Abstract:
:Cathepsin K deficiency in male mice (Ctsk-/-) results in decreased numbers of hippocampal astrocytes and altered neuronal patterning as well as learning and memory deficits. Additionally, cathepsin K carries essential roles in the thyroid gland where it contributes to the liberation of thyroid hormones (TH). Because TH are essential for brain development, in particular for the cerebellum, we investigated whether cathepsin K's function in the thyroid is directly linked to the brain phenotype of Ctsk-/- mice. Serum levels of thyroid stimulating hormone, brain concentrations of free TH, and deiodinase 2 (Dio2) activity in brain parenchyma as well as cerebellar development were comparable in Ctsk-/- and WT animals, suggesting regular thyroid states and TH metabolism. Despite unaltered transcript levels, protein expression of two TH transporters was enhanced in specific brain regions in Ctsk-/- mice, suggesting altered TH supply to these regions. Thyrotropin releasing hormone (Trh) mRNA levels were enhanced threefold in the hippocampus of Ctsk-/- mice. In the striatum of Ctsk-/- mice the mRNA for Dio2 and hairless were approximately 1.3-fold enhanced, while mRNA levels for monocarboxylate transporter 8 and Trh were reduced to 60% and 40%, respectively, pointing to altered striatal physiology. We conclude that the role of cathepsin K in the thyroid gland is not directly associated with its function in the central nervous system (CNS) of mice. Future studies will show whether the brain region-specific alterations in Trh mRNA may eventually result in altered neuroprotection that could explain the neurobehavioral defects of Ctsk-/- mice.
journal_name
Cell Mol Neurobioljournal_title
Cellular and molecular neurobiologyauthors
Dauth S,Rakov H,Sîrbulescu RF,Ilieş I,Weber J,Batbajar Dugershaw B,Braun D,Rehders M,Wirth EK,Führer D,Schweizer U,Brix Kdoi
10.1007/s10571-019-00765-6subject
Has Abstractpub_date
2020-07-01 00:00:00pages
695-710issue
5eissn
0272-4340issn
1573-6830pii
10.1007/s10571-019-00765-6journal_volume
40pub_type
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