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Abstract

Abstract: DESCRIPTION (provided by applicant): Here, we propose to demonstrate the feasibility of ameliorating symptoms of cystic fibrosis (CE) by administration of pro-drugs to affected tissues that deliver analogs of specific intracellular messengers, namely inositol polyphosphates, which regulate ion channels. We will test the hypothesis that a membrane-permeant inositol polyphosphate analog, lNO-E2, modulates sodium channel activity. Proof of this concept in epithelia from human CF airways would indicate the suitability of this approach for development as a CF therapeutic. Thus the specific aims are: Specific Aim 1: Determine whether JNO-E2 effects on current flux is due to its effect on ENaC. To test this we will measure the dynamics of the effect of INO-E2 and determine if it mimics the effect of the sodium channel blocker, amiloride. Specific Aim 2: Determine whether INO-E2 alters the driving force for sodium flux across the membrane. This could occur through primary interaction with other ion channels such as Calcium-activated Cl- channels and K+ channels. Specific Aim 3: Determine whether lNO-E2 could alter basal lsc indirectly through down regulating the membrane expression of ENaC. This will be tested in studies in collaboration with Sherif Gabriel at UNC, who will measure ENaC activity and expression in Xenopus oocytes.

Thesaurus Terms:
chloride channel, chloride ion, cystic fibrosis, inositol phosphate, intracellular transport, ion transport, membrane permeability, sodium channel
potassium channel, prodrug, respiratory epithelium
Xenopus oocyte, clinical research, electrophysiology, human tissue, monoclonal antibody

Institution:	INOLOGIC, INC.
	3005 1ST AVE, STE 300
	SEATTLE, WA 98121
Fiscal Year:	2002
Department:
Project Start:	30-SEP-2002
Project End:	31-MAR-2003
ICD:	NATIONAL HEART, LUNG, AND BLOOD INSTITUTE
IRG:	ZRG1