Effects of postnatal bromocriptine injection on thyroid function and prolactinemia of rats at adulthood.
Previously, we demonstrated that maternal prolactin inhibition at the end of lactation, using bromocriptine (BRO), leads to an increase in leptin transfer via milk and induces the adult progeny to present hypothyroidism, leptin resistance and metabolic syndrome (obesity, hyperglycemia, hypertriglyceridemia, lower HDL). To test if these alterations are due to direct BRO action on the pups, in the present study we evaluated the long-term effects of direct injection of BRO (0.1μg/once daily) in male Wistar rats from postnatal (PN) day 1 to 10 (early treatment) or from PN11 to 20 (late treatment) on: food intake, body mass, cardiovascular parameters, hormone profile, hypothalamic leptin signaling, glucose homeostasis and thyroid hormone-dependent proteins. The respective controls were injected with methanol-saline. Offspring were killed at adulthood (PN180). Adult PN1-10 BRO-treated animals had lower food intake, hypoprolactinemia, lower leptin action (lower OBR-b, STAT-3 and SOCS-3 mRNA levels in the arcuate nucleus), lower TRH-TSH-thyroid axis as well as lower thyroid hormone markers. On the other hand, adult animals that were BRO-treated during the PN11-20 period showed hyperphagia, higher blood pressure, higher prolactinemia and OBR-b, higher TRH and plasma T3, hypercorticosteronemia as well as higher Dio2 and UCP1 mRNA expression in the brown adipose tissue. Glucose homeostasis was not changed treatment in either period. Our data show that early and late dopamine overexposure during lactation induces diverse metabolic disturbances later in life, increasing the risk of thyroid dysfunction and, consequently, changes in prolactinemia.
Laboratory of Endocrine Physiology, Roberto Alcantara Gomes Biology Institute, State University of Rio de Janeiro, Rio de Janeiro, RJ 20551-031, Brazil.
Janaine C
JC
Carvalho
Laboratory of Endocrine Physiology, Roberto Alcantara Gomes Biology Institute, State University of Rio de Janeiro, Rio de Janeiro, RJ 20551-031, Brazil. Electronic address: pclisboa@uerj.br.
Patricia C
PC
Lisboa
Laboratory of Endocrine Physiology, Roberto Alcantara Gomes Biology Institute, State University of Rio de Janeiro, Rio de Janeiro, RJ 20551-031, Brazil.
Elaine
E
de Oliveira
Laboratory of Endocrine Physiology, Roberto Alcantara Gomes Biology Institute, State University of Rio de Janeiro, Rio de Janeiro, RJ 20551-031, Brazil.
Nayara
N
Peixoto-Silva
Laboratory of Endocrine Physiology, Roberto Alcantara Gomes Biology Institute, State University of Rio de Janeiro, Rio de Janeiro, RJ 20551-031, Brazil.
Jessica L
JL
Nobre
Laboratory of Endocrine Physiology, Roberto Alcantara Gomes Biology Institute, State University of Rio de Janeiro, Rio de Janeiro, RJ 20551-031, Brazil.
Mabel C
MC
Fraga
Laboratory of Neurophysiology, Roberto Alcantara Gomes Biology Institute, State University of Rio de Janeiro, Rio de Janeiro, RJ 20551-031, Brazil.
Alex C
AC
Manhães
Laboratory of Endocrine Physiology, Roberto Alcantara Gomes Biology Institute, State University of Rio de Janeiro, Rio de Janeiro, RJ 20551-031, Brazil.
Egberto G
EG
Moura
D000818:Animals; D000831:Animals, Newborn; D001794:Blood Pressure / Q000187:drug effects; D001835:Body Weight / Q000187:drug effects; D001971:Bromocriptine / Q000494:pharmacology*; D004435:Eating / Q000187:drug effects; D006339:Heart Rate / Q000187:drug effects; D007031:Hypothalamus / Q000187:drug effects / Q000378:metabolism; D020738:Leptin / Q000378:metabolism; D008297:Male; D011388:Prolactin / Q000097:blood*; D051381:Rats; D017208:Rats, Wistar; D013961:Thyroid Gland / Q000187:drug effects* / Q000378:metabolism; D013963:Thyroid Hormones / Q000097:blood*
D020738:Leptin; D013963:Thyroid Hormones; D001971:Bromocriptine; D011388:Prolactin
Bromocriptine; Developmental plasticity; Hormones; Lactation; Prolactin; Rat; Thyroid