Navigation Links
Early isolation linked to enhanced response to cocaine
Date:4/16/2009

NEW ORLEANSDrug addiction affects millions of people around the world, causing numerous problems ranging from emotional and psychological difficulties to physical and health issues. Initial drug use can be motivated by curiosity or peer pressure, but in some animals, such as rats, it can also be the result of a stressful early life event, such as social isolation. A new study examines the impact of social isolation on the animal's response to cocaine.

The study, Social Isolation During Perinatal Development Alters the Behavioral Response to Cocaine in Juvenile Rats, was conducted by Natasha Lugo-Escobar, Nicole Carreras and Annabell C. Segarra, University of Puerto Rico, School of Medicine, Rio Piedras, PR. The team will present its findings at the 122nd Annual Meeting of the American Physiological Society (APS; www.the-aps.org/press), which is part of the Experimental Biology 2009 scientific conference. The meeting will be held April 18-22, 2009 in New Orleans.

The Study

Drugs of abuse act on the reward centers of the brain. These areas are normally involved in mediating pleasure, and also regulate the psycho-stimulant effects of drugs such as cocaine. Stress is known to enhance drug seeking behavior, as well as the psychostimulant effects of cocaine. Since rats are social animals, isolation was used as a stressor to explore the association between stress during development and susceptibility to the psychostimulant effects of drugs of abuse, such as cocaine.

Rats were stressed: (1) as fetuses (by housing the pregnant mother alone), (2) as neonates (by isolating newborn rats for 1 hr daily during the first 9 days of life) or as adolescents (by housing each rat separately during days 21-35). Two additional groups: (4) isolated as fetuses, neonates and adolescents and (5) controls - not isolated during any developmental period, comprised the 5 groups studied. When rats reached 21 days of age, they were weaned from their mothers and tested for the psychostimulant response to cocaine as well as for the development of sensitization, a phenomenon characterized by an increase response to the same amount of a drug over time. For 5 days, half of the rats from all groups were injected with saline and the other half with cocaine (15 mg/kg). This was followed by a 7 day drug free period and an additional cocaine injection on day 13. Locomotor activity was measured on days 1, 5 and 13 immediately after injection.

Results

The researchers found that:

  • Rats that were isolated during all three developmental periods, showed a higher locomotor response to cocaine than control rats.
  • The study indicates that the developmental period most susceptible to isolation stress, particularly in males, is the neonatal period, since males isolated as neonates show an increase in the locomotor, and sensitized response to cocaine, compared to male control and to female rats.

Conclusions

This study suggests that isolation during early development alters the brain sensitivity to cocaine, such that when the animal reaches adolescence and is exposed to cocaine, it is more sensitive to the psychostimulant effects of the drug.

These studies contribute to understanding the mechanisms that may lead to greater abuse of drugs during adolescence.

Additional studies are planned.


'/>"/>

Contact: Donna Krupa
dkrupa@the-aps.org
703-967-2751
American Physiological Society
Source:Eurekalert

Related biology news :

1. Early administration of antiretroviral therapy can improve survival
2. Compendium of pancreatic cancer biomarkers established as strategic approach to early-detection
3. Novel lung cancer vaccine shows promise in fighting early-stage lung cancer
4. Early family ties: No sponge in the human family tree
5. Two innovative University of Texas at Austin biologists become HHMI Early Career Scientists
6. Two Hutchinson Center researchers named HHMI Early Career Scientists
7. Peter Baumann named Howard Hughes Medical Institute Early Career Scientist
8. Whitehead member Peter Reddien named HHMI Early Career Scientist
9. Deep-sea rocks point to early oxygen on Earth
10. No consistent advantage for planting soybean early
11. Study to evaluate success of parental involvement in early childhood education
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/13/2017)... According to a new market research report "Consumer IAM Market by Solution ... Authentication Type, Deployment Mode, Vertical, and Region - Global Forecast to 2022", ... 14.30 Billion in 2017 to USD 31.75 Billion by 2022, at a ... ... MarketsandMarkets Logo ...
(Date:4/6/2017)... , April 6, 2017 ... RFID, ANPR, Document Readers, by End-Use (Transportation & Logistics, ... Facility, Oil, Gas & Fossil Generation Facility, Nuclear Power), ... Educational, Other) Are you looking for a ... sector? ...
(Date:4/3/2017)... , April 3, 2017  Data captured ... engineering platform, detected a statistically significant association ... prior to treatment and objective response of ... potential to predict whether cancer patients will ... treatment, as well as to improve both pre-infusion ...
Breaking Biology News(10 mins):
(Date:5/22/2017)... ... May 22, 2017 , ... Baltimore biotech ... the Maryland Biohealth community in developing and issuing recommendations to grow Maryland's biohealth ... Innovation Hub by 2023. , The recommendations are contained in ...
(Date:5/19/2017)... Shirley, New York (PRWEB) , ... May 19, 2017 , ... ... therapy techniques in treating gait disorders, Biodex Medical Systems, Inc. announces the release of ... time music therapy has been joined with a biomedical system to aid in rehabilitating ...
(Date:5/18/2017)... ... May 16, 2017 , ... Clinical Supplies Management (“CSM”), ... as the company continues to grow. CSM has doubled in size over the ... executing an aggressive growth strategy. , Roger Gasper joins CSM as Chief Financial Officer. ...
(Date:5/18/2017)... ... May 17, 2017 , ... USDM Life Sciences , ... life sciences and healthcare industries, is honored that Jay Crowley was ... in Brussels, Belgium. , Crowley played a crucial role in the development of ...
Breaking Biology Technology: