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Published on: November 20, 2015
Environmental impacts on the developing CNS: CD15, NCAM-L1, and GFAP expression in rat neonates exposed to
G M Sulkowski1, G-H Li, E M Sajdel-Sulkowska
1Harvard Medical School, Brigham and Women's Hospital, Boston, MA 02115, USA.
Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|April 6, 2005
Summary
Hypergravity exposure impacts developing rat cerebellum development, altering cerebellar mass and specific protein expression (CD15, NCAM-L1, GFAP) in a gender-specific manner, suggesting differing responses to gravity between males and females.
Area of Science:
- Developmental neuroscience
- Gravitational biology
- Molecular biology
Background:
- Previous studies show hypergravity affects developing rat cerebellum during critical growth periods.
- This response coincides with changes in thyroid hormone levels and impacts cell proliferation, migration, and glial development.
- Molecular mechanisms underlying cerebellar response to hypergravity remain largely uncharacterized.
Purpose of the Study:
- To investigate the molecular mechanisms of cerebellar response to hypergravity.
- Focus on expression changes of key cell-cell interaction proteins: CD15, NCAM-L1, and GFAP.
- Examine gender-specific differences in cerebellar response to hypergravity.
Main Methods:
- Rat neonates exposed to 1.5 G hypergravity from gestational day 11 to postnatal day 30.
- Cerebellar mass and protein expression analyzed at six time points (P6-P30) using quantitative western blots.
- Comparison between hypergravity (HG) and standard gravity (SC) groups, with analysis stratified by gender.
Main Results:
- Significant reduction in cerebellar mass observed, most pronounced in males on P6 and females on P9, with significant gender differences.
- Gender-specific, quantitative, and temporal changes in CD15, NCAM-L1, and GFAP protein expression correlated with cerebellar mass changes.
- Maximal CD15 decrease in HG females on P9; increased NCAM-L1 in HG males on P18; maximal GFAP decrease in HG males on P6.
Conclusions:
- Altered cerebellar protein expression under hypergravity likely contributes to structural and functional alterations in the central nervous system.
- Cerebellar development and its response to gravitational changes exhibit significant gender-specific differences.
- Findings highlight the complex interplay between gravity, development, and molecular signaling in the cerebellum.
