Characterization of Krt19 CreERT allele for targeting the nucleus pulposus cells in the postnatal mouse intervertebral disc.

Abstract:

:Intervertebral disc degeneration and associated back pain are relatively common but sparsely understood conditions, affecting over 70% of the population during some point of life. Disc degeneration is often associated with a loss of nucleus pulposus (NP) cells. Genetic mouse models offer convenient avenues to understand the cellular and molecular regulation of the disc during its formation, growth, maintenance, and aging. However, due to the lack of inducible driver lines to precisely target NP cells in the postnatal mouse disc, progress in this area of research has been moderate. NP cells are known to express cytokeratin 19 (Krt19), and tamoxifen (Tam)-inducible Krt19CreERT allele is available. The current study describes the characterization of Krt19CreERT allele to specifically and efficiently target NP cells in neonatal, skeletally mature, middle-aged, and aged mice using two independent fluorescent reporter lines. The efficiency of recombination at all ages was validated by immunostaining for KRT19. Results show that following Tam induction, Krt19CreERT specifically drives recombination of NP cells in the spine of neonatal and aged mice, while no recombination was detected in the surrounding tissues. Knee joints from skeletally mature Tam-treated Krt19CreERT/+ ; R26tdTOM mouse show the absence of recombination in all tissues and cells of the knee joint. Thus, this study provides evidence for the use of Krt19CreERT allele for genetic characterization of NP cells at different stages of the mouse life.

journal_name

J Cell Physiol

authors

Mohanty S,Pinelli R,Dahia CL

doi

10.1002/jcp.28952

subject

Has Abstract

pub_date

2020-01-01 00:00:00

pages

128-140

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

235

pub_type

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