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Biomedical subjects

E Bohnert

Publications and source records attributed to E Bohnert.

29 records · Page 2Linked to original sources
PubMed1977

[Effects of UV-C and of 8-MOP + UV-A on the T- and B-population of human lymphocytes in vitro (author's transl)].

The transformation of UV-C irradiated leucocytes and lymphocytes by the mitogens Con A, PHA and PWM is measured by the 3H-Tdr. incorporation after 72 h incubation. Furthermore T- and B-cells are determined by the method of rosette formation. A clear inhibition of the cell activity is seen after irradiation of leucocytes with 450 mJ/cm(2) and of a lymphocyte suspension with 5-10 mJ/cm(2). There are no significant differences between the effects of the various mitogens. The number of T-cells decreases proportionality to the various intensity, the number of B-cells remain constant. Irradiation with UV-A + 8-MOP cause, equally for all mitogens, a dosis dependent inhibition of thymidine incorporation.

B-Lymphocytes↗
PubMed1977

Effects of 8-methoxypsoralen (8-MOP) and UVA on human lymphocytes.

Peripheral lymphocytes of 37 psoriatic patients are tested before and under PUVA treatment using as parameter the non specific stimulation effect of HgCl2 (10 microgram/ml) in culture, measuring the 3H-thymidine incorporation after the last 16 h of a 5-days culture. Oral 8-MOP in therapeutic doses is decreasing the lymphocyte stimulation as well as 8-MOP together with UVA irradiation during the first week of treatment. After 1 week, the stimulation is, on the contrary, significantly enhanced after irradiation. Lymphocytes isolated by centrifugation over Lymphoprep are submitted to PUVA conditions in petri dishes (Hank's solution 8-MOP 1 microgram/ml, irradiation with 350 nm, 93-372 mJ/cm2). The total cell number, the E-rosette formation (as marker for T-lymphocytes) and the EAC-rosette formation (as marker for B-lymphocytes) are determined. PUVA conditions have an energy dependent decreasing effect on the cell number, while the T- and B-cell proportions remain constant. UVA irradiation alone has such an effect only with high energies. 8-MOP without UVA has no significant influence on the cell number.

Humans↗
PubMed1975

[Excision repair in lymphocytes of psoriasis (author's transl)].

Psoriasis is a autosomal hereditary disease of the skin, which has been treated with a great number of possibly carcinogenic substances. No increase of maligonomies has been observed except for the tumors induced by arsenic. The question may be asked whether the psoriatic cell has additional or more effective mechanisms to eliminate onocogenic somatic mutations. In this study the capacity of the excision repair of circulating blood lymphocytes from 12 psoriatic patients has been investigated and compared to a control group of equal size. After irradiation with ultraviolet light, the lymphocytes are incubated with 3 H-thymidine and at various intervals the radioactivity in the cell material precipitated with perchloric acid is measured. It appears, that the excision reapir in lymphocytes from patients with psoriasis and normal persons is equal. In addition, the influence of hydroxyurea on the thymidine incorporation in lymphocytes has been studied.

Adult↗