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Early Life Stress Alters The Open Field Behavior Of L-Name Treated Rats

Mahidol University Annual Research Abstracts

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Travel Agency   Mahidol University Annual Research Abstracts, Vol.28, 2001

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Travel Agent                     Prior to unblinding, the first three cohorts had been followed up to 88 weeks. Observing the trend up to Week 88, we the Remune group showed stable CD4 count, increase in body weight and over 80% of subjects in the Remune arm sustained a stable or decrease in viral load. Almost 30% of the subjects showed a decrease of about 1 log from the baseline level. This decrease correlates with the body weight, CD4 cells, Western blot and %CD4/CD8 ratio data. These results confirm the benefit of Remune in controlling the level of HIV virus while increasing humoral and cellular immunity, all of which are considered very important to induce a long-term progressive condition in HIV-infected persons.

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Hotel Reservation   EARLY LIFE STRESS ALTERS THE OPEN FIELD BEHAVIOR OF L-NAME
  TREATED RATS (NO. 666)

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Discount Travel Sompop Soo-ampon and Noppamars Wongwitdecha

Orlando Hotel Department of Pharmacology, Faculty of Science, Mahidol University, Bangkok, THAILAND.

Booking Agency Key words : Stress, Open field behavior, Nitric oxide synthase inhibitor

International Travel Medical                     Early life stress has been reported to alter the behaviors and the neurochemical properties of the adult animals and modify the responsitivity to many psychotropic agents. The present study determined whether early life stress (social isolation from weaning) alters the behavioral response produced by a nitric oxide synthase inhibitor, NG-nitro-L-arginine methyl ester (L-NAME) in the open field test.

New York Hotel                     Methods : Male Wistar rats were raised from weaning either alone (isolation rearing) or groups of five rats/cage (social rearing). After five weeks, both socially and isolation reared rats were placed individually into a circular open field arena under high light condition (500 lux) for a 5 min test.

Online Travel Booking                     Results : Under high light condition, untreated isolation reared rats exhibited hypolocomotor activity (as indicated by reduction of total zone transitions) and reared less than socially reared rats. Both socially and isolation reared rats spent more time in the outer zone (P<0.05), however, isolation reared rats spent longer time in the inner zone than the socially reared rats. Systemic administration of L-NAME (10 and 25 mg/kg i.p.) decreased locomotor activity in socially reared rats, but had no effect on the isolation reared rats. L-NAME significantly reduced the number of reared and time spent on the inner zone of the circular open field arena in both socially and isolation reared rats, however, these effects were more pronounced in the isolation reared rats.

Travel Medical Insurance                     Conclusion : The results indicate that early life stress e.g., rearing rats in social isolation from weaning alters the effects of L-NAME in the mature rats. This finding thus shows that stress could play a role in the modulation of nitric oxide in the central nervous system.

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Las Vegas Nv Hotel   EFFECTS OF LIGHT INTENSITY ON LOCOMO-TOR ACTIVITY IN ISOLATION
  AND SOCIALLY REARED RATS (NO. 667)

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Orlando Travel Noppamars Wongwitdecha1, Ekawit Threenet2, Sompop Soo-ampon1, and Haruthai Thaidee2

Hilton Hotel 1Department of Pharmacology, 2Toxicology Program, Faculty of Science, Mahidol University, Bangkok, THAILAND

Booking Delta Com Key words : Light intensity, Locomotor activity, Isolation reared rats

Travel Insurance Online                     Rearing conditions after weaning have profound consequences on behavior of the adult animals (1-3). We have investigated the effects of light e.g., red light, low light (50 lux) and high light (500 lux) on locomotor activity in rats reared with different conditions (isolation and socially reared rats).

London Hotel                     Methods : Male Wistar rats were obtained at 21 days of age (weaning) and housed either singly (isolation rearing) or groups of five rats/cage (social rearing) for five weeks. These rats were placed individually into an open field arena under red light, low light (50 lux) and high light (500lux conditions for a 5 min test.

Online Hotel Booking                     Results : Under red light and low light (50 lux) conditions, isolation reared rats exhibited hyperlocomotor activity (as indicated by increase total zone transitions) and reared significantly more than socially reared rats. However, under high light condition (500 lux), isolation reared rats showed hypolocomotor activity (as indicated by reduction of total zone transitions) and reared less than socially reared rats. Both socially and isolation reared rats spent more time in the outer zone (P<0.05), however, isolation reared rats entried and spent longer time in the inner zone than the socially reared rats.

Travel Insurance                     Conclusion : The results demontrate that social isolation from weaning alters locomotor activity and modifies the open field behavior of the adult rats when exposed to different light intensity.

Paris Hotel (References: 1.Wongwitdecha, N., and Threenet, E. (2000) The International Journal of Neuropsychopharmacology 3(Suppl 1): S295.2. Wongwitdecha, N., and Marsden, C.A. (1996) Behav. Brain Res., 75: 27-32. 3. Wongwitdecha, N., and Marsden, C.A. (1995) Eur. J. Pharmacol., 279: 99-103.)

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