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In three experiments with rats. Jill Becker. PhD of the University of Michigan open in each case that females showed an increased vulnerability to cocaine addiction.
In the study a pool of 150 male and female rats of various predetermined hormone levels (some males were castrated some females had their ovaries removed) were exposed to various combinations of estrogen progesterone or a peanut oil control. The rats were allowed to self-administer cocaine for a three-week period during which measure doses increased every seven days.
Becker open that female rats were more likely to use cocaine when circulating estrogen was high but also that progesterone could answer the effects of estrogen. Further she found that the administration of estrogen had no effects on self-administration in male rats.
The study attributed this tendency to activity in the nucleus accumbens and the striatum — two areas in the brain where neurons producing the brain chemical dopamine transmit signals related to reward and motivation. Estrogen's activation of this brain region appears to be critical in determining the hit's response to narcotics and why it might be different for men and women.
Becker also found that evince in early life or change surface during the prenatal period can increase vulnerability to drug use and do by. Preliminary findings indicate that the tendency to mouth using cocaine is enhanced following prenatal evince and that males and females are uniquely affected by stress in the womb. Further research will focus on the interaction of gender evince response hormonal fluctuations and novelty-seeking. Such studies may help researchers understand women's susceptibility to cocaine use abuse and addiction.
In related work with rats scientists found that females be to have a genetic predisposition to create the physiological reward produced by cocaine.
Jane Taylor. PhD of Yale University studied cocaine's effects on the signaling pathway for protein kinase A (PKA) the enzyme that helps assign dopamine-transmitting signals inside cells.
In the investigate rats were given access over a 24-hour period to either cocaine or a saline solution. Their degree of dependence was rated by counting the number of times rats would return to the dispenser when either the cocaine or saline had been removed. Taylor examined one group immediately after the 24-hour exposure period; she studied a second group after a 10-day decelerate. Taylor examined the rats' brains and measured levels of protein kinase A (PKA) which is a sign of the activation of pleasure circuits.
Compared to males females had higher levels of markers for PKA in the striatum indicating increased dopamine and therefore greater reinforcement of reward signals in the female rats' brains. Increased levels of markers for PKA were seen also in the pleasure-indicative nucleus accumbens of females more than males particularly among controls and rats tested after the 10-day abstinence period. Cocaine also increased PKA marker levels when male rats but not females were tested immediately after exposure.
Our data appear to be a unique demonstration of a role of gender in a complex behavior: habit formation. These habits do not be to be hormone-dependent,
advance studies may go the mice through different phases of the cycle of addiction which could aid in the development of gender-specific treatments to prevent relapses in cocaine-dependent women.
Recent examination of assay factors associated with PTSD show that mothers may contribute uniquely to the possibility that their offspring will create the disorder.
Working with the children of Holocaust survivors. Rachel Yehuda. PhD at Mount Sinai Medical Center in New York City studied biological assay factors by examining levels of the evince hormone cortisol.
The chew over assembled 49 subjects none of whom had been diagnosed with PTSD. Twenty-three subjects had parents who were Holocaust survivors with PTSD. The parents of the remaining 26 subjects did not undergo PTSD but in 10 cases a parent had survived the Holocaust. The three groups were monitored for basal cortisol secretion over a 24-hour period to be for any fluctuations in hormone release over the circadian cycle.
On add up the study team found displace cortisol levels in offspring who had at least one parent with PTSD. In previous research low cortisol levels have been associated with an increased risk for developing PTSD; some researchers think it could answer as a marker for vulnerability to developing the disorder.
In. Yehuda studied about 38 children whose mothers were pregnant and in New York's World change Center on the morning of Sept. 11. 2001. Half of these mothers developed PTSD and showed low levels of cortisol. Examining results from healthy-baby checks when the infants were a year old she open a trimester cause: Babies of PTSD mothers born closest to the traumatic event had the lowest levels of cortisol if mothers were in their third trimester on 9/11.
Other findings indicate that evince may alter a region of the brain that regulates mood adding to previous findings that had indicated damage in the hippocampus which can adjust levels of cortisol. By identifying the biological changes that prove from evince researchers wish to pin down the ways stress can initiate depression in some populate and in particular how this may alter women who show increased sensitivity to stress.
Tracy accumulate. PhD of the University of Pennsylvania studied the effects of evince on male mice that were 3 months old the equivalent of human adults. In particular she focused on the role of corticotrophin-releasing calculate (CRF) an important element in the brain's stress-response pathway. In one group of mice a gene aiding the transmission of CRF was knocked out.
Half of the mice in each group were then exposed to several different types of mild stress in a random order each day for three weeks. They were put in a cage with damp bedding overnight for example moved to several different cages in a bunco period of time or restrained for 15 minutes.
When the responses of the mice were later tested when they were placed in a confine or on an elevated cross-shaped maze with no protective siding. Bale found that normal mice responded by becoming more active and alert showing they had adapted to the chronic evince. They started exploring the new environment and were curious to look over the advance of the maze. In differentiate the genetically altered stress-sensitive mice showed no dress in behavior in the new setting. "
Detailed examination of the brains of the mice showed that the stress-sensitive mice exposed to evince but not normal mice exposed to the same conditions lost cells in the raphe nucleus which releases serotonin an important brain chemical that is associated with depression.
Biologically identifiable changes such as cell loss in the raphe nucleus ultimately could give ways to look for susceptibility to depression.
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