Restriction of tumor growth in mice by sodium-deficient diet.

Published

Journal Article

Generalized malnutrition results in inhibition of tumorigenesis and tumor growth in experimental animal models. Neither the specific nutrient deficiency nor the mechanism has been definitely elucidated. We have shown previously that dietary sodium deprivation in rapidly growing rats retards protoplasmic growth. This effect was correlated to the extracellular fluid (ECF) volume expansion which is dependent on sodium accumulation. Since solid tumors are composed of a large quantity of ECF (which includes plasma volume) it was postulated that preventing the accumulation of new ECF by means of sodium restriction would influence tumor growth. The present study was designed to determine the effects of salt restriction on tumor growth and to relate these effects to ECF volume. Approximately 10(6) viable B16 melanoma cells were injected into C57BL/6 x DBA/2 F1 and C57 mice. A salt restricted diet (sodium less than 3 microeq/g) was provided ad libitum. The drinking solution was distilled water for the experimental group and 0.45% saline solution for the controls. There was a significant decrease in tumor growth rates during sodium restriction. The total body ECF volume increased when dietary sodium was supplied but did not change during salt restriction. Therefore, the only source for the ECF in the tumor mass was from nontumorous tissue. We conclude that during dietary sodium restriction solid tumor growth is retarded and can proceed only to the extent that ECF is released from cachectic body tissues.

Full Text

Duke Authors

Cited Authors

  • Fine, BP; Ponzio, NM; Denny, TN; Maher, E; Walters, TR

Published Date

  • June 15, 1988

Published In

Volume / Issue

  • 48 / 12

Start / End Page

  • 3445 - 3448

PubMed ID

  • 3370641

Pubmed Central ID

  • 3370641

International Standard Serial Number (ISSN)

  • 0008-5472

Language

  • eng

Conference Location

  • United States