Assessment of cochlear effects and extra-auditory disorders in male rats exposed repetitively to low noise [Evaluation des atteintes cochléaires et des troubles extra-auditifs chez des rats mâles exposés d’une façon répétitive au bruit]
Gannouni N.,Laboratoire Of Physiologie Integree |
Gannouni N.,Laboratoire Of Toxicologie |
Mhamdi A.,Laboratoire Of Toxicologie |
Lenoir M.,Institute Des Neurosciences Of Montpellier |
And 6 more authors.
Tunisie Medicale | Year: 2015
Background: The noise is considered as a factor of environmental stress, causing a wide range of health effects such as acoustic, cardiovascular, nervous and endocrine systems. Purpose: The present study was conducted to examine the affects of repeated exposure to noise on the peripheral auditory system, adrenal gland and heart tissue. Method: The White strain rats “Wistar” were exposed to chronic and repetitive exposure noise at two different intensity levels of 70 and 85dB (A). The noise level was generated by the Audacity® software to an octave-band noise (8616 kHz). The sound exposure duration was 6 hr/day, 5 days per week for 3 months. Quantitative and qualitative investigations were performed by using electron microscopy. The ganglion neuron counting was examined via light microscopy. Results : The results show that exposure to sound intensities 70 and 85 dB (A) for long periods, lead to changes in the morphological structure of the cochlea (inner ear), adrenal cortex and cardiac tissue which involve cell disruption which over time can lead to pathological effects. Conclusion : This study provides morphological evidence that repetitive exposure noise at moderate sound levels to 70 and 85 dB (A) induces changes in the peripheral auditory system, the adrenal cortex and heart tissue. © 2015, Maison du Medicine. All rights reserved.
Souli A.,Institute Superieur Of Biotechnologie Of Beja |
Souli A.,Tunis el Manar University |
Sebai H.,Institute Superieur Of Biotechnologie Of Beja |
Sebai H.,Laboratoire Of Physiologie Integree |
And 6 more authors.
Journal of Medicinal Food | Year: 2014
The current study was performed to measure the chemical composition and the effects of dates pulp extract and palm sap on gastrointestinal transit (GIT) activity in healthy adult rats. In this respect, male Wistar rats fasted for 24 hours were used and received per orally (p.o.) sodium chloride (NaCl) (0,9%) (control group) or various doses of dates pulp extract (150 and 300mg/kg, body weight [b.w.]) and palm sap (0.4 and 4mL/kg, b.w.). Two other groups of rats (batch tests) received, respectively, clonidine (an alpha-2 adrenergic agonist, 1mg/kg, b.w.) and yohimbine (an alpha-2 adrenergic antagonist, 2mg/kg, b.w.). Chemical analysis showed that the dates pulp extract is more rich in sugars and minerals, especially potassium and sucrose, as compared with palm sap composition. On the other hand, in vivo study showed that the aqueous dates pulp extract significantly, and dose dependently, increased the GIT activity while the palm sap slightly increased it. Moreover, a converse effect has been observed using clonidine (decreased 68%) and yohimbine (increased 33%) on the GIT activity. These findings suggest that dates pulp extract and palm sap have a stimulating effect on GIT activity in rats and confirm their use in traditional Tunisian medicine for the treatment of constipation. © 2014 Mary Ann Liebert, Inc.
Ghodbane S.,Laboratoire Of Physiologie Integree |
Amara S.,Laboratoire Of Physiologie Integree |
Lahbib A.,Laboratoire Of Physiologie Integree |
Louchami K.,Free University of Colombia |
And 3 more authors.
Environmental Science and Pollution Research | Year: 2014
In the present study, we investigate the effects of a possible protective role of vitamin E (vit E) or selenium (Se) on glucose metabolism disruption induced by static magnetic field (SMF) in rats. Rats have been exposed to SMF (128 mT, 1 h/day during 5 days). Our results showed that SMF failed to alter body weight and relative liver weight. Our data demonstrated that exposure to SMF increased (+21 %) blood glucose level and caused a decrease (−15 %) in liver glycogen content. Moreover, the same treatment induced a reduction of pancreatic islet area. Interestingly, supplementation with vit E (DL α-tocopherol acetate, 150 mg/kg per os during 5 days) prevented alterations induced by SMF on glucose metabolism and liver glycogen content, whereas supplementation with Se (Na2SeO3, 0.20 mg/l, in drinking water for 4 weeks) restored only hepatic glycogen contents. By contrast, both vit E and Se failed to correct the area of pancreatic islets. © 2014, Springer-Verlag Berlin Heidelberg.