Changes in Na,K-ATPase, sodium ion, and glucose transport in isolated enterocytes in an experimental model of malabsorption.

ABSTRACT

Nippostrongylus brasiliensis infection of the rat resulted, at day 10 of infection, in decreased levels of jejunal enterocyte sodium-potassium-activated adenosine triphosphatase (Na,K-ATPase) and potassium-activated p-nitrophenyl phosphatase (K-pNPPase) activities. Parallel decreases occurred in active sodium efflux from jejunal enterocytes in the presence and absence of actively transported monosaccharides. Ileal enterocyte Na,K-ATPase and K-pNPPase activities were significantly increased, as was active sodium efflux. In contrast to controls, the presence of monosaccharides produced a stimulation of active sodium efflux from ileal enterocytes derived from infected rats. Enzyme and sodium transport changes in the jejunal enterocytes probably reflect cellular immaturity. Functional changes in ileal enterocytes probably represent a compensatory phenomenon.