An analysis of the action of lanthanum on aortic tissue from normotensive and spontaneously hypertensive rats

M. T. Goldberg, Christopher Triggle

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9 Citations (Scopus)

Abstract

Significant tension development resulting from the administration of lanthanum salts (La3+) to isolated aorta tissues was observed in preparations from the spontaneously hypertensive rat (SHR) but not in preparation from age-matched normotensive Wistar rats (NWR). The response to La3+ was significantly greater in tissues maintained in bicarbonate-buffered Krebs than observed in bicarbonate and phosphate-free HEPES-buffered Krebs. At least part of the La3+ response in the bicarbonate- and phosphate-buffered solutions was due to a pH shift and could be mimicked by raising the extracellular hydrogen ion (H+) concentration. However, a direct action of La3+ on excitation-contraction coupling could be observed in HEPES-buffered solutions where the addition of La3+ also resulting in tension development but no significant pH change; this action of La3+ was found to be resistant to inhibition by maintenance in a Ca2+-free medium and (or) D-600 pretreatment suggesting an intracellular action for La3+. The paradoxical response to both H+ and La3+ in the SHR aorta suggests that the muscle membrane may be more permeable to these ions and, in addition, suggests that the membrane and (or) intracellular calcium stores in this tissue may also be more labile than those in the normotensive controls.

Original languageEnglish
Pages (from-to)1084-1090
Number of pages7
JournalCanadian Journal of Physiology and Pharmacology
Volume55
Issue number5
Publication statusPublished - 1977
Externally publishedYes

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Lanthanum
Inbred SHR Rats
Bicarbonates
HEPES
Aorta
Phosphates
Gallopamil
Excitation Contraction Coupling
Intracellular Membranes
Wistar Rats
Salts
Maintenance
Ions
Calcium
Muscles
Membranes

ASJC Scopus subject areas

  • Physiology
  • Pharmacology

Cite this

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abstract = "Significant tension development resulting from the administration of lanthanum salts (La3+) to isolated aorta tissues was observed in preparations from the spontaneously hypertensive rat (SHR) but not in preparation from age-matched normotensive Wistar rats (NWR). The response to La3+ was significantly greater in tissues maintained in bicarbonate-buffered Krebs than observed in bicarbonate and phosphate-free HEPES-buffered Krebs. At least part of the La3+ response in the bicarbonate- and phosphate-buffered solutions was due to a pH shift and could be mimicked by raising the extracellular hydrogen ion (H+) concentration. However, a direct action of La3+ on excitation-contraction coupling could be observed in HEPES-buffered solutions where the addition of La3+ also resulting in tension development but no significant pH change; this action of La3+ was found to be resistant to inhibition by maintenance in a Ca2+-free medium and (or) D-600 pretreatment suggesting an intracellular action for La3+. The paradoxical response to both H+ and La3+ in the SHR aorta suggests that the muscle membrane may be more permeable to these ions and, in addition, suggests that the membrane and (or) intracellular calcium stores in this tissue may also be more labile than those in the normotensive controls.",
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AU - Triggle, Christopher

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N2 - Significant tension development resulting from the administration of lanthanum salts (La3+) to isolated aorta tissues was observed in preparations from the spontaneously hypertensive rat (SHR) but not in preparation from age-matched normotensive Wistar rats (NWR). The response to La3+ was significantly greater in tissues maintained in bicarbonate-buffered Krebs than observed in bicarbonate and phosphate-free HEPES-buffered Krebs. At least part of the La3+ response in the bicarbonate- and phosphate-buffered solutions was due to a pH shift and could be mimicked by raising the extracellular hydrogen ion (H+) concentration. However, a direct action of La3+ on excitation-contraction coupling could be observed in HEPES-buffered solutions where the addition of La3+ also resulting in tension development but no significant pH change; this action of La3+ was found to be resistant to inhibition by maintenance in a Ca2+-free medium and (or) D-600 pretreatment suggesting an intracellular action for La3+. The paradoxical response to both H+ and La3+ in the SHR aorta suggests that the muscle membrane may be more permeable to these ions and, in addition, suggests that the membrane and (or) intracellular calcium stores in this tissue may also be more labile than those in the normotensive controls.

AB - Significant tension development resulting from the administration of lanthanum salts (La3+) to isolated aorta tissues was observed in preparations from the spontaneously hypertensive rat (SHR) but not in preparation from age-matched normotensive Wistar rats (NWR). The response to La3+ was significantly greater in tissues maintained in bicarbonate-buffered Krebs than observed in bicarbonate and phosphate-free HEPES-buffered Krebs. At least part of the La3+ response in the bicarbonate- and phosphate-buffered solutions was due to a pH shift and could be mimicked by raising the extracellular hydrogen ion (H+) concentration. However, a direct action of La3+ on excitation-contraction coupling could be observed in HEPES-buffered solutions where the addition of La3+ also resulting in tension development but no significant pH change; this action of La3+ was found to be resistant to inhibition by maintenance in a Ca2+-free medium and (or) D-600 pretreatment suggesting an intracellular action for La3+. The paradoxical response to both H+ and La3+ in the SHR aorta suggests that the muscle membrane may be more permeable to these ions and, in addition, suggests that the membrane and (or) intracellular calcium stores in this tissue may also be more labile than those in the normotensive controls.

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