Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 66 (1996), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: In freely moving rats, the novel, selective dopamine (DA) D3 receptor agonist PD 128,907 dose-dependently [effective dose (ED25) = 0.07 mg/kg, s.c.] reduced dialysate levels of DA in the frontal cortex, a structure innervated by the ventral tegmental area (VTA). This action of PD 128,907 (0.16 mg/kg, s.c.) was abolished by a selective DA D3 receptor antagonist S 14297 (1.25 mg/kg, s.c.), which alone did not modify levels of DA. In contrast to S 14297, its inactive distomer, S 17777, did not modify the actions of PD 128,907. In addition, PD 128,907 dose-dependently and potently inhibited the firing rate of VTA-localized neurons in anesthetized rats (ED50 = 0.001 mg/kg, i.v.). S 14297, but not S 17777, completely reversed the actions of PD 128,907 (0.005 mg/kg, i.v.) with a 50% inhibitory dose of 0.03 mg/kg, i.v. and did not itself significantly modify the firing rate. In conclusion, these data provide the first direct evidence that DA D3 (auto)receptors modulate (inhibit) the release of DA in the frontal cortex.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 680 (1993), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 12 (2000), S. 0 
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Pindolol accelerates the clinical actions of selective serotonin reuptake inhibitors (SSRIs) in man, and modulates extracellular levels of monoamines in corticolimbic structures in rats. Herein, we examined its influence upon electrical activity of serotonergic, dopaminergic and adrenergic perikarya in the dorsal raphe nucleus (DRN), ventral tegmental area (VTA) and locus coeruleus (LC) of anaesthetized rats. In analogy to the serotonin1A (5-HT1A) agonist, 8-OH-DPAT (−100%), pindolol dose-dependently (0.063– 1.0 mg/kg) decreased (−70%) the firing rate of serotonergic neurons. The inhibitory action of pindolol was abolished by the selective 5-HT1A antagonist, WAY-100,635 (0.031 mg/kg). In contrast, 8-OH-DPAT (+26%) and pindolol (0.25–4.0 mg/kg, +60%) dose-dependently increased the firing rate of dopaminergic cells. Of 57 neurons recorded (pindolol, 2.0 mg/kg), 36 (63%) were excited, 11 (19%) were unaffected and 10 (18%) were inhibited. This variable influence could be attributed to regularly firing neurons in the parabrachial subdivision, inasmuch as all neurons in the paranigral subnucleus were excited. The facilitation of firing by pindolol was accompanied by an increase in burst firing throughout the VTA. Both the increases in burst firing and in firing rate were reversed by WAY-100,635 (0.031 mg/kg). Finally, the electrical activity of adrenergic neurons was dose-dependently enhanced by 8-OH-DPAT and pindolol (+99% and +83%, respectively). WAY-100,635 reversed this excitation and, itself, inhibited the activity of adrenergic neurons. In conclusion, via engagement of 5-HT1A receptors, pindolol inhibits serotonergic, and activates dopaminergic and adrenergic, neurons in anaesthetized rats. Such actions may contribute to its influence upon mood, both alone and in association with antidepressant agents.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Mirtazapine displayed marked affinity for cloned, human α2A-adrenergic (AR) receptors at which it blocked noradrenaline (NA)-induced stimulation of guanosine-5′-O-(3-[35S]thio)-triphosphate ([35S]-GTPγS) binding. Similarly, mirtazapine showed high affinity for cloned, human serotonin (5-HT)2C receptors at which it abolished 5-HT-induced phosphoinositide generation. Alpha2-AR antagonist properties were revealed in vivo by blockade of UK-14,304-induced antinociception, while antagonist actions at 5-HT2C receptors were demonstrated by blockade of Ro 60 0175-induced penile erections and discriminative stimulus properties. Mirtazapine showed negligible affinity for 5-HT reuptake sites, in contrast to the selective 5-HT reuptake inhibitor, citalopram. In freely moving rats, in the dorsal hippocampus, frontal cortex (FCX), nucleus accumbens and striatum, citalopram increased dialysate levels of 5-HT, but not dopamine (DA) and NA. On the contrary, mirtazapine markedly elevated dialysate levels of NA and, in FCX, DA, whereas 5-HT was not affected. Citalopram inhibited the firing rate of serotonergic neurons in dorsal raphe nucleus, but not of dopaminergic neurons in the ventral tegmental area, nor adrenergic neurons in the locus coeruleus. Mirtazapine, in contrast, enhanced the firing rate of dopaminergic and adrenergic, but not serotonergic, neurons. Following 2 weeks administration, the facilitatory influence of mirtazapine upon dialysate levels of DA and NA versus 5-HT in FCX was maintained, and the influence of citalopram upon FCX levels of 5-HT versus DA and NA was also unchanged. Moreover, citalopram still inhibited, and mirtazapine still failed to influence, dorsal raphe serotonergic neurons. In conclusion, in contrast to citalopram, mirtazapine reinforces frontocortical dopaminergic and corticolimbic adrenergic, but not serotonergic, transmission. These actions reflect antagonist properties at α2A-AR and 5-HT2C receptors.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 0196-9781
    Keywords: Melanocyte ; Melanoma ; Melanotropin ; POMC ; α-MSH
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 0248-4900
