AJP - Heart and Circulatory Physiology, Vol 252, Issue 1 47-H53, Copyright © 1987 by American Physiological Society

ARTICLES

Blood and isoproterenol reduce capillary permeability in cat hindlimb

P. D. Watson, M. B. Wolf and I. S. Beck-Montgomery

In an earlier study, plasma was observed to counteract the permeability-increasing effects of blood-free perfusion when papaverine was present in the perfusate. To determine if this plasma effect was still present in the absence of papaverine, cat hindlimbs were perfused with a blood-free albumin-electrolyte solution, and capillary filtration coefficient (CFC) was measured. These data were compared with CFC values obtained when blood, plasma, or isoproterenol were present in the albumin perfusate. In separate groups of animals, CFC was observed to be 0.017 +/- 0.006 (SD, n = 26) ml X min-1 X mmHg-1 X 100 g muscle-1 during blood-free albumin perfusion, 0.012 +/- 0.002 (n = 24) when blood was present, 0.014 +/- 0.003 when isoproterenol was present, and 0.010 +/- 0.002 (n = 33) when both blood and isoproterenol were present. In a separate study, it was observed that 1) isoproterenol could reduce CFC by 11% when added to blood-free perfusate, 2) plasma had a similar but smaller and more variable effect than isoproterenol, 3) plasma had no consistent effect on CFC when added to a blood-free albumin perfusate containing isoproterenol, and 4) blood could reduce CFC significantly (P less than 0.005), from 0.014 +/- 0.003 to 0.0094 +/- 0.002 (n = 7), when added to a blood-free albumin perfusate containing isoproterenol. It was concluded that, in the absence of papaverine, the principal CFC-reducing effect of blood lay in the cell fraction and that isoproterenol had a small CFC-reducing effect under blood-free conditions. This result contrasts with the plasma effect reported earlier.

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