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Biomedical subjects

J Søndergaard

Publications and source records attributed to J Søndergaard.

At least 55 records · Page 3Linked to original sources
PubMed1983

Prostaglandin E1 in normal human skin: methodological evaluation, topographical distribution and data related to sex and age.

A methodological evaluation of a radioimmunoassay technique for PGE1 measurement was applied to normal human skin. The detection limit of the assay was 15 pg and recovery (mean +/- SD) was 90 +/- 6%. The mean value of PGE1 (+/- SEM) in nine punch biopsy specimens (4 mm in diameter) from a piece of skin surgically removed from one person was 117 +/- 14 pg/mg dry weight. The individual variation of PGE1 activity in biopsy specimens from the same topographical area in ten persons belonging to the same sex and age group was 33 +/- 4 pg/mg dry weight. The influence has been elucidated of temperature and tissue processing, local anaesthesia, sex, age and topographical distribution on endogenous PGE1 activity.

Adult↗
PubMed1983

Treatment of rheumatoid arthritis with prostaglandin E1 precursors cis-linoleic acid and gamma-linolenic acid.

20 patients with active rheumatoid arthritis were treated for 12 weeks with the prostaglandin E1 precursors cis-linoleic acid and gamma-linolenic acid in the form of primrose evening oil (Efamol) and the co-factors zinc, ascorbic acid, niacin, and pyridoxin (Efavit). There was a slight fall in skin reactivity to UV light during the treatment, but no effect on plasma or urine concentrations of PGE1, cAMP or cGMP. There was no effect of the treatment on ESR, P-fibrinogen, number of tender joints, number of swollen joints, the duration of morning stiffness, or on the patient's estimation of pain.

Adult↗
PubMed1982

Severe acquired immunodeficiency in European homosexual men.

Four previously healthy Danish homosexual men developed Kaposi's sarcoma or opportunistic infections with fever of unknown origin and lymphadenopathy. One patient died of a Pneumocystis carinii pneumonia. Three patients had defective cell-mediated immunity with absent leucocyte interferon production and decreased proliferative response to mitogens and antigens. T lymphocyte helper subsets and natural killer cell activity were reduced. Unstimulated mononuclear cells produced leucocyte migration inhibitor factor. Two patients were sexual partners and three had never been to the USA, where cases of severe acquired immunodeficiency have been reported. Thus, the syndrome must also be suspected in European homosexual men who present with fever of unknown origin, opportunistic infections, or Kaposi's sarcoma.

Adult↗
PubMed1982

Heat-separation of normal human skin for epidermal and dermal prostaglandin analysis.

Heat-separation was introduced as a simple, reliable method of obtaining pure epidermis and dermis for prostaglandin (PG) analysis. Heating of normal human skin at 60 degrees C for 1 min resulted in a distinct separation of the epidermis from the dermis. After heat-separation the mean concentration +/- SEM of PGE1 activity in normal epidermal tissue was 2906 +/- 281 pg/mg dry weight. The PGE1 level in the corresponding dermal samples was 30 +/- 4 pg/mg dry weight and the mean leakage of PGE1 from the tissue into the buffer used during heating was 426 +/- 54 pg/ml.

Alprostadil↗
PubMed1982

The effect of leukotriene C4 and D4 on cutaneous blood flow in humans.

Using a laser-Doppler-flowmeter the microvascular response to LTC4 and LTD4 was measured. Intradermal injection of 1 microgram LTC4 and LTD4 caused an increase in the microvascular cutaneous bloodflow. The increase in flow was equal to that caused by histamine in equimolar amounts. Blocking the triple-response did not change the response. The values measured after injection of histamine and leucotrienes were about 10-15 times the values found in undisturbed skin and represents probably a maximally dilated vascular bed. Injection of the leucotrienes caused a slight sensation of pain.

Adult↗
PubMed1981

Prostaglandin E1 in suction-separated human epidermal tissue in primary irritant dermatitis.

Experimental dermo-epidermal separation by suction was performed on primary irritant dermatitic and normal symmetrical skin areas. Primary irritant dermatitis was induced by 24-hour patch tests with an aqueous 10% benzalconium chloride solution in 12 healthy volunteers. PGE1 activity in the epidermis, dermis and blister exudate was measured by a radioimmuno assay technique. The mean values in the epidermis (blister roof) was 1.57 ng/mg dry weight, dermis (blister base) 0.08 ng/mg dry weight and suction exudate (blister base) 0.08 ng/mg dry weight and suction exudate (blister fluid) 1.61 ng/ml. The corresponding control values were: in epidermis 0.86 ng/mg dry weight, dermis 0.04 ng/ml dry weight and blister exudate 0.50 ng/ml. Thus significantly increased PGE1 activity (p less than 0.02) was measured in the suction-separated samples in primary irritant dermatitis and furthermore, the highest level of PGE1 activity was detected in epidermis.

Aged↗
PubMed1981

Human leukocyte mobilization and morphology in nickel contact allergy using a skin chamber technique.

