Abstract
Hypoxia is a state in which the body or a specific part of the body is deprived of adequate oxygen supply at the tissue level. Sojourners involved in different activities at high altitudes (> 2500 m) face hypobaric hypoxia (HH) due to low oxygen in the atmosphere. HH is an example of generalized hypoxia, where the homeostasis of the entire body of an organism is affected and results in neurochemical changes. It is known that lower O2 levels affect catecholamines (CA), severely impairing cognitive and locomotor behavior. However, there is less evidence on the effect of HH-mediated alteration in brain Tetrahydrobiopterin (BH4) levels and its role in neurobehavioral impairments. Hence, this study aimed to shed light on the effect of acute HH on CA and BH4 levels with its neurobehavioral impact on Wistar rat models. After HH exposure, significant alteration of the CA levels in the discrete brain regions, viz., frontal cortex, hippocampus, midbrain, and cerebellum was observed. HH exposure significantly reduced spontaneous motor activity, motor coordination, and spatial memory. The present study suggests that the HH-induced behavioral changes might be related to the alteration of the expression pattern of CA and BH4-related genes and proteins in different rat brain regions. Overall, this study provides novel insights into the role of BH4 and CA in HH-induced neurobehavioral impairments.
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Abbreviations
- BH4:
-
Tetrahydrobiopterin
- CA:
-
Catecholamine
- CNS:
-
Central nervous system
- COMT:
-
Catechol-O-methyltransferase
- DA:
-
Dopamine
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- DBH:
-
Dopamine-β-hydroxylase
- DDC:
-
Aromatic l-amino acid decarboxylase
- DHFR:
-
Dihydrofolate reductase
- DTT:
-
Dithiothreitol
- GCH1:
-
GTP cyclohydrolase 1
- GTP:
-
Guanosine-5'-triphosphate
- HH:
-
Hypobaric hypoxia
- HIF-1α:
-
Hypoxia-inducible factor 1-alpha
- HPLC:
-
High-performance liquid chromatography
- HRP:
-
Horseradish peroxidase
- MAO:
-
Monoamine oxidase
- NE:
-
Norepinephrine
- NO:
-
Nitric oxide
- O2 :
-
Oxygen
- PD:
-
Parkinson’s disease
- PCBD1:
-
Pterin-4a-carbinolamine dehydratase 1
- PNMT:
-
Phenylethanolamine N-methyltransferase
- PTPS:
-
6-Pyruvoyltetrahydropterin synthase
- PVDF:
-
Polyvinylidene fluoride
- QDPR:
-
Quinoid dihydropteridine reductase
- SMA:
-
Spontaneous motor activity
- SPR:
-
Sepiapterin reductase
- TH:
-
Tyrosine hydroxylase
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Acknowledgements
We thank Dr. K. Kadirvelu, Director, DRDO-BU CLS and Dr. T. Anand, HOD NBT Division, DFRL, Mysore, for their support. The authors would like to acknowledge DST-SERB (EMR/2014/000600) for the vibratome facility. The authors would also like to thank Dr. K. Maharajan, Dr. M. Venkataramana, Dr. S. Thenmozhi, Dr. G. Vimal, Mr. K. V. Vignesh, Mr. M. Naika, Mr. S. Teja, Ms. U. Sathisaran, Ms. M. Tomy, Ms. A. Roonie, and Mr. D. Bhattacharjee for their valuable inputs. Authors would specially like to thank Mr. Sujoy Dey (Leica Microsystems, Bengaluru) for facilitating confocal microscopy imaging at Aravind Medical Research Foundation, Madurai, Tamil Nadu, India.
Funding
This work was supported by DRDO-BU Centre for Life Sciences and funded by the Ministry of Defence, New Delhi, India for financial support (DLS/86/50011/DRDO-BU Centre/Phase-II/2014).
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Funding acquisition and Supervision: EP; Conceptualization: MB and EP; Methodology: MB, SM and UMD; Formal analysis and investigation: EP and SM; Writing—original draft preparation: MB; Writing—review and editing: EP and SM; Resources: EP.
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All procedures followed the guidelines of the Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA) and animal ethical committee of Bharathiar University (Approval No: 722/Go/Re/S/02/CPCSEA), Coimbatore, India.
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Bhattacharjee, M., Manoharan, S., Deshetty, U.M. et al. Acute Hypobaric Hypoxia Exposure Causes Neurobehavioral Impairments in Rats: Role of Brain Catecholamines and Tetrahydrobiopterin Alterations. Neurochem Res 48, 471–486 (2023). https://doi.org/10.1007/s11064-022-03767-x
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DOI: https://doi.org/10.1007/s11064-022-03767-x