Nemo‐Like Kinase Regulates Postnatal Skeletal Homeostasis
Open accessAbstract
Nemo-like kinase (Nlk) is related to the mitogen-activated protein (MAP) kinases and known to regulate signaling pathways involved in osteoblastogenesis. In vitro Nlk suppresses osteoblastogenesis, but the consequences of the Nlk inactivation in the skeleton in vivo are unknown. To study the function of Nlk, Nlk(loxP/loxP) mice, where the Nlk exon2 is flanked by lox(P) sequences, were mated with mice expressing the Cre recombinase under the control of the paired-related homeobox gene 1 (Prx1) enhancer (Prx1-Cre), the Osterix (Osx-Cre) or the osteocalcin/bone gamma carboxyglutamate protein (Bglap-Cre) promoter. Prx1-Cre;Nlk(Δ/Δ) mice did not exhibit a skeletal phenotype except for a modest increase in trabecular number and connectivity observed only in 3-month-old male mice. Osx-Cre;Nlk(Δ/Δ) male and female mice exhibited an increase in trabecular bone volume secondary to an increased trabecular number at 3 months of age. Bone histomorphometry revealed a decrease in osteoclast number and eroded surface in male mice, and decreased osteoblast number and function in female mice. Expression of osteoprotegerin mRNA was increased in calvarial extracts, explaining the decreased osteoclast and osteoblast number. The conditional deletion of Nlk in mature osteoblasts (Bglap-Cre;Nlk(Δ/Δ) ) resulted in no skeletal phenotype in 1- to 6-month-old male or female mice. In conclusion, when expressed in undifferentiated osteoblasts, Nlk is a negative regulator of skeletal homeostasis possibly by targeting signals that regulate osteoclastogenesis and bone resorption.
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NLK is not required for the function of mature osteoblasts.
“suggesting that NLK is not required for the function of mature osteoblasts [39].”
From Nemo-Like Kinase in Development and Diseases: Insights from Mouse Studies (2020) · cites this paper as [39]
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Cites
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“Recently, Nlk was found to play a critical role in the regulation of diverse signaling pathways, in particular theWnt/b-catenin, BMP/Smad and the Notch signaling pathways (Ishitani et al., 2003, 2010; Zeng et al., 2007).”
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Nemo-Like Kinase in Development and Diseases: Insights from Mouse Studies
Daams, R., & Massoumi, R. (2020) · International Journal of Molecular Sciences · doi:10.3390/ijms21239203 · Cited by 21 · see citing works
“The third model, which consists of a conditional deletion of NLK in mature osteoblasts, did not show any skeletal phenotype, suggesting that NLK is not required for the function of mature osteoblasts [39].”
Background
- Authors
- Canalis, E., Kranz, L., & Zanotti, S.
- Affiliations
- University of Connecticut (US)
- Saint Francis Hospital & Medical Center (US)
- Corresponding author
- Canalis, Ernesto
- Venue
- Journal of Cellular Physiology
- Publisher
- Wiley
- Published
- 2014-07-29
- Volume
- 229
- Issue
- 11
- Pages
- 1736-1743
- ISSN
- 0021-9541 (ISSN-L)
- 1097-4652
- PMC
- PMC4117815
- OpenAlex
- W1910428988
- Cited by
- 7
- References
- 2
- Citations by year
- 2025: 1 · 2021: 1 · 2020: 1 · 2019: 2 · 2018: 1 · 2017: 1
- FWCI
- 0.14
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Licence
- Locations
- Journal of Cellular Physiology (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR063049)
- National Institute of Diabetes and Digestive and Kidney Diseases (DK045227)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Alkaline Phosphatase Research Studies
- Keywords
- Nemo-like kinase, mitogen-activated protein kinase, skeletal homeostasis, osteoblastogenesis, osteoclastogenesis, bone resorption, trabecular bone, osteoprotegerin, conditional knockout mice, sex differences
- MeSH terms
- Sp7 Transcription Factor, Alleles, Animals, Animals, Newborn, Enzyme Activation, Female, Femur, Gene Expression Regulation, Homeostasis, Male, Mice, Inbred C57BL, Mice, Transgenic, Osteoblasts, RNA, Messenger, Skull, Transcription Factors, Protein Serine-Threonine Kinases, Gene Targeting, Muscle, Skeletal, Integrases, Mitogen-Activated Protein Kinases, Mice, Osteoprotegerin, RANK Ligand, X-Ray Microtomography
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