Absence of α-calcitonin gene-related peptide modulates bone remodeling properties of murine osteoblasts and osteoclasts in an age-dependent way.

Abstract:

:Mice with an overall deletion of the sensory neuropeptide α-calcitonin gene-related peptide (α-CGRP) develop an age-dependent osteopenic bone phenotype. Underlying molecular mechanisms of how αCGRP affects bone cell metabolism are not well understood. This study aims to characterize differences in metabolic parameters of osteoblast-like cells (OB) and differentiated bone marrow-derived macrophages (BMM)/osteoclast (OC) cultures isolated from 3 month (3 m) and 9 month old (9 m) α-CGRP-deficient mice (-/-) and age-matched WT controls. All WT bone cell cultures endogenously produced and secreted α-CGRP. We found higher BMM but reduced OB numbers and reduced OB vitality after isolation from 9 m compared to 3 m mice, independent of genotype. Absence of α-CGRP reduced cell spreading, increased apoptosis rate throughout osteogenic differentiation, and reduced ALP activity during late osteogenic differentiation in 9 m OB-/- cultures, whereas minor effects were found in 3 m OB-/- cultures. Cathepsin K activity was reduced in 3 m OC-/- cultures. On the contrary, 9 m OC-/- cells demonstrated increased proliferation and caspase3/7 activity. The absence of α-CGRP influenced bone formation and resorption rate differently in bone cells from 3 and 9 m old mice. In summary we suggest, that an increase of dysfunctional mature osteoblasts might occur during aging and contribute to the development of the osteopenic bone phenotype in mature adult (9 m) α-CGRP-deficient mice.

journal_name

Mech Ageing Dev

authors

Niedermair T,Schirner S,Lasheras MG,Straub RH,Grässel S

doi

10.1016/j.mad.2020.111265

subject

Has Abstract

pub_date

2020-07-01 00:00:00

pages

111265

eissn

0047-6374

issn

1872-6216

pii

S0047-6374(20)30061-0

journal_volume

189

pub_type

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