Am J Physiol Cell Physiol AJP: Endocrinology and Metabolism
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Am J Physiol Cell Physiol 280: C1465-C1474, 2001;
0363-6143/01 $5.00
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Vol. 280, Issue 6, C1465-C1474, June 2001

Amino acid depletion activates TonEBP and sodium-coupled inositol transport

Renata Franchi-Gazzola1, Rossana Visigalli1, Valeria Dall'Asta1, Roberto Sala1, Seung Kyoon Woo2, H. Moo Kwon2, Gian C. Gazzola1, and Ovidio Bussolati1

1 Dipartimento di Medicina Sperimentale, Sezione di Patologia Generale e Clinica, Università degli Studi di Parma, 43100 Parma, Italy; and 2 Division of Nephrology, School of Medicine, The Johns Hopkins University, Baltimore, Maryland 21205

The expression of the osmosensitive sodium/myo-inositol cotransporter (SMIT) is regulated by multiple tonicity-responsive enhancers (TonEs) in the 5'-flanking region of the gene. In response to hypertonicity, the nuclear abundance of the transcription factor TonE-binding protein (TonEBP) is increased, and the transcription of the SMIT gene is induced. Transport system A for neutral amino acids, another osmosensitive mechanism, is progressively stimulated if amino acid substrates are not present in the extracellular compartment. Under this condition, as in hypertonicity, cells shrink and mitogen-activated protein kinases are activated. We demonstrate here that a clear-cut nuclear redistribution of TonEBP, followed by SMIT expression increase and inositol transport activation, is observed after incubation of cultured human fibroblasts in Earle's balanced salts (EBSS), an isotonic, amino acid-free saline. EBSS-induced SMIT stimulation is prevented by substrates of system A, although these compounds do not compete with inositol for transport through SMIT. We conclude that the incubation in isotonic, amino acid-free saline triggers an osmotic stimulus and elicits TonEBP-dependent responses like hypertonic treatment.

hypertonic stress; system A; glutamine; stress proteins; cell volume; tonicity-responsive enhancer-binding protein


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