobacterium culture, acid-fast bacilli staining, and histologic findings. RESULTS: Polymerase chain reaction was positive in 18 cases of 19 tuberculous spondylitis. Three of the polymerase chain reaction test results were positive with concomitant negative culture and positive acid-fast bacilli staining. There were six chronic nonspecific infections, and polymerase chain reaction results were negative in five cases; in the single positive case, DNA amplification results remained positive even after three repeated tests. CONCLUSION: Polymerase chain reaction has a sensitivity of 94.7%, specificity of 83.3%, positive predictive value of 94.7%, and a negative predictive value of 83.3%. Accuracy was calculated as 92%.

Fixatives↗

PubMed1994

SCE frequency of herpes simplex virus type I infected cells.

The effects of herpes simplex virus type I (HSV-I) on SCE frequencies in human lymphocytes in vitro were investigated. SCE frequencies in controls (mean +/- 1SD 5.2 +/- 1.6) and in cells exposed to the virus for 3 and 6 h (mean +/- 1SD 5.3 +/- 1.6 and 5.8 +/- 1.6 respectively) were about the same. However, cells infected for 9 to 24 h showed a significant increase of SCE frequencies (p < 0.05).

Cells, Cultured↗

PubMed1991

[The effect of some antibiotics on primary antibody response].

In this study, effect of four broad spectrum antibiotics (sodium cefoperazone, sulbactam-ampicillin, mezlocillin, rifamycin) on primary antibody response. Therefore, sheep red blood cells were injected into total 25 rabbits in control and experiment groups. Hemolysin levels were titrated in serum specimens prepared from blood specimens taken before the experiment and taken three weeks after the last antigen injection. It was found that statistically significant in all the experiment groups rather than control (p less than 0.05).

Ampicillin↗

PubMed1990

[Antitoxin levels against tetanus in various age groups].

In this study, antitoxin levels against tetanus were examined in the sera of 261 male and 139 female subjects (totally 400 subjects) in the age range from one day to 85 years. Tetanus antitoxin titres were determined by Pitzurra et all. passive hemagglutination technique using turkey red blood cells. In the age group of 6-15 years, antitoxin levels were significantly higher than those of other groups and above 30 years old group this levels significantly below than the other groups (p less than 0.05). All groups of female, except the group under 5 years of age, had lower antitoxin levels than those male and this difference was found significant statistically (p less than 0.05).

Adolescent↗

PubMed1988

[The effect of blood on the activity of some antiseptics].

The effect of blood on the activity of 7.5% povidine-iodine, 4% chlorhexidine gluconate, 10% benzalconium chloride, 1.5% chlorhexidine gluconate with cetrimide mixture, dust detergent and soap has been investigated. Two experimental methods have been applied. Using the first experimental method, the activity of antiseptics with an absence and presence of 25% blood in vitro has been investigated. It has been observed that povidone-iodine no germicidal activity at all whereas the activities of the other antiseptics decreased in varying raties. In the second experiment, the effect of blood has been investigated while the activity of antiseptics continued on the residuent flora of the hands. The changes brought about by blood was not found to statistically significant.

Anti-Infective Agents, Local↗

PubMed1988

[Antimicrobial activity of antiseptics].

In the study, the antimicrobial activities of 7.5% povidone-iodine, 4% chlorhexidine gluconate, 1.5% chlorhexidine gluconate, 1.5% chlorhexidine gluconate with cetrimide mixture, 10% benzalconium chloride, dust detergent and soap as well as changes in activity in due course of time have been investigated. It has been observed that the effect of germicides on Staphylococcus aureus, Pseudomonas aeruginosa, Enterobacter cloacae and Candida strains increased in time. Soap had no germicidal effect. The difference between the of antiseptics on the residuent flora of the hands immediately and those two hours later was found to be statistically insignificant.

Anti-Infective Agents, Local↗