| Full text | |
| Author(s): |
Uchoa, Ernane Torres
[1, 2]
;
Marangon, Paula Beatriz
[1]
;
Rorato, Rodrigo
[1, 3]
;
Ruginsk, Silvia Graciela
[1, 4]
;
Debarba, Lucas Kniess
[1]
;
Antunes-Rodrigues, Jose
[1]
;
Elias, Lucila L. K.
[1]
Total Authors: 7
|
| Affiliation: | [1] Univ Sao Paulo, Sch Med Ribeirao Preto, Dept Physiol, Sao Paulo - Brazil
[2] Univ Estadual Londrina, Dept Physiol Sci, Londrina - Brazil
[3] Univ Ribeirao Preto, Biotechnol Unit, Ribeirao Preto - Brazil
[4] Univ Fed Alfenas, Biomed Sci Inst, Dept Physiol Sci, Alfenas - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Journal of Endocrinology; v. 242, n. 2, p. 125-138, AUG 2019. |
| Web of Science Citations: | 0 |
| Abstract | |
Adrenalectomy (ADX) induces hypophagia and glucocorticoids counter-regulate the peripheral metabolic effects of insulin. This study evaluated the effects of ADX on ICV (lateral ventricle) injection of insulin-induced changes on food intake, mRNA expression of hypothalamic neuropeptides (insulin receptor (InsR), proopiomelanocortin, cocaine and amphetamine-regulated transcript (Cart), agouti-related protein, neuropeptide Y (Npy) in the arcuate nucleus of the hypothalamus (ARC), corticotrophin-releasing factor in the paraventricular nucleus of the hypothalamus) and hypothalamic protein content of insulin signaling-related molecules (insulin receptor substrate (IRS) 1, protein kinase B (AKT), extracellular-signal-regulated kinase (ERK1/2), c-Jun N-terminal kinase (jNK), protein tyrosine phosphatase-1B (PTP1B) and T cell protein tyrosine phosphatase (TCPTP)) Compared with sham animals, ADX increased the hypothalamic content of pJNK/JNK, PTP1B and TCPTP, as well as decreased mRNA expression of InsR, and corticosterone (B) treatment reversed these effects. Insulin central injection enhanced hypothalamic content of pAKT/AKT and Cart mRNA expression, decreased Npy mRNA expression and food intake only in sham rats, without effects in ADX and ADX + B rats. Insulin did not alter the hypothalamic phosphorylation of IRS1 and ERK1/2 in the three experimental groups. These data demonstrate that ADX reduces the expression of InsR and increases insulin counter-regulators in the hypothalamus, as well as ADX abolishes hypophagia, activation of hypothalamic AKT pathway and changes in Cart and Npy mRNA expression in the ARC induced by insulin. Thus, the higher levels of insulin counter-regulatory proteins and lower expression of InsR in the hypothalamus are likely to underlie impaired insulininduced hypophagia and responses in the hypothalamus after ADX. (AU) | |
| FAPESP's process: | 13/09799-1 - Energy balance and body fluid homeostasis control: from cells to the physiological systems |
| Grantee: | José Antunes Rodrigues |
| Support Opportunities: | Research Projects - Thematic Grants |