An improved skin chamber technique has been devised and used for quantitative evaluation of the leukocyte mobilization rate (LMR). The method was applied in 10 nickel-hypersensitive patients exposed to nickel sulphate. Each patient served as his own control and for additional control purpose, 5 healthy individuals without nickel hypersensitivity were studied. The kinetics of the mobilized leukocytes were followed over a 48-hour period. After an initial lag phase of 2-4 hours, maximum migration was observed from the 24th to the 48th hour, with a wide interindividual variability in the number of mobilized cells at the time of maximum LMR response. The median cumulative leukocyte count was 1.412 x 10(6) leukocytes/cm2/48 h. In the same period a statistically significant increase in the basophils for all the nickel allergic patients was observed. In 8 out of 10 patients a statistically significant effect upon the lymphocytes could be demonstrated. Six of these 8 patients had an increased lymphocyte mobilization. Throughout the period the neutrophil granulocytes were the dominant cell type, although the number decreased as the number of basophils and lymphocytes increased. The chamber technique is a valuable means for quantitative evaluation of leukocyte mobilization and morphology in skin exudates during exposure to an allergen in delayed hypersensitivity reactions.

Adult↗
PubMed1980

Cromones in atopic dermatitis.

Three new cromones have been studied that are supposed to be better absorbed and to have a wider spectrum of anti-allergic activity than disodium cromoglycate. Pretreatment with i.d. injection of 10 microgram FPL 52758 significantly reduced the weal and flare reaction induced by specific antigen in 11 patients with atopic dermatitis. The weal and flare reaction was not reduced in the same patients when 1.5 mg of FPL 52758 was applied topically under occlusion for a 24-h period prior to challenge with antigen. The itch and slight pain caused by antigen injection was not experienced in the FPL 52758 pretreated areas. Preliminary clinical results were obtained with the cromone FPL 52757, but due to possible hepatotoxicity this trial was not completed. Another similar cromone without hepatotoxicity was used in a double blind within-patient study. Nine patients with mild to moderate atopic dermatitis were treated with FPL 57787 (5%) ointment and matching placebo ointment. No significant improvement was observed after 4 weeks of treatment with the cromone containing ointment.

Chromones↗
PubMed1979

DNA interstrand crosslinks visualized by electron microscopy in PUVA-treated psoriasis.

An electron microscopic method has been used to visualize crosslinks after total denaturation of DNA isolated from epidermis and dermis in patients with psoriasis treated with 8-methoxypsoralen (8-MOP) and irradiation with ultraviolet light at 360 nm (PUVA treatment). This technique enabled accurate measurement of the number and density of DNA interstrand crosslinks. 30 biopsies were studied and a total of 9503 DNA molecules were scored in the electron microscope. 6 patients were treated topically with 8-MOP and 10 were on systemic treatment and biopsies were obtained immediately after irradiation. 1% of the total DNA molecules examined contained 3 or more crosslinks. The overall frequency of crosslinks was almost identical in the epidermis (1.1%) and in the dermis (0.9%) and, furthermore, virtually the same in patients on topical and systemic PUVA treatment. The total number of crosslinks was of the same magnitude as those previously found by us in normal human skin. Thus, though the formation of interstrand DNA crosslinks can be considered as an indicator of damage of the genetic material, we were unable to demonstrate this as being a consequence of PUVA treatment using 8-MOP.

Adult↗
PubMed1979

Fibrinogen/fibrin degradation products in exudates from bullous dematoses.

Inflammatory exudates from 10 patients with bullous skin diseases were analysed by immunochemical techniques including crossed immunoelectrophoresis. The results were compared with those obtained in fluid from suction bullae obtained in normal skin in 13 control subjects and synovial fluid from 20 patients with rheumatoid arthritis. Abnormal fibrinogen degradation products identical with those found in synovial fluid from patients with rheumatoid arthritis were detected in exudates from each of the patients with bullous dermatoses, whereas significantly smaller amounts of fibrinogen antigenic material were detected in fluid obtained by suction. The fibrinogen antigenic material demonstrated in exudates from pathological bullae, immunochemically similar to that found in rheumatoid synovial fluid, indicates that the presence of these products reflects the more general features of an inflammatory exudate.

Aged↗
PubMed1979

Cyclic AMP and psoriasis once more.

Imbalanced cyclic nucleotides are implicated as an underlying pathogenetic mechanism in psoriasis, but conflicting data on the levels of cAMP in psoriatic tissue have been obtained by different laboratories. Using heat separation and a competitive protein binding cAMP assay, a noticeably decreased epidermal level of cAMP was detected in newly formed guttate lesions in 10 patients with psoriasis (involved: 4.32 +/- 1.06 pmol/mg dry weight mean +/- S.E.M.). uninvolved: 7.97 +/- 1.63 pmol/mg dry weight mean +/- S.E.M.). In proliferative rat skin, bidirectional alterations in cAMP levels are known to occur. On the basis of present observation, we assume that the conflicting data hitherto obtained in psoriatic tissue similarly may merely reflect the various levels of cAMP at different developmental stages.

Adolescent↗