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
    Springer
    Anatomy and embryology 192 (1995), S. 319-328 
    ISSN: 1432-0568
    Keywords: Harderian gland ; Rat ; G-protein ; Carbachol ; Extracellular calcium ion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We studied the secretory mechanism of the Harderian gland of rats. After perfusion with HEPES-buffered Ringer's solution containing NaF (10 mM) with AlCl3 (10 μM), a G-protein activator, the glandular cells of the Harderian gland showed massive exocytosis and apocrine-like protrusions on the luminal surface. Some of the secretory vacuoles aggregated within the cytoplasm, and large vacuoles were formed. Contraction of the myoepithelial cells covering the glandular endpieces caused a narrowing of the glandular lumina, which contained cytoplasmic fragments, and deformation of the basal contour of the glandular end-pieces. The basal regions of the glandular cells also bulged between the myoepithelial cells. Secretory vacuoles were also discharged to the lateral cell surface, and the intercellular spaces were dilated. The enhanced secretory activities of the glandular cells and the contraction of the myoepithelial cells were similar to those in rats stimulated with 10 μM carbachol (CCh). However, dilatation of the endoplasmic reticulum in glandular cells (type A cells), which leads to the formation of small vesicles, was observed in those glands stimulated by NaF+AlCl3, but not in those stimulated by CCh. Removal of Ca+2 from the perfusing HR or addition of EDTA (0.5 mM) diminished and inhibited NaF+AlCl3- or CCh-enhanced secretory activity of the glandular cells and also allayed the deformation of glandular cells caused by myoepithelial cell contraction. The present results demonstrate the involvement of G-proteins and Ca2+-influx in the lipid secretion of glandular cells and in the contraction of myoepithelial cells of the Harderian gland in rats.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 11 (1987), S. 89-94 
    ISSN: 1432-5195
    Keywords: Bone alloimplants ; Decalcified ; Osteoinduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Afin d'apprécier l'efficacité clinique des allogreffes osseuses décalcifiées en surface et totalement décalcifiées, nous avons comparé radiologiquement l'incorporation de ces deux types d'allogreffes dans le lit osseux récepteur chez des malades opérés de butée de la hanche. Nous nous sommes référés aux résultats cliniques obtenus avec des autogreffes. Dans tous les cas, les deux types d'allogreffes décalcifiées se sont bien incorporés à l'os réceptuer. Cependant, dans les cinq cas examinés, les allogreffes totalement décalcifiées se sont résorbées avec peu ou sans apposition d'os nouveau. En revanche, les allogreffes décalcifiées en surface ont été parfaitement incorporées, bien qu'il ait fallu plus d'un an pour obtenir cette incorporation. Ces constatations indiquent que, contrairement `a ce que l'on aurait pu attendre des résultats de l'expérimentation animale, la décalcification accrue des allogreffes osseuses réduit leur efficacité clinique.
    Notes: Summary The relative clinical efficacy of surface-decalcified and wholly decalcified bone alloimplants was studied by observing radiographically the incorporation of the two types into the recipient bone bed in cases of shelf arthroplasty of the hip joint. In all cases, the decalcified alloimplants were incorporated well in an intraskeletal site. However, in all five cases examined, wholly decalcified alloimplants in a paraskeletal site were resorbed with little or no new bone deposition. In contrast, surface-decalcified alloimplants in a paraskeletal site were consistently incorporated, though their complete integration required more than one year. These findings show that, contrary to the results in experimental animals, increased decalcification of bone alloimplants reduced their clinical efficacy.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 9 (1985), S. 181-188 
    ISSN: 1432-5195
    Keywords: Bone matrix gelatin ; Bone alloimplantation ; Osteoinduction ; Osteoconduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Une gélatine de matrice osseuse préparée par un traitement chimique séquentiel comportant une décalcification par l'acide chlorhydrique a été utilisée comme implant allogène dans le traitement des tumeurs osseuses, bénignes ou malignes, des dysplasies acétabulaires, des retards de consolidation, des pertes de substance traumatique, etc. Cette gélatine de matrice osseuse mise en place dans les cavités osseuses a été réhabitée avec succès 97 fois sur 99 (98%), à l'exclusion des cas d'infection ou de récidive de la tumeur. L'implant a également été placé à la surface de l'os, en inlay, dans 10 cas mais il s'est résorbé 5 fois, sans formation d'os. La réhabitation a été obtenue dans un délai de 6 à 33 mois (14,9 en moyenne). Une infection est survenue 5 fois sur 165 implantations (3%) sur des lésions osseuses antérieurement aseptiques. Une fièvre modérée persistant plus de dix jours après l'opération (traduisant probablement une réaction immunologique) a été observée 4 fois sur 160 implantations (2,5%), à l'exclusion des cas infectés. Les implants allogènes de matrice osseuse constituent donc un traitement efficace des pertes de substance osseuse avec un faible risque de complications, rejet ou infection.
    Notes: Summary Bone matrix gelatin, prepared by sequential chemical treatment including decalcification with 0.6 N hydrochloric acid [9], was used as an alloimplant for the treatment of benign bone tumours, tumorous conditions of bone, acetabular dysplasia, delayed union, traumatic bone defects and other disorders. The bone matrix gelatin implanted into bone defects was incorporated successfully in 98% of implantations, excluding cases of infection, tumour recurrence and recurrence of tumorous conditions. The material was also implanted into ten bone sites as an onlay but in five it was resorbed without new bone formation. The incorporation of the bone matrix gelatin into the recipient bed was completed from 6 to 33 months (average 14.9 months) after implantation. Wound infection complicated 5 of 165 implantations (3%) in previously uninfected sites. Low grade fever persisting after the tenth post-operative day (a probable sign of immunological reaction) occurred in 4 of 160 implantations (2.5%), excluding cases of infection. Alloimplants of bone matrix gelatin are thus effective in the treatment of bone defects. The risk of complication such as rejection or infection is low.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 285 (1996), S. 501-507 
    ISSN: 1432-0878
    Keywords: Key words: Harderian gland ; Apocrine secretion ; Myoepithelial cell ; NaF+AlCl3 ; Carbachol ; Papaverine ; Rat (Sprague Dawley)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Harderian glands of male albino rats were stimulated with secretagogues and examined by transmission and scanning electron microscopy for the purpose of studying the apocrine secretory mechanism. Rats in the control group were perfused with standard HEPES-buffered Ringer’s solution. Their glandular endpieces showed wide lumina that contained few secretory materials; spontaneous exocytosis was sometimes observed. However, there were no features suggestive of an apocrine secretory mechanism or myoepithelial cell contractions. After stimulation with NaF+AlCl3 or carbachol in HEPES-buffered Ringer’s solution, the rats shed ”bloody tears” and the glandular lumina were jammed with apical protrusions, cytoplasmic material and secretory products. The basal surface of the glandular cells showed bulging caused by myoepithelial cell contraction. Perfusion with HEPES-buffered Ringer’s solution containing papaverine inhibited secretagogue-induced myoepithelial cell contraction but not the enhanced secretory activities of the glandular cells. The present results demonstrate that the Harderian gland of the rat can release secretory material not only by exocytosis, but also by an apocrine mechanism under stimulating conditions, and that myoepithelial cell contraction may not be involved in causing apical protrusion in the glandular cells.
    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...