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J Appl Physiol 71: 530-536, 1991;
8750-7587/91 $5.00
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Journal of Applied Physiology, Vol 71, Issue 2 530-536, Copyright © 1991 by American Physiological Society

ARTICLES

Activity of pulmonary surfactant after blocking the associated proteins SP-A and SP-B

T. Kobayashi, K. Nitta, R. Takahashi, K. Kurashima, B. Robertson and Y. Suzuki
Department of Anesthesiology, School of Medicine, Kanazawa University, Japan.

To investigate the role of the pulmonary surfactant-associated proteins SP-A and SP-B, the respective monoclonal antibody (anti-A or anti-B) was added to porcine pulmonary surfactant at a weight ratio of 1:2, and the mixtures were tested on surfactant-deficient immature newborn rabbits (gestational age 26 days). Under pentobarbital sodium anesthesia and mechanical ventilation with a 25-cmH2O peak insufflation pressure, the tidal volumes of the animals given surfactant alone and of those given surfactant containing anti-A were 27.9 +/- 5.1 and 25.1 +/- 9.6 (SD) ml/kg, respectively, whereas that of those given surfactant with anti-B was 5.8 +/- 3.6 ml/kg (P less than 0.05). The surface adsorption times of surfactant alone and of anti-A-containing surfactant were less than 0.8 s compared with greater than 120 s (P less than 0.01) for anti-B-containing surfactant. The anti-B suppressed the surfactant activity until the weight ratio was decreased to 2:100. The role of SP-A could not be clarified, but it was concluded that SP-B is an essential factor for surfactant activity.


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