eCite Digital Repository

Western style diet impairs entrance of blood-borne insulin-like growth factor-1 into the brain


Dietrich, MO and Muller, A and Bolos, M and Carro, E and Perry, ML and Portela, LV and Souza, DO and Torres-Aleman, I, Western style diet impairs entrance of blood-borne insulin-like growth factor-1 into the brain, Neuromolecular Medicine, 9, (4) pp. 324-330. ISSN 1535-1084 (2007) [Refereed Article]

DOI: doi:10.1007/s12017-007-8011-0


It is increasingly recognized that life-style factors, such as physical exercise or diet influence brain health. In the present work we analyzed the effect of a western-style diet ("cafeteria diet") on the entrance to the brain of circulating IGF-1, a neuroprotective agent that has been related to different neurodegenerative diseases. Rats under a cafeteria diet showed reduced passage of systemic IGF-1 across the choroid plexus, a main site of IGF-1 entrance into the brain through the cerebrospinal fluid. Furthermore, the IGF-1 receptor at the choroid plexus of rats fed with a cafeteria diet showed enhanced sensitivity toward IGF-1 while receptor levels remained unchanged. Examination of possible mechanisms underlying reduced entrance of systemic IGF-1 to the brain showed that triglycerides that increased in blood after a cafeteria diet, diminished the passage of IGF-1 across choroid plexus epithelia. This effect of triglycerides was achieved by altering the interaction of IGF-1 with megalin, a choroid plexus transporter involved in transcytosis of IGF-1 from the circulation into the brain. Reduced brain entrance of circulating IGF-1 elicited by a western-style diet suggests that the higher incidence of brain diseases related to inadequate diets is due in part to diminished neurotrophic support.

Item Details

Item Type:Refereed Article
Research Division:Biomedical and Clinical Sciences
Research Group:Neurosciences
Research Field:Cellular nervous system
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Bolos, M (Dr Marta Bolos Jurado)
ID Code:87499
Year Published:2007
Web of Science® Times Cited:23
Deposited By:Menzies Institute for Medical Research
Deposited On:2013-11-20
Last Modified:2013-11-20

Repository Staff Only: item control page