Transcription Factor Hb9 Is Expressed in Glial Cell Lineages in the Developing Mouse Spinal Cord.

Autor:	Letchuman S; Department of Biology, Texas A&M University, College Station, TX 77843.; Mays Business School, Texas A&M University, College Station, TX 77843., Tucker A; Department of Biology, Texas A&M University, College Station, TX 77843.; Texas A&M Institute for Neuroscience, Texas A&M University, College Station, TX 77843., Miranda D; Department of Biology, Texas A&M University, College Station, TX 77843., Adkins RL; Department of Biology, Texas A&M University, College Station, TX 77843., Aceves M; Department of Biology, Texas A&M University, College Station, TX 77843.; Texas A&M Institute for Neuroscience, Texas A&M University, College Station, TX 77843., Dietz V; Department of Biology, Texas A&M University, College Station, TX 77843., Jagrit V; Department of Biology, Texas A&M University, College Station, TX 77843., Leonards A; Department of Biology, Texas A&M University, College Station, TX 77843., Lee YI; Department of Biology, Texas A&M University, College Station, TX 77843.; Department of Pharmacology and Therapeutics, University of Florida College of Medicine, Gainesville, FL 32610.; Myology Institute, University of Florida College of Medicine, Gainesville, FL 32610., Dulin JN; Department of Biology, Texas A&M University, College Station, TX 77843 jdulin@bio.tamu.edu.; Texas A&M Institute for Neuroscience, Texas A&M University, College Station, TX 77843.
Jazyk:	angličtina
Zdroj:	ENeuro [eNeuro] 2022 Nov 03; Vol. 9 (6). Date of Electronic Publication: 2022 Nov 03 (Print Publication: 2022).
DOI:	10.1523/ENEURO.0214-22.2022
Abstrakt:	Hb9 ( Mnx1 ) is a transcription factor described as a spinal cord motor neuron (MN)-specific marker and critical factor for the postmitotic specification of these cells. To date, expression of Hb9 in other cell types has not been reported. We performed a fate-mapping approach to examine distributions of Hb9-expressing cells and their progeny ("Hb9-lineage cells") within the embryonic and adult spinal cord of Hb9 cre ;Ai14 mice. We found that Hb9-lineage cells are distributed in a gradient of increasing abundance throughout the rostrocaudal spinal cord axis during embryonic and postnatal stages. Furthermore, although the majority of Hb9-lineage cells at cervical spinal cord levels are MNs, at more caudal levels, Hb9-lineage cells include small-diameter dorsal horn neurons, astrocytes, and oligodendrocytes. In the peripheral nervous system, we observed a similar phenomenon with more abundant Hb9-lineage Schwann cells in muscles of the lower body versus upper body muscles. We cultured spinal cord progenitors in vitro and found that gliogenesis was increased by treatment with the caudalizing factor FGF-8B, while glial tdTomato expression was increased by treatment with both FGF-8B and GDF-11. Together, these observations suggest that early and transient expression of Hb9 in spinal cord neural progenitors may be induced by caudalizing factors such as FGF and GDF signaling. Furthermore, our work raises the possibility that early Hb9 expression may influence the development of spinal cord macroglia and Schwann cells, especially at caudal regions. Together, these findings highlight the importance of using caution when designing experiments using Hb9 cre mice to perform spinal cord MN-specific manipulations. (Copyright © 2022 Letchuman et al.)
Databáze:	MEDLINE
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