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  • 1
    Electronic Resource
    Electronic Resource
    Influence of intratubular pressure on proximal tubular compliance and capillary diameter in the rat kidney (1979)
    Springer
    Pflügers Archiv 382 (1979), S. 179-187 
    Details
    ISSN: 1432-2013
    Keywords: Tubular compliance ; Capillary diameter ; Tubular diameter ; Rat kidney
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Tubular compliance is the response of tubular diameter to changes in intratubular pressure [7]. Proximal tubular compliance was determined directly by measurements of tubular diameter and pressure and indirectly using a mathematical model of tubular fluid flow based on measurements of the hydraulic pressure gradients along the tubule under free flow conditions and during an induced pressure reduction at the end of the proximal tubule. The two independent methods yielded similar values for compliance. Proximal tubular complicance was found to depend upon the intratubular pressure: tubular compliance was significantly higher (P〈0.001) when the intratubular pressure was reduced below normal (1.0 μm cm H2O−1) than when the pressure was increased above the control value (0.4 μm cm H2O−1) Almost identical compliance values were measured in sodium pentobarbital and inactin anaesthetized rats (P〉0.8). Intratubular pressure changes resulted in inverse changes in the diameters of the adjacent capillaries, suggesting that the peritubular capillaries are distensible structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00584220
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Angiotensin II induced reduction of peritubular capillary diameter in the rat kidney (1977)
    Springer
    Pflügers Archiv 371 (1977), S. 245-250 
    Details
    ISSN: 1432-2013
    Keywords: Angiotensin II ; Capillary contractility ; Rat kidney
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Large peritubular capillaries were infused consecutively (20 nl · min−1) in random sequence with isotonic saline and angiotensin II (20–80 ng · ml−1). The diameters of the infused capillaries were measured, without knowledge of the infusate used, from colour photographs of the infused area. Angiotensin II induced a significant (p〈0.001) decrease in capillary diameter (Δ=−1.2±0.2 (SE) μm and Δ=−2.1±0.2 (SE) μm with 20 ng · ml−1 and 80 ng · ml−1 angiotensin II infusates, respectively). This decrease was shown to be independent of external tubular compression: separate experiments in which the surrounding tubules were collapsed by injection of oil blocks yielded similar results. The possibility that the observed reduction in diameter was caused by an angiotensin II induced change in capillary permeability to the staining solution was excluded, since the angiotensin II effect was unchanged when fluorescent dextran (mol. wt. 150000) was substituted for lissamin green. These experiments indicate that peritubular capillaries contract actively when infused with angiotensin II.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00586264
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The interstitial cells in the renal medulla of rat, rabbit, and gerbil in different states of diuresis (1978)
    Springer
    Cell & tissue research 189 (1978), S. 1-18 
    Details
    ISSN: 1432-0878
    Keywords: Kidney medulla ; Rat, rabbit, gerbil ; Interstitial cells ; Lipid droplets ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The inner zone of the renal medulla of rats, gerbils, and rabbits was investigated to determine whether or not there are any characteristic ultrastructural differences between the interstitial cells of these species. The effects on the interstitial cells of water deprivation and water loading were also investigated. In all three species, the Type 1 interstitial cells, the lipid containing cells, were abundant and their distribution and topographical relations as well as their general ultrastructure were similar. The previously reported significantly higher frequency in desert rats could not be confirmed. Although the lipid droplets of the interstitial cells were smaller in gerbils and rabbits when compared to rats, their fine structure was similar. Their electron dense outer zone was sometimes associated with a granular material and/or a lamellar material with a periodicity of about 40 Å resembling phospholipid “myelin figures”. Water-loaded rats showed a considerable increase in the number of lipid droplets when compared to dehydrated or untreated animals. In contrast, the interstitial cells of waterloaded gerbils and rabbits were depleted of lipid droplets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223117
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    Paper (German National Licenses)
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