Redox-Dependent Bone Alkaline Phosphatase Dysfunction Drives Part of the Complex Bone Phenotype in Mice Deficient for Memo1

Moor, Matthias B; Ramakrishnan, Suresh K; Legrand, Finola; Dolder, Silvia; Siegrist, Mark; Durussel, Fanny; Centeno, Gabriel; Firsov, Dmitri; Hynes, Nancy E; Hofstetter, Wilhelm; Bonny, Olivier (2018). Redox-Dependent Bone Alkaline Phosphatase Dysfunction Drives Part of the Complex Bone Phenotype in Mice Deficient for Memo1. JBMR plus, 2(4), pp. 195-205. Wiley 10.1002/jbm4.10034

[img] Text
JBM4-2-195.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (1MB) | Request a copy

Mediator of ErbB2-driven cell Motility 1 (MEMO1) is an intracellular redox protein that integrates growth factors signaling with the intracellular redox state. We have previously reported that mice lacking displayed higher plasma calcium levels and other alterations of mineral metabolism, but the underlying mechanism was unresolved and the bone phenotype was not described. Here, we show that Cre/lox-mediated MEMO1 deletion in the whole body of C57Bl/6 mice (Memo cKO) leads to severely altered trabecular bone and lower mineralization, with preserved osteoblast and osteoclast number and activity, but altered osteoblast response to epidermal growth factor (EGF) and FGF2. More strikingly, Memo cKO mice display decreased alkaline phosphatase (ALP) activity in serum and in bone, while expression level is unchanged. Bone intracellular redox state is significantly altered in Memo cKO mice and we inferred that ALP dimerization was reduced in Memo cKO mice. Indeed, despite similar ALP oxidation, we found increased ALP sensitivity to detergent in Memo cKO bone leading to lower ALP dimerization capability. Thus, we report a severe bone phenotype and dysfunctional bone ALP with local alteration of the redox state in Memo cKO mice that partially mimics hypophosphatasia, independent of mutations. These findings reveal Memo as a key player in bone homeostasis and underline a role of bone redox state in controlling ALP activity.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR)
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DBMR Forschung Mu35 > Forschungsgruppe Knochenbiologie & Orthopädische Forschung
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DBMR Forschung Mu35 > Forschungsgruppe Knochenbiologie & Orthopädische Forschung

UniBE Contributor:

Dolder, Silvia; Siegrist, Mark and Hofstetter, Wilhelm

Subjects:

600 Technology > 610 Medicine & health

ISSN:

2473-4039

Publisher:

Wiley

Language:

English

Submitter:

Marla Rittiner

Date Deposited:

23 Jan 2019 15:24

Last Modified:

28 Jan 2019 15:41

Publisher DOI:

10.1002/jbm4.10034

PubMed ID:

30038965

Uncontrolled Keywords:

Alkaline phosphatase Hypophosphatasia MEMO1 Redox

BORIS DOI:

10.7892/boris.122555

URI:

https://boris.unibe.ch/id/eprint/122555

Actions (login required)

Edit item Edit item
Provide Feedback