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  • 3H-8-MOP time activity curves  (1)
  • ASA  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 273 (1982), S. 71-84 
    ISSN: 1432-069X
    Keywords: 3H-8-MOP ; DNA-RNA protein activity ; 3H-8-MOP time activity curves ; Rat organs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Tritiated 8-methoxypsoralen was given perorally to rats in amounts corresponding to therapeutic human doses. The rats were exposed to UVA light or kept in darkness. None of the fractions (apart from 3H2O from the lens) examined changed their level of radioactivity under the influence of UVA light. Time-radioactivity curves were recorded for the skin, lens, residual eye, and the liver. Four fractions were measured: 3H2O, soluble pool, DNA-RNA, and protein. Tritiated water appeared already 1 h after ingestion, and attained maximum value 9–24 h after ingestion, indicating the efficiency with which the liver degrades 8-MOP. 3H-8-MOP and metabolites could be detected in the soluble pool in maximum amounts 2–3 h after the administration. Pretreatment with trypsin increased the concentration of 3H-8-MOP and metabolites; the origin of this extra radioactivity was the protein fraction. The 3H-8-MOP binding to DNA or RNA was studied by pretreatments of the homogenates with DNase or RNase followed by measurement of radioactivity in the TCA extracts. This indicated that no measurable amount of 3H-8-MOP had been bound to DNA or RNA. We conclude that 8-MOP administered to rats in amounts corresponding to human therapeutic doses does not bind to DNA or RNA in measurable amounts either after UV-light or in darkness. The experiments have shown proteins to be the main binding site in rat organs.
    Type of Medium: Electronic Resource
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  • 2
    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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