Fingolimod phosphate inhibits astrocyte inflammatory activity in mucolipidosis IV.

Abstract:

:Mucolipidosis IV (MLIV) is an orphan neurodevelopmental disease that causes severe neurologic dysfunction and loss of vision. Currently there is no therapy for MLIV. It is caused by loss of function of the lysosomal channel mucolipin-1, also known as TRPML1. Knockout of the Mcoln1 gene in a mouse model mirrors clinical and neuropathologic signs in humans. Using this model, we previously observed robust activation of microglia and astrocytes in early symptomatic stages of disease. Here we investigate the consequence of mucolipin-1 loss on astrocyte inflammatory activation in vivo and in vitro and apply a pharmacologic approach to restore Mcoln1-/- astrocyte homeostasis using a clinically approved immunomodulator, fingolimod. We found that Mcoln1-/- mice over-express numerous pro-inflammatory cytokines, some of which were also over-expressed in astrocyte cultures. Changes in the cytokine profile in Mcoln1-/- astrocytes are concomitant with changes in phospho-protein signaling, including activation of PI3K/Akt and MAPK pathways. Fingolimod promotes cytokine homeostasis, down-regulates signaling within the PI3K/Akt and MAPK pathways and restores the lysosomal compartment in Mcoln1-/- astrocytes. These data suggest that fingolimod is a promising candidate for preclinical evaluation in our MLIV mouse model, which, in case of success, can be rapidly translated into clinical trial.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Weinstock LD,Furness AM,Herron SS,Smith SS,Sankar SB,DeRosa SG,Gao D,Mepyans ME,Scotto Rosato A,Medina DL,Vardi A,Ferreira NS,Cho SM,Futerman AH,Slaugenhaupt SA,Wood LB,Grishchuk Y

doi

10.1093/hmg/ddy182

subject

Has Abstract

pub_date

2018-08-01 00:00:00

pages

2725-2738

issue

15

eissn

0964-6906

issn

1460-2083

pii

4996739

journal_volume

27

pub_type

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