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Insulinotropic treatments exacerbate metabolic syndrome in mice lacking MeCP2 function.

Abstract：

:Rett syndrome (RTT), an X-linked postnatal disorder, results from mutations in Methyl CpG-binding protein 2 (MECP2). Survival and breathing in Mecp2(NULL/Y) animals are improved by an N-terminal tripeptide of insulin-like growth factor I (IGF-I) treatment. We determined that Mecp2(NULL/Y) animals also have a metabolic syndrome and investigated whether IGF-I treatment might improve this phenotype. Mecp2(NULL/Y) mice were treated with a full-length IGF-I modified with the addition of polyethylene glycol (PEG-IGF-I), which improves pharmacological properties. Low-dose PEG-IGF-I treatment slightly improved lifespan and heart rate in Mecp2(NULL/Y) mice; however, high-dose PEG-IGF-I decreased lifespan. To determine whether insulinotropic off-target effects of PEG-IGF-I caused the detrimental effect, we treated Mecp2(NULL/Y) mice with insulin, which also decreased lifespan. Thus, the clinical benefit of IGF-I treatment in RTT may critically depend on the dose used, and caution should be taken when initiating clinical trials with these compounds because the beneficial therapeutic window is narrow.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Pitcher MR,Ward CS,Arvide EM,Chapleau CA,Pozzo-Miller L,Hoeflich A,Sivaramakrishnan M,Saenger S,Metzger F,Neul JL

doi

10.1093/hmg/ddt111

subject

Has Abstract

pub_date

2013-07-01 00:00:00

pages

2626-33

issue

13

eissn

0964-6906

issn

1460-2083

pii

ddt111

journal_volume

22

pub_type

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