Effect of Secretin on Colonic DNA Synthesis

Abstract
This study examined whether or not secretin inhibited pentagastrin stimulated growth of colonic mucosa in rats. Pentagastrin (250 .mu.g/kg) caused an approximate doubling of mucosal DNA synthesis which was completely prevented by secretin in doses of 37.5 and 75 U[unit]/kg. The effect of secretin was dose dependent and occurred with as little as 9 U/kg. Secretin had no effect on either DNA synthesis or content when administered by itself. The dose of 75 U secretin/kg also completely prevented a 60% increase in DNA content stimulated by pentagastrin.