Panic‐like responses of female Wistar rats confronted by Bothrops alternatus pit vipers, or exposure to acute hypoxia: Effect of oestrous cycle

2021 ◽  
Author(s):  
Renata Ferreira‐Sgobbi ◽  
Rebeca Machado Figueiredo ◽  
Alana Tercino Frias ◽  
Melina Matthiesen ◽  
Matheus Fitipaldi Batistela ◽  
...  
Keyword(s):  
Wistar Rats ◽  
Acute Hypoxia ◽  
Oestrous Cycle ◽  
Bothrops Alternatus ◽  
Female Wistar Rats

NEW DATA CONCERNING THE ROLE PLAYED BY PROGESTERONE IN THE CONTROL OF FOLLICULAR GROWTH IN THE RAT

1974 ◽  
Vol 75 (3) ◽  
pp. 569-578 ◽  
Author(s):  
G. Buffler ◽  
S. Roser
Keyword(s):  
Wistar Rats ◽  
Venous Blood ◽  
Oestrous Cycle ◽  
Female Rats ◽  
Cycle Duration ◽  
Follicular Growth ◽  
The Third ◽  
Female Wistar Rats

ABSTRACT The mechanisms involved in the prolongation of the oestrous cycle following LH administration were studied in 4-day cyclic female Wistar rats. In females injected with LH on the morning of dioestrus I there was an increase in ovarian venous blood progesterone as compared with non-injected animals. In both LH-treated females, and those injected with progesterone on the morning of dioestrus I, a slowing up in follicular growth was observed from the afternoon of dioestrus I. The size of follicles greater than 400 urn present in LH or progesterone injected animals on the third day of cycle was similar to the size reached by the same range of follicles in non-injected animals on the second day of the cycle. Hence, the increase in endogenous ovarian progesterone elicited by LH was considered as the cause of the slowing up of follicular growth and therefore of the lengthening of the oestrous cycle duration in female rats injected with LH at the beginning of 4-day cycle.

Comparative study of n-hexane extract and emulsion formulation of a phytodrug (RICOM 1013-J) on the oestrous cycle of female Wistar rats

2018 ◽  
Vol 14 (2) ◽  
pp. 142
Author(s):  
Ekwere Ekwere ◽  
Plangnan Keswet ◽  
Rosaleen McNeil ◽  
Ikoni Ogaji ◽  
Ekerette Ekpo ◽  
...  
Keyword(s):  
Comparative Study ◽  
Wistar Rats ◽  
Hexane Extract ◽  
Oestrous Cycle ◽  
Female Wistar Rats ◽  
Emulsion Formulation

scholarly journals The impact of radiofrequency electromagnetic radiation from mobile phone on oestrous cycle and reproductive hormones in female wistar rats (Rattus norvegicus)

2021 ◽  
Vol 9 (3) ◽  
pp. 282-288
Author(s):  
A.O. Olarinoye ◽  
A.O. Oyewopo ◽  
J.K. Olarinoye ◽  
B.A. Olagbaye
Keyword(s):  
Serum Level ◽  
Electromagnetic Radiation ◽  
Wistar Rats ◽  
Reproductive Hormones ◽  
Oestrous Cycle ◽  
Control Group ◽  
Female Wistar Rats ◽  
Group A ◽  
The Impact ◽  
Radiofrequency Electromagnetic Radiation

Aim of Study: The study was aimed at evaluating the impact of radiofrequency electromagnetic radiation (RF-EMR) from mobile phones on the oestrous cycle and reproductive hormones in female Wistar rats.Methods: Twenty-one Mature female Wistar rats weighing 180 to 250 grams were acclimatized for 2 weeks and divided into control (A), 4hrs (B) and 6hrs (C) groups and were exposed to RE-EMF for a period of 28 days. Oestrous cycle was monitored daily and hormonal level was determined using standardized enzymatic colorimetric methods. One-way analysis of variance was used to compare the mean values of variables among the groups accepting statistical significance at p≤ 0.05.Results: Oestrous cycle was deranged in experimental group compared to the control. Mean serum level of Follicle stimulating hormone (FSH) in control group remained low compared to the exposed groups. Luteinizing hormone (LH) levels in group A were almost double that of the group B and C, while the serum level of Oestrogen was lowest in group A. Progesterone level in the control group was higher than the experimental group.Conclusion: RF EMR showed an adverse effect on the weight and oestrous cycle but the effect on the reproductive hormones is not  significant although the effect appeared to be related to the duration of exposure. 

