Uneven changes in circulating blood cell counts with adrenergic stimulation to the canine spleen.

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  • Additional Information
    • Source:
      Publisher: Wiley-Blackwell Country of Publication: Australia NLM ID: 0425076 Publication Model: Print Cited Medium: Print ISSN: 0305-1870 (Print) Linking ISSN: 03051870 NLM ISO Abbreviation: Clin Exp Pharmacol Physiol Subsets: MEDLINE
    • Publication Information:
      Publication: Oxford, England : Wiley-Blackwell
      Original Publication: Oxford, Blackwell Scientific Publications.
    • Subject Terms:
      Adrenergic Agonists/*pharmacology ; Blood Platelets/*drug effects ; Erythrocytes/*drug effects ; Leukocytes/*drug effects ; Spleen/*drug effects; Adrenergic alpha-1 Receptor Agonists ; Animals ; Blood Cell Count/methods ; Blood Cell Count/statistics & numerical data ; Blood Platelets/cytology ; Blood Platelets/physiology ; Dogs ; Erythrocytes/cytology ; Erythrocytes/physiology ; Female ; Leukocytes/cytology ; Leukocytes/physiology ; Male ; Receptors, Adrenergic, alpha-1/physiology ; Spleen/physiology
    • Abstract:
      1. Responses of splenic diameter measured by sonomicrometry to alpha- and beta-adrenoceptor stimulants were estimated together with simultaneously measured systemic arterial and splenic venous concentrations of red blood cells (RBC), white blood cells (WBC) and platelets (PLT) in anaesthetized dogs. 2. Intravenous and intrasplenic arterial injections of adrenaline, noradrenaline and phenylephrine all produced profound decreases in splenic diameter. Increases in systemic arterial concentrations of RBC produced by these stimulants were observed immediately following the splenic contraction and marked increases in splenic venous concentration of RBC. 3. Adrenaline and noradrenaline both caused rapid and transient decreases in WBC release from the spleen and these agonists then, in addition to phenylephrine, caused gradual and small increases in systemic arterial WBC concentrations. The increases in arterial RBC and WBC concentrations were abolished by transient isolation of the spleen from the systemic circulation. These three agents did not significantly modify differences between splenic venous and systemic arterial concentrations of PLT. 4. Intra-arterial injections of isoprenaline caused an increase in splenic diameter and a significant decrease in the splenic venous concentration of WBC, but barely influenced the veno-arterial differences in RBC and PLT concentrations across the spleen. 5. The present results indicate that contraction of the spleen through stimulation of splenic alpha1-adrenoceptors contributes to supplying RBC but not PLT into the systemic circulation, whereas splenic beta-adrenoceptor activation leads to splenic dilatation with increased sequestration of WBC to the spleen despite no changes in the release of RBC and PLT from the spleen.
    • Accession Number:
      0 (Adrenergic Agonists)
      0 (Adrenergic alpha-1 Receptor Agonists)
      0 (Receptors, Adrenergic, alpha-1)
    • Publication Date:
      Date Created: 20020322 Date Completed: 20020624 Latest Revision: 20190826
    • Publication Date:
      20240829
    • Accession Number:
      10.1046/j.1440-1681.2002.03598.x
    • Accession Number:
      11906460