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background  Acute as well as chronic sun exposure induces biologically damaging effects in skin including photoageing and cancer. Ultraviolet (UV)A radiation is involved in this process; it is therefore important that sunscreen products provide efficient and stable protection in this range of wavelengths.Objectives  This study based on in vitro approaches was performed to demonstrate that photostability is an essential requirement to protect against UVA-induced genetic and dermal alterations.Methods  The protection afforded by two sunscreen products, differing with regard to their photostability, was studied using biological markers related to the genotoxic or photoageing impact of UVA or simulated solar UV radiation (UV-SSR). Comet assay was used to assess direct DNA breakage, photo-oxidized purines and lomefloxacin-induced DNA breaks in nuclei of normal human keratinocytes in culture. In similar conditions, detection of p53 accumulation was performed. The use of reconstructed skin in vitro allowed us to use a three-dimensional model to analyse the dermal and epidermal damage induced by UVA or UV-SSR exposure. Abnormal morphological features of the tissue as well as fibroblast alterations and matrix metalloproteinase-1 release induced by UV exposure have been studied after topical application of products on the skin surface.Results  The results showed that the photostable product afforded better protection with regard to all the criteria studied, compared with the photounstable product.Conclusions  These data demonstrate that the loss of absorbing efficiency within the UVA wavelength domain due to photoinstability may have detrimental consequences on cell function and lead to impairments that have been implicated in genotoxic events as well as in the photoageing process.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Periodontology 2000 2 (1989), S. 0 
    ISSN: 1600-0757
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Seven human melanoma metastases were extracted in order to check the possible presence of any α-melanocyte stimulating hormone (MSH) immunoreactivity. The aim of that study was to provide some explanation for, mainly, two observations that we have already made and reported: 1) increased plasma α-MSH levels in melanoma of tumour-bearing patients as compared with tumour-free patients; 2) the presence of specific α-MSH receptors on human melanoma cells in culture.We could measure large amounts of immunoreactive α-MSH in all tumours ranging from 0.31 to 4.27 pmoles per g of wet tissue. Further identification of the extracted material by high-performance liquid chromatography revealed compounds of higher molecular weight and more hydrophobic than synthetic α-MSH. In addition, purified extracts could also displace 125I-labelled α-MSH from its cellular binding sites in an α-MSH specific radio-receptor binding assay. Our findings would suggest a possible presence of some hormone precursor(s) inside the melanoma tumours.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Applied Radiation and Isotopes 44 (1993), S. 1219-1224 
    ISSN: 0969-8043
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    World journal of surgery 12 (1988), S. 345-348 
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Pour prévenir la récidive des sarcomes, la perfusion isolée a été employée après résection de 15 sarcomes des membres. Elle a concerné 6 liposarcomes, 4 sarcomes synoviaux, 2 fibrohistiocytomes malins, 1 sarcome de Kaposi, et 1 ostéosarcome (le seul cas de sarcome osseux). Le protocole thérapeutique a compris 2 étapes: (a) ablation de la tumeur avec une marge de sécurité suffisante passant à l' exterieur de la capsule tumorale, (b) puis après 3 à 8 semaines circulation extracorporelle pendant une heure de melphalan associé ou non à de 1 'actinomycine D sous hyperthermie modérée à 39–41°C. La médiane du temps de suivi a été de 30 mois. Quatre sur huit des récidives sarcomateuses ont récidivé à nouveau et ont vu se développer des métastases. Par contre, aucun malade qui n 'avait pas été traité préalablement n'a récidivé et un a présenté une dissémination tumorale sous la forme d'un liposarcome à foyers multiples. Onze sont encore en vie, la durée de la survie étant comprise entre 8 et 103 mois. Les auteurs concluent de ces faits que la circulation extracorporelle avec du melphalan associé ou non à de l'actinomycine D peut être considérée comme un traitement complémentaire du traitement chirurgical.
    Abstract: Resumen Con miras a la prevención de recurrencias, se aplicó perfusión aislada en 15 pacientes después de resección de sarcomas de las extremidades. El grupo incluyó 6 liposarcomas, 4 sinoviosarcomas, 2 fibrohistiocitomas malignos, 1 mesenquimoma maligno, 1 Kaposi, y 1 osteosarcoma (el único sarcoma óseo). Ocho sarcomas representaron recurrencia después de cirugía limitada y/o radioterapia. El programa terapéutico fue conducido en 2 etapas: (a) remoción del tumor con márgenes de seguridad por lo menos por fuera de la cápsula tumoral, seguida 3–8 semanas después de (b) perfusión aislada con melfalán con o sin actinomicina D bajo hipertermia moderada a 39–41°C por 1 hora. El promedio de seguimiento ha sido de 30 meses. Cuatro de los 8 sarcomas recurrentes presentaron la recurrencia de nuevo y desarrollaron metástasis distales. En contraste, ninguno de los pacientes que no habían recibido tratamiento previo presentó recurrencia y en uno se diseminó en la forma de un liposarcoma multicéntrico. Once permanecen vivos con supervivencia entre 8 y 103 meses. Nuestra conclusión es que la perfusión aislada con melfalán con o sin actinomicina D puede ser considerada como una terapia adyuvante de la cirugía.
    Notes: Abstract In order to prevent recurrence, isolation perfusion was applied in 15 patients after resection of sarcomas of the limbs. There were 6 liposarcomas, 4 synoviosarcomas, 2 malignant fibrohistiocytomas, 1 malignant mesenchynoma, 1 Kaposi, and 1 osteosarcoma (the only bone sarcoma). Eight sarcomas were recurrent after narrow surgery and/or radiotherapy. The treatment schedule was conducted in 2 steps: (a) removal of the tumor with safety margins at least outside the tumor capsule, followed 3–8 weeks later by (b) isolation perfusion with melphalan with or without actinomycin D under moderate hyperthermia at 39–41°C for 1 hour. Median follow-up time has been 30 months. Four of the 8 recurrent sarcomas recurred again and developed distal metastases. In contrast, none of the previously untreated patients recurred and 1 disseminated in the form of multicentric liposarcoma. Eleven are still alive with survival ranging from 8 to 103 months. It is concluded that isolation perfusion with melphalan with or without actinomycin D may be considered as an adjunct to surgery.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...