Passage pressure across the uterotubal junction during the 4 phases of the oestrous cycle in the rat

1994 ◽  
Vol 28 (4) ◽  
pp. 364-368
Author(s):  
J. Ortega-Moreno ◽  
J. M. Caballero-Gómez
Keyword(s):  
Wistar Rats ◽  
Oestrous Cycle ◽  
Acetate Group ◽  
Female Wistar Rats ◽  
Left And Right ◽  
The Right

The closure strength of the uterotubal junction (UTJ) was measured in 90 2.5 month old cycling female Wistar rats, assigned to 9 groups of 10 each. The passage pressure in both left and right UTJ were registered in pro-oestrus, oestrus, metoestrus and dioestrus phases. Five other groups were formed with rats which had been treated for 3 weeks with oestradiol (group E) or medroxiprogesterone acetate (group P), and with animals which had been ovariectomized 75 days prior to registering the pressure (ovariectomized group) or ovariectomized and treated with oestradiol (group Ov-E) or medroxiprogesterone acetate (group Ov-P). The passage pressure of the right and left UTJ in each animal was similar in each of the groups. The pressures obtained in the oestrus phase or in the E and Ov-E groups were significantly smaller than those registered in dioestrus or in the P and Ov-P groups, and only slightly smaller than that obtained in the pro-oestrus and metoestrus phases. The results indicate that the swelling of the mucosa mediated by oestrogens is not the cause of the tubal locking in the rat.

Some morphological and hormonal aspects of ovulation and superovulation in the rat

1994 ◽  
Vol 141 (1) ◽  
pp. 91-100 ◽  
Author(s):  
M Szołtys ◽  
J Galas ◽  
A Jabłonka ◽  
Z Tabarowski
Keyword(s):  
Wistar Rats ◽  
Histological Analysis ◽  
General Pattern ◽  
Mature Female ◽  
Oestrous Cycle ◽  
Preovulatory Follicles ◽  
Female Wistar Rats ◽  
Theca Interna ◽  
Histological Procedure ◽  
Pregnant Mare Serum Gonadotrophin

Abstract In the first experiment, mature female Wistar rats, displaying a regular 4-day oestrous cycle, were killed in succession every 2 or 3 h on the day of pro-oestrus and oestrus until the time of ovulation. In the second experiment, immature female Wistar rats (aged 24 days) were injected s.c. with 30 IU pregnant mare serum gonadotrophin (PMSG) and 56 h later with 20 IU human chorionic gonadotrophin (hCG). They were killed in groups at 0, 24, 48, 56 and 57 h, and then every 2 h until 72 h. Excised ovaries were homogenized and analysed for steroid content or they were submitted to a routine histological procedure. The cyclic and PMSG/hCG-treated rats exhibited some similarities and differences in the general pattern of steroid content. Either a presumptive endogenous LH surge or administration of hCG resulted in an increase in the ovarian androgen concentration which preceded a rise in progesterone; the progesterone peak, in turn, was accompanied by a fall in the amount of androgens and oestradiol. However, in comparison with cyclic rats, superovulated animals displayed a significantly higher ovarian androgen level for a prolonged period; ovarian oestradiol concentration was also raised while the progesterone content was much lower. Histological analysis revealed large differences between the ovaries of superovulated and cyclic rats, especially with regard to the maturing follicles. The majority of PMSG/hCG-derived follicles showed hypertrophied theca interna and degenerated or luteinized granulosa. A large number of preovulatory follicles did not ovulate. These results clearly indicate that PMSG/hCGinduced follicles are not equal to the follicles developing during a normal oestrous cycle. This should be taken into consideration when using superovulated animals in experiments. Journal of Endocrinology (1994) 141, 91–100

Oral in vivo Bactofection in Dextran Sulfate Sodium Treated Female Wistar Rats

2010 ◽  
Vol 58 (3) ◽  
pp. 171-176 ◽  
Author(s):  
Roland Pálffy ◽  
Michal Behuliak ◽  
Roman Gardlík ◽  
Peter Jáni ◽  
L'udevít Kádaši ◽  
...  
Keyword(s):  
Wistar Rats ◽  
Dextran Sulfate ◽  
Dextran Sulfate Sodium ◽  
Female Wistar Rats
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