Assimilation of LDL by experimental tumours in mice

P. Lombardi, G. Norata, F. M. Maggi, G. Canti, P. Franco, A. Nicolin, A. L. Catapano

Research output: Contribution to journalArticlepeer-review

Abstract

We have studied the uptake of 125I-labelled low-density lipoprotein (LDL) by seven experimental murine tumours in vivo. Four tumours (Lewis Lung carcinoma, B-16, MS-2 and Colon 26) showed a higher relative uptake of lipoprotein as compared to the liver, two (L-1210 and P-388) had a very low lipoprotein uptake, while lipoprotein uptake by tumour M5 was similar to that of the liver. The data was confirmed by tracing tissue uptake of lipoproteins using [14C]sucrose-labeled LDL. These in vivo findings correlated well with the in vitro specific binding of 125I-β-VLDL to membranes prepared from tumours, thus suggesting that the expression of the LDL receptor in the tumours is related to the in vivo uptake of lipoprotein. Further analysis of the LDL receptor by ligand blotting showed that the tumor receptor has several of the liver LDL receptor characteristics (including apparent Mr, sensitivity to proteinases, and Ca2+ requirement for lipoprotein binding). In summary, our data show that experimental murine tumours express the LDL receptor and suggest that the high relative in vivo uptake of LDL is determined by the elevated LDL-receptor expression in the tumours.

Original languageEnglish
Pages (from-to)301-306
Number of pages6
JournalBiochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism
Volume1003
Issue number3
DOIs
Publication statusPublished - Jun 28 1989

Keywords

  • (Mouse)
  • LDL
  • LDL receptor
  • Lipoprotein
  • Lipoprotein transport
  • Tumor

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Endocrinology

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