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Askvig JM, Irmen RE, Dalzell TS, Whiteman ST, Andersen MJ, Said Z, Nguyen DQ, Bexell SH, Maruska BL. Axotomy results in an increase in Thy-1 protein in the 35-day-old rat supraoptic nucleus. Exp Brain Res 2023; 241:851-864. [PMID: 36757564 DOI: 10.1007/s00221-023-06562-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 01/19/2023] [Indexed: 02/10/2023]
Abstract
We demonstrated previously that the hypothalamic supraoptic nucleus (SON) undergoes an axonal sprouting response following a unilateral lesion of the hypothalamo-neurohypophysial tract in a 35-day-old rat to repopulate the partially denervated neural lobe (NL). However, no sprouting occurs following the same injury in a 125-day-old rat. We previously reported a significant increase in Thy-1 protein in the SON of a 125-day-old rat compared to a 35-day-old rat in the absence of injury. Thy-1 is a cell surface glycoprotein shown to inhibit axonal outgrowth following injury; however, we did not look at axotomy's effect on Thy-1 in the SON. Therefore, we sought to determine the integrin ligands that bind Thy-1 in the SON and how axotomy impacts Thy-1. Like what others have shown, the co-immunoprecipitation analysis demonstrated that Thy-1 interacts with αvß3 and αvß5 integrin dimers in the SON. We used western blot analysis to examine protein levels of Thy-1 and integrin subunits following injury in the 35- and 125-day-old rat SON and NL. Our results demonstrated that Thy-1 protein levels increase in the lesion SON in a 35-day-old rat. The quantitative dual-fluorescent analysis showed that the increase in Thy-1 in the lesion SON occurred in astrocytes. There was no change in Thy-1 or integrin protein levels following injury in the 125-day-old following injury. Furthermore, the axotomy significantly decreased Thy-1 protein levels in the NL of both 35- and 125-day-old rats. These results provide evidence that Thy-1 protein levels are injury dependent in the magnocellular neurosecretory system.
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Affiliation(s)
- Jason M Askvig
- Department of Biology and Neuroscience Program, Concordia College, Jason Askvig, 901 S 8th St, Moorhead, MN, 56562, USA.
| | - Riley E Irmen
- Department of Biology and Neuroscience Program, Concordia College, Jason Askvig, 901 S 8th St, Moorhead, MN, 56562, USA
| | - Talia S Dalzell
- Department of Biology and Neuroscience Program, Concordia College, Jason Askvig, 901 S 8th St, Moorhead, MN, 56562, USA
| | - Sara T Whiteman
- Department of Biology and Neuroscience Program, Concordia College, Jason Askvig, 901 S 8th St, Moorhead, MN, 56562, USA
| | - Marissa J Andersen
- Department of Biology and Neuroscience Program, Concordia College, Jason Askvig, 901 S 8th St, Moorhead, MN, 56562, USA
| | - Zaynab Said
- Department of Biology and Neuroscience Program, Concordia College, Jason Askvig, 901 S 8th St, Moorhead, MN, 56562, USA
| | - Duong Q Nguyen
- Department of Biology and Neuroscience Program, Concordia College, Jason Askvig, 901 S 8th St, Moorhead, MN, 56562, USA
| | - Sydney H Bexell
- Department of Biology and Neuroscience Program, Concordia College, Jason Askvig, 901 S 8th St, Moorhead, MN, 56562, USA
| | - Brooke L Maruska
- Department of Biology and Neuroscience Program, Concordia College, Jason Askvig, 901 S 8th St, Moorhead, MN, 56562, USA
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Whiteman ST, Askvig JM. Astrocytic role of Thy-1 induced inhibition of axonal sprouting. Neural Regen Res 2021; 16:1192-1193. [PMID: 33269771 PMCID: PMC8224143 DOI: 10.4103/1673-5374.300429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
| | - Jason M Askvig
- Department of Biology, Concordia College, Moorhead, MN, USA
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