Adenovirus-mediated suppression of hypothalamic glucokinase affects feeding behavior.

Abstract:

:Glucokinase (GK), the hexokinase involved in glucosensing in pancreatic β-cells, is also expressed in arcuate nucleus (AN) neurons and hypothalamic tanycytes, the cells that surround the basal third ventricle (3V). Several lines of evidence suggest that tanycytes may be involved in the regulation of energy homeostasis. Tanycytes have extended cell processes that contact the feeding-regulating neurons in the AN, particularly, agouti-related protein (AgRP), neuropeptide Y (NPY), cocaine- and amphetamine-regulated transcript (CART) and proopiomelanocortin (POMC) neurons. In this study, we developed an adenovirus expressing GK shRNA to inhibit GK expression in vivo. When injected into the 3V of rats, this adenovirus preferentially transduced tanycytes. qRT-PCR and Western blot assays confirmed GK mRNA and protein levels were lower in GK knockdown animals compared to the controls. In response to an intracerebroventricular glucose injection, the mRNA levels of anorexigenic POMC and CART and orexigenic AgRP and NPY neuropeptides were altered in GK knockdown animals. Similarly, food intake, meal duration, frequency of eating events and the cumulative eating time were increased, whereas the intervals between meals were decreased in GK knockdown rats, suggesting a decrease in satiety. Thus, GK expression in the ventricular cells appears to play an important role in feeding behavior.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Uranga RM,Millán C,Barahona MJ,Recabal A,Salgado M,Martinez F,Ordenes P,Elizondo-Vega R,Sepúlveda F,Uribe E,García-Robles MLÁ

doi

10.1038/s41598-017-03928-x

subject

Has Abstract

pub_date

2017-06-16 00:00:00

pages

3697

issue

1

issn

2045-2322

pii

10.1038/s41598-017-03928-x

journal_volume

7

pub_type

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