S-077
Impact of Ovariectomy on the Progression of Parkinsonism in Middle-Aged Female Rats
Maria Eduarda Garcia de Andrade1, Maria Micaelle Gomes Dias1, Milena Caroline Nunes Monteiro de Carvalho1, Iasmin Carvalho Dantas1, Caroline Izidrio Andrade1, Abilene Jeane Santos Valle1, Ana Cleia Alves de Luz1, Abraão de Jesus Barbosa1, Rafael José França Oliveira1, Heitor Franco Santos1, Kathy Anne Amador de Lucena Medeiros1, José Ronaldo dos Santos1, Auderlan Mendonça de Gois1
  1. Federal University of Sergipe- UFS/Behavioral and Evolutionary Neurobiology Laboratory - LaNCE
Presenting Author:
Maria Eduarda Garcia de Andrade
andrademarg@outlook.com
Parkinson's disease (PD) is characterized by the progressive loss of dopaminergic neurons and is more prevalent in men over 60 years. In postmenopausal women, PD often progresses more aggressively, which may be related to the abrupt decline in sex hormones. We investigated the progression of reserpine-induced parkinsonism (RES) in middle-age ovariectomized (OV) rats. Female Wistar rats (n=32, 8 months old) with regular estrous cycles were used. Sixteen animals underwent bilateral ovariectomy, and one month after surgery, the absence of estrous cycles was confirmed by vaginal cytology. Animals were allocated to four groups: intact female (CTL-vehicle), intact females with RES (RES), ovariectomized females (OV-vehicle), and ovariectomized females with RES (OV-RES). Parkinsonism was induced with RES (0.1 mg/kg, s.c., every 48 h for 40 days. Behavioral tests included catalepsy, open field and oral movements (OM) (CEUA: 6628240125). Ovariectomized anticipated and worsened RES-induced motor deficit in catalepsy from the day 24th onward but did not exacerbate locomotor impairment in the open field. In the MO test, increases in vacuous chewing, tongue protrusion and oral tremor induced by RES were not intensified by ovariectomy. In conclusion, our findings suggest that female sex hormones deficiency accelerates catalepsy motor deficit but does not affect other motor impairments in the reserpine parkinsonism model. Keywords: Parkinsonian disorders; Sex hormones; menopause; reserpine.