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Tipo:	Artigo de Periódico
Título:	SUN-023 changes in microct bone density and reduced bone formation in a “postmenopausal” PCOS rat model
Autor(es):	Fabio Vasconcellos Comim Rafael Moresco Melissa Orlandin Premaor Lady Katerine Mujica Soraia Macari Tarcília Aparecida Silva Breno Rocha Barrioni Carolina Stein Fernanda Valente Ligia Miyazato Alfredo Antoniazzi
Resumo:	Polycystic ovary syndrome (PCOS) affects women during their entire lifespan. Evidence from the literature suggests an association of PCOS with decreased bone formation markers (osteocalcin and P1NP), although no conclusive data about the incidence of fractures exist. In the present study, we investigated the consequences of androgenization in rats on bone markers and femur microCT and the changes in these parameters after ovariectomy. This study was approved by the local Animal Ethics Committee. Briefly, Wistar rats (n= 38) were divided in 4 groups: 1) “Control OVX” (single dose of corn oil s.c. at day 5 of life and ovariectomy at day 100, n=9); 2) “Control SHAM” (n=9); 3) “Androgenized OVX”(single dose of testosterone propionate 1.25 mg s.c. at day 5 of life and ovariectomy at day 100, n=10); and 4) “Androgenized SHAM” (n=10). Full characterization of estrous cycles and weight was performed during growth, and all animals were euthanized at day 180 during metestrus/diestrous. Evaluation of glucose levels, lipids, estradiol, P1NP levels (a marker of bone formation), and analysis of the femur micro CT Skyscan 1174 (Aartselaar, Belgium) was performed in at least eight animals of each group. Ovariectomy increased the weight of Androgenized OVX rats on day 180: these animals were heavier than Control OVX, Control SHAM, or Androgenized SHAM (ANOVA p<0.001). However, metabolic changes were observed in ovary-intact Androgenized SHAM rats who exhibited higher total cholesterol (ANOVA p<0.001), increased LDL (ANOVA p=0.03), and elevated TyG index, a marker of insulin resistance (ANOVA p<0.001) against all other three groups. This group (Androgenized SHAM rats)also exhibited an increase in MicroCt bone density (g/cm-3) (mean + SEM) of 1.117 + 0.06 against the other - Control SHAM 0.8433 + 0.03, Control OVX 0.5527 + 0.001, and Androgenized OVX 0.6284 + 0.02 (ANOVA p< 0.001). Although the values of bone density between Control OVX and Androgenized OVX groups were similar, gonadal removal produced a different pattern of bone density reduction between Control OVX and Androgenized OVX (Two-Way ANOVA p=0.001). Moreover, we found P1NP levels significantly decreased in the Androgenized OVX group (mean + SEM) of 58.57 + 4.41 ng/ml against 88.02 + 8.49 ng/ml in Control OVX versus (ANOVA p<0.0001) indicating lower bone formation. Our results suggest that bone and metabolic features of Androgenized rats are affected by ovariectomy with a negative impact on bone formation.
Assunto:	Bone and bones Femur Ovariectomy
Idioma:	eng
País:	Brasil
Editor:	Universidade Federal de Minas Gerais
Sigla da Instituição:	UFMG
Departamento:	FAO - DEPARTAMENTO DE ODONTOLOGIA RESTAURADORA
Tipo de Acesso:	Acesso Aberto
Identificador DOI:	10.1210/jendso/bvaa046
URI:	http://hdl.handle.net/1843/51145
Data do documento:	8-Mai-2020
metadata.dc.url.externa:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7208756/
metadata.dc.relation.ispartof:	Journal of the Endocrine Society
Aparece nas coleções:	Artigo de Periódico

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