Motor neurons with limb-innervating character in the cervical spinal cord are sculpted by apoptosis based on the Hox code in chick embryo
| Autor: | Chie Sakuma, Keiji Nishiyama, Hiroyuki Yaginuma, Noboru Sato, Takako Shimada, Tomoaki Okada, Shunsaku Homma, Katsuki Mukaigasa |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Population Apoptosis Chick Embryo Biology Cell Line Avian Proteins 03 medical and health sciences 0302 clinical medicine medicine Animals Humans RNA Small Interfering education Hox gene Molecular Biology Homeodomain Proteins Motor Neurons education.field_of_study Gene knockdown Cervical Cord Gene Expression Regulation Developmental Embryo Cell Differentiation Forkhead Transcription Factors Anatomy Motor neuron Spinal cord Embryonic stem cell Cell biology 030104 developmental biology medicine.anatomical_structure Ectopic expression RNA Interference 030217 neurology & neurosurgery Developmental Biology |
| Zdroj: | Development (Cambridge, England). 144(24) |
| ISSN: | 1477-9129 |
| Popis: | In the developing chick embryo, a certain population of motor neurons (MNs) in the non-limb-innervating cervical spinal cord undergoes apoptosis between embryonic days 4 and 5. However, the characteristics of these apoptotic MNs remain undefined. Here, by examining the spatiotemporal profiles of apoptosis and MN subtype marker expression in normal or apoptosis-inhibited chick embryos, we found that this apoptotic population is distinguishable by Foxp1 expression. When apoptosis was inhibited, the survived Foxp1+ MNs showed characteristics of lateral motor column (LMC) neurons, which are of a limb-innervating subtype, suggesting that cervical Foxp1+ MNs are the rostral continuation of LMC. Knock-down and misexpression of Foxp1 did not affect apoptosis progression, but revealed the role of Foxp1 in conferring LMC identity on the cervical MNs. Furthermore, ectopic expression of Hox genes that are normally expressed in the brachial region prevented apoptosis, and directed Foxp1+ MNs to LMC neurons at the cervical level. These results indicate that apoptosis in the cervical spinal cord plays a role in sculpting Foxp1+ MNs committed to LMC neurons, depending on the Hox expression pattern. |
| Databáze: | OpenAIRE |
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