Abstract
Activity of the hypothalamic–pituitary–thyroid (HPT) axis is controlled by the brain neurotransmitter systems, including the melanocortin signaling system. Pharmacological inhibition of type 4 melanocortin receptors (M4R) leads to disruption of the HPT axis function and reduction in the level of thyroid hormones. At the same time, the data on how a prolonged M4R inhibition affects this axis and on the role of these receptors in regulation of this axis are absent. The relationship between thyroid status and the activity of 1B-subtype 5-hydroxytryptamine receptor (5-HT1BR) is scarcely explored. The aim of this work was to study the effects of chronic M3R, M4R and 5-HT1BR inhibition induced by immunization of rats with BSA-conjugated peptides derived from the extracellular regions of these receptors on thyroid status and the activity of thyroid stimulating hormone (TSH)-sensitive adenylyl cyclase signaling system (ACSS) in the thyroid gland (TG) of immunized animals. In rats immunized with peptides K-[TSLHLWNRSSHGLHG11–25]-A (M4R), A-[PTNPYCICTTAH269–280]-A (M3R) and [QAKAEEEVSEC(Acm)-VVNTDH189–205]-A (5-HT1BR), the levels of thyroid hormones, such as fT4, tT4 and tT3, were significantly reduced. In rats immunized with M4R and M3R peptides, the TSH level increased, while in animals immunized with 5-HT1BR peptide, on the contrary, it was reduced. In the TG of rats immunized with M4R and M3R peptides, the stimulatory effects of hormones (TSH, PACAP-38) and GppNHp on the adenylyl cyclase activity were attenuated, and changes were most pronounced for M4R peptide immunization. After immunization with 5-HT1BR peptide, the stimulatory effects of TSH, PACAP-38 and GppNHp persisted. Thus, the main cause of thyroid hormone deficiency in rats immunized with M4R and M3R peptides was the decreased sensitivity of thyrocitic ACSS to TSH, whereas in rats immunized with 5-HT1BR peptide thyroid hormone deficiency was due to the decreased level of TSH. Our data on the negative impact of long-term immunization of rats with BSA-conjugated peptides derived from the extracellular regions of M4R, M3R and 5-HT1BR on their thyroid status provide a strong argument in favor of the involvement of these receptors and receptor-coupled intracellular signaling pathways in the regulation of the HPT axis.
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Abbreviations
- te]ALP:
-
Agouti-like peptide
- AC:
-
adenylyl cyclase
- ACSS:
-
adenylyl cyclase signaling system
- BSA:
-
bovine serum albumin
- HPT axis:
-
hypothalamic–pituitary–thyroid axis
- M3R and M4R:
-
type 3 and 4 melanocortin receptors
- α-MSH and γ-MSH:
-
α- and γ-melanocytestimulating hormones
- TSH:
-
thyroid stimulating hormone
- TFAA:
-
trifluoroacetic acid
- TG:
-
thyroid gland
- fT4 :
-
free thyroxine
- tT4 :
-
total thyroxine
- tT3 :
-
total triiodothyronine
- HOMA-IR:
-
homeostasis model assessment-insulin resistance
- PACAP-38:
-
pituitary adenylyl cyclase-activating polypeptide-38
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Original Russian Text © K.V. Derkach, I.V. Moiseyuk, E.A. Shpakova, A.O. Shpakov, 2015, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2015, Vol. 51, No. 4, pp. 243—250.
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Derkach, K.V., Moiseyuk, I.V., Shpakova, E.A. et al. The thyroid status of rats immunized with peptides derived from the extracellular regions of the types 3 and 4 melanocortin receptors and the 1B-subtype 5-hydroxytryptamine receptor. J Evol Biochem Phys 51, 279–287 (2015). https://doi.org/10.1134/S0022093015040031
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DOI: https://doi.org/10.1134/S0022093015040031