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  • Sister chromatid exchange  (2)
  • ASA  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 263 (1978), S. 37-46 
    ISSN: 1432-069X
    Keywords: Sister chromatid exchange ; 8-MOP ; ultraviolet light ; Schwester-chromatiden-Austausch ; 8-MOP, langwelliges UV-Licht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die unmittelbare Wirkung von 8-Methoxypsoralen (8-MOP) sowie von 8-MOP+langwelligem UV-Licht (UVA) auf Schwesterchromatiden-Austausch (SCE) wurde in einem in vitro-Experiment untersucht. Der SCE nach 8-MOP allein war signifikant erhöht, aber die Wirkung war wesentlich größer (50%) nach der Behandlung mit 8-MOP+UVA. Dazu wurden nach der Behandlung mit 8-MOP-Mitosen mit «gestreifter» Färbung der Chromosomen beobachtet. Die Veränderungen sind dosisabhängig und bilden möglicherweise die Ursache für die nach PUVA-Behandlung verminderte Zellteilung in Psoriasisflecken.
    Notes: Summary The acute effect of 8-methoxypsoralen (8-MOP) and 8-MOP+long wave ultraviolet light (UVA) on sister chromatid exchange (SCE) has been examined in an in vitro experiment. The SCE count was significantly increased by 8-MOP without light, but the effect was substantially greater (50%) by 8-MOP+UVA. In addition, mitoses with banded staining of the chromosomes were seen after 8-MOP and UVA. These changes were dose dependent, and they might be responsible for the reduced cell turnover in psoriasis plaque after PUVA.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 279 (1987), S. 180-183 
    ISSN: 1432-069X
    Keywords: Multiple epidermal cancer ; Sister chromatid exchange ; Lymphocyte UVC sensitivity ; Lymphocyte X-ray sensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Exposure to toxins in the environment and due to personal habits, e. g., tobacco smoking, may increase the rate of spontaneous sister chromatid exchange (SCE). The SCE in lymphocytes from a group of 31 patients with multiple epidermal cancer, who in the past had been exposed to various skin carcinogens, as a whole exceeded that of a control group — matched by sex, age, and smoking habits — but the difference was not statistically significant (p=0.08). The individual SCE in these patients was also statistically independent of the nature of the carcinogenic exposure. We were unable to detect correlations between the SCE and UVC-radiation induced DNA synthesis, UVC-radiation tolerance, or rate of X-ray damage repair. This suggests that the molecular mechanisms involved in SCE induction and in repair of radiation damage are basically independent.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Der Schmerz 11 (1997), S. 345-352 
    ISSN: 1432-2129
    Keywords: Schlüsselwörter Capsaicin ; ASS ; Lokaltherapie ; Chronische Schmerzen ; Key words Capsaicin ; ASA ; topical administration ; chronic pain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Objective. To provide a brief review of the current state of topical treatment with capsaicin or acetylsalicylic acid (ASA) for therapy of chronic pain syndromes. Data Sources. A MEDLINE® search was used to find the pertinent literature on "capsaicin" or "ASA" and "chronic pain"; further publications found in these articles were added. Conclusions. Capsaicin is a white crystalline parent compound of a group of vanillyl fatty acid amines. Because of its highly specific action in neurons it has become an important tool in neuroscience. Because of its effects, it is obvious to try for the therapy of circumscribed neuropathic pain. Capsaicin acts by depleting stores of substance P and other neurotransmitters, resulting in a blockade of a specific group of sensory afferents. The corresponding clinical findings are initial burning and a desensitization of specific C fiber nociceptors after repeated application. The pain relieving potency was observed in various clinical investigations and even in a few controlled, double-blind studies about neuropathic pain syndromes and (osteo)arthritis. In contrast to these findings, a recent study found no significant benefit of capsaicin, probably because this study was the first to use an active placebo. Therefore, and because clinical efficacy and advantages over other therapies have not been demonstrated up to now, capsaicin cannot be classified as standard therapy. It may be a therapeutic option as an alternative or as an adjuvant treatment. Pain reduction was also observed after topical application of ASA/ether mixture in the one and only controlled double-blind study on this issue. Therefore, topical ASA therapy for (post)herpetic neuralgia is mainly based on a few enthusiastic case reports rather than on well founded investigations. Furthermore, the discrimination of local from systemic effects, the toxicological profile of longterm topical treatment, and the mechanism of action has not been evaluated. In conclusion, topical ASA cannot be recommended for routine clinical use at present.
    Notes: Zusammenfassung Ziel der vorliegenden Arbeit ware es, bisherige Untersuchungen zur Lokaltherapie chronischer Schmerzen mit Casaicin und Acetylsalicylsäure (ASS) zusammenzustellen und daraus entsprechend den Ausführungen von Tryba und Zenz eine Empfehlung im Sinne einer "evidence-based-medicine" abzuleiten. Eine Lokaltherapie mit ASS oder Capsaicin wurde meist bei neuropathischen Schmerzen, z.B. der postzosterische Neuralgie (PZN) versucht, die Capsaicin-Therapie auch bei Gelenkschmerzen. Die spezifischen Wirkungen von lokal appliziertem Capsaicin, z.B. die Freisetzung von Neurotransmittern, begründen die Erwartung klinisch relevanter Effekte bei chronischen Schmerzen. Demgegenüber erscheint die Rationale einer Lokaltherapie mit ASS weniger naheliegend. An Patienten wurde Capsaicin häufiger als ASS untersucht. Zielgröße der Untersuchungen war hauptsächlich die analgetische Wirksamkeit per se. Für Capsaicin gibt es Befunde über eine Analgesie aus plazebokontrollierten Studien. Allerdings ist in diesen wegen der (Neben-)Wirkung von Capsaicin – Hautbrennen nach initialer Anwendung – die Verblindung problematisch. Die bisher einzige Untersuchung mit aktivem Plazebo zeigte keine Wirksamkeit der Lokaltherapie. Neben positven Daten aus Fallberichten gibt eine plazebokontrollierte Untersuchung über die lokale Anwendung von ASS Anhalt für eine Analgesie bei der postherpetischen Neuralgie. Harte Daten zur Wirksamkeit und Unbedenklichkeit einer Langzeit-Therapie fehlen. Für beide Substanzen bleibt offen, welche klinische Relevanz etwaige positive Therapieeffekt haben und wie ihr Stellenwert gegenüber anderen Therapieverfahren ist. Insgesamt ist eine topische Behandlung mit Capsaicin bzw. ASS bisher nicht als fundierte Therapie zu bewerten.
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