Abstract
Purpose
Cold exposure activates the hypothalamus–pituitary–thyroid (HPT) axis, response blunted by previous acute stress or corticosterone administration. Chronic stressors can decrease serum T3 concentration, and thyrotropin-releasing hormone (Trh) expression in the paraventricular nucleus (PVN), but impact on the response to cold is unknown; this was studied in rats submitted to daily repeated restraint (rRes) that causes habituation of hypothalamus–pituitary–adrenal (HPA) axis response, or to chronic variable stress (CVS) that causes sensitization and hyperreactivity.
Methods
Wistar male adult rats were submitted to rRes 30 min/day, or to CVS twice a day, for 15 days. On day 16, rats were exposed 1 h to either 5 or 21 °C. Parameters of HPT and HPA axes activity and of brown adipose tissue (BAT) cold response were measured; gene expression in PVN and BAT, by RT-PCR; serum hormone concentration by radioimmunoassay or ELISA.
Results
Compared to naïve animals, Crh and corticosterone concentrations were attenuated at the end of rRes, but increased at the end of CVS treatments. Cold exposure increased mRNA levels of Crh, Trh, and serum concentration of thyrotropin in naïve, but not in rRes or CVS rats; corticosterone increased in all groups. Cold induced expression of thermogenic genes in BAT (Dio2 and Ucp1) in naïve but not in stressed rats; Adrb3 expression was differentially regulated.
Conclusion
Both types of chronic stress blunted HPT and BAT responses to cold. Long-term stress effects on noradrenergic and/or hormonal signaling are likely responsible for HPT dysfunction and not the type of chronic stressor.
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Abbreviations
- ACTH:
-
Adrenocorticotropin
- Adrb3 :
-
β3 Adrenergic receptor gene
- BAT:
-
Brown adipose tissue
- BWg:
-
Body weight gain
- cAMP:
-
Cyclic adenosine monophosphate
- Cort:
-
Corticosterone
- Cpf:
-
Control pair-fed
- Crh :
-
Corticotropin-releasing hormone gene
- CRH:
-
Corticotropin-releasing hormone peptide
- CVS:
-
Chronic variable stress
- Dio2 :
-
Deiodinase 2 gene
- DIO2:
-
Deiodinase 2
- EPM:
-
Elevated plus maze
- Gr:
-
Glucocorticoid receptor gene (Nr3c1: nuclear receptor subfamily 3 group C member gene)
- HPA:
-
Hypothalamus–pituitary–adrenal axis
- HPT:
-
Hypothalamus–pituitary–thyroid axis
- N:
-
Naïve
- OFT:
-
Open field test
- pCREB:
-
Phosphorylated cAMP response element-binding protein
- PKA:
-
Protein kinase A
- PKAc:
-
Catalytic subunit of PKA
- PVN:
-
Paraventricular nucleus of the hypothalamus
- rRes:
-
Repeated restraint stress
- RT:
-
Room temperature
- RT-PCR:
-
Reverse transcription polymerase chain reaction
- SAS:
-
Sympathoadrenal system
- T3:
-
3, 3′, 5-Triiodo-l-thyronine
- T4:
-
Thyroxine
- Trh :
-
Thyrotropin-releasing hormone gene
- TRH:
-
Thyrotropin-releasing hormone peptide
- TSH:
-
Thyrotropin
- Ucp1 :
-
Uncoupling protein 1 gene
- UCP-1:
-
Uncoupling protein 1
- WAT:
-
White adipose tissue
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Acknowledgements
The authors acknowledge the technical assistance of M. Gutiérrez-Mariscal, M. Cisneros, F. Romero, R. Rodríguez Bahena, S. Ainsworth and E. López Bustos.
Funding
The present study was supported by UNAM-DGAPA (Grant no. IN213419), CONACYT (Schollarships for graduate studies), CONACYT (Grant no. 284883).
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Maintenance and work with animals followed the Guide for the care and use of laboratory animals (8th ed.), as well as the Mexican norm NOM-062-ZOO-1999. These experiments were approved by the Bioethics Committee of the Institute, approval No. 273 and 318.
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Castillo-Campos, A., Gutiérrez-Mata, A., Charli, JL. et al. Chronic stress inhibits hypothalamus–pituitary–thyroid axis and brown adipose tissue responses to acute cold exposure in male rats. J Endocrinol Invest 44, 713–723 (2021). https://doi.org/10.1007/s40618-020-01328-z
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DOI: https://doi.org/10.1007/s40618-020-01328-z