Abstract
Growth hormone (GH) has been implicated in a variety of brain functions, including neural development, cognition, and neuroprotection. The biological effects of GH are known to rely on the binding of GH to the GH receptor (GHR), yet the resulting signals in the brain remain poorly understood. The present study investigated the effects of hippocampal infusions of recombinant GH and a GHR antagonist on the expression of immediate early genes (IEGs) and behavioral responses in mice. The infusions induced differential expression of Arc, Nr4a1, and Npas4 mRNAs among the IEGs. The infusions also elicited differential behavioral responses, such as varied levels of spontaneous locomotion, self-grooming, and frequency of access to the corner fields in the open-field test. Polynomial regression analyses and canonical discriminant analyses between gene expression and behavioral changes demonstrated that the expression level of Arc mRNA was strongly correlated with locomotor activity level (r = 0.71 and 0.92 on days 8 and 10, respectively) and that the correlation was completely discriminable between drugs (error rate = 0 %). This analysis also revealed that a decrease in Npas4 mRNA was negatively correlated with the number of corner accesses (r = −0.63) and that this correlation was partially discriminable between drugs (error rate = 16.67 %). Taken together, these results suggest that the GH–GHR complex modulates Arc and Npas4 signaling, which affects spontaneous locomotor and exploratory behaviors.
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Abbreviations
- Arc :
-
Activity-regulated cytoskeletal-associated protein
- CNS:
-
Central nervous system
- Fos :
-
FBJ osteosarcoma oncogene
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- GH:
-
Growth hormone
- GHR:
-
Growth hormone receptor
- IEGs:
-
Immediate early genes
- Npas4 :
-
Neuronal PAS domain protein
- Nr4a1:
-
Nuclear receptor subfamily 4, group A, member 1
- qRT-PCR:
-
Quantitative real-time polymerase chain reaction
- rGH:
-
Human GH recombinant
- TLE:
-
Temporal lobe epilepsy
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Acknowledgments
This work was supported by grants from Kyoto Sangyo University Research Grants (E1106), the Ministry of Education, Culture, Sports, Science and Technology (17580260), and Core Research for Evolutional Science and Technology (CREST) of the Japan Science and Technology Agency (JST). The funding source had no role in study design/concept, data collection/analysis/interpretation, and manuscript preparation/submission. We appreciate Dr. Takeo Yoshikawa and Dr. Kazuyuki Yamada, Brain Science Institute, RIKEN, for their discussions regarding the manuscript, and Dr. Yoshiaki Nakayama and Dr. Akira Kurosaka for generously allowing us to use their dark-light box.
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Srimontri, P., Hirota, H., Kanno, H. et al. Infusion of growth hormone into the hippocampus induces molecular and behavioral responses in mice. Exp Brain Res 232, 2957–2966 (2014). https://doi.org/10.1007/s00221-014-3977-y
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DOI: https://doi.org/10.1007/s00221-014-3977-y