Preoptic Area Infusions of Morphine Disrupt—and Naloxone Restores—Parental-Like Behavior in Juvenile Rats

Wellman, Jacqueline; Carr, David B.; Graham, Amanda L.; Jones, Hendrée E.; Humm, J.; Ruscio, Michael; Billack, Blasé; Kinsley, Craig Howard

doi:10.1016/s0361-9230(97)00111-1

Cited by 18 publications

(22 citation statements)

References 53 publications

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“…This determines the capacity of endogenous and exogenous opioids to regulate the level of maternal motivation. The effect of morphine, inhibiting all manifestations of parental behavior and maternal aggression, is studied best of all [10,13]. Our experiments demonstrated similar effects of systemic administration of β-casomorphines (opioid fragments of caseins, penetrating into female blood from the mammary gland) [3].…”

Section: Resultsmentioning

confidence: 71%

“…Effects of opioid antagonists on the level of maternal motivation are less studied; usually the drugs of this group are used for suppressing the aftereffects of morphine and endorphins [13]. Attempt at the analysis of antagonist activity was undertaken only for naloxone [6]: the drug was injected subcutaneously (0.5 and 5 mg/kg) and intracerebroventricularly (5 and 50 µg).…”

Section: Resultsmentioning

confidence: 99%

“…These conditions can be caused by high activity of endogenous opioid system or excess of endorphin-like peptides (fragments of alimentary proteins) in the body [9]. It was shown in animal experiments that opioid receptor agonists (morphine and its derivatives) in analgetically inert doses attenuate female reaction to progeny [13]. Hence, it can be expected that opioid antagonists can produce a positive (activating) effect on components of the maternal behavior.…”

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confidence: 99%

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Effect of Opioid Antagonist Naloxone on Maternal Motivation in Albino Rats

et al. 2005

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We studied the effect of nonselective antagonist of opioid receptor naloxone on the behavior of albino female rats on days 4-6 after delivery. Intraperitoneal injection of naloxone (5 mg/kg) significantly stimulated maternal reactions (increased the number of approaches to pups, decreased the latency of their transfer into new location). Intranasal naloxone (1 mg/kg) produced similar changes. Naloxone in intraperitoneal dose of 1 mg/kg and intranasal dose of 0.2 mg/kg virtually did not modify maternal behavior.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Effect of Opioid Antagonist Naloxone on Maternal Motivation in Albino Rats

et al. 2005

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“…Although there are few studies that address this issue, one set of studies suggests that these systems may well be the same. For instance, Wellman et al (1997) have found that as in the adult female, bilateral infusions of morphine disrupted parental behaviors in female and male juveniles, whereas morphine and naloxone did not. These data suggest not only that opioids may be involved in maternal behavior in the juvenile, but that as in the adult, the MPOA is the central site regulating those responses in the juvenile.…”

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confidence: 99%

The effects of medial preoptic area and amygdala lesions on maternal behavior in the juvenile rat

Oxley

Fleming

2000

Dev. Psychobiol.

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The present study was designed to determine whether the medial preoptic area (MPOA) and the amygdala (AMYG) are involved in the expression of ``maternal'' behavior in juvenile rats as they are in the adult. Juveniles show many behaviors that are similar to the maternal behaviors shown by the postpartum female rat. Whether these behaviors are social in function, as opposed to parental, and hence mediated by different mechanisms from those regulating adult maternal behavior is not known. To test the roles of the MPOA and AMYG in mediating these behaviors, 21‐day‐old female juvenile rats received MPOA, AMYG, or SHAM (MPOA/AMYG) lesions and were tested at 22 days of age for maternal and other responses to pups. Major findings demonstrate that MPOA lesions disrupt components of maternal behavior, including retrieving and nest building, while AMYG lesions facilitate these behaviors. These findings indicate striking similarities between the juvenile and rat brain for parental responding. © 2000 John Wiley & Sons, Inc. Dev Psychobiol 37: 253–265, 2000

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“…It is possible that morphine administration alters the endogenous opioid system in brain regions such as POA (Hammer & Bridges, 1987;Hammer, Mateo, & Bridges, 1992;Jacobson, Terkel, Gorski, & Sawyer, 1980;Lee, Clancy, & Fleming, 2000;Vernotica, Rosenblatt, & Morrell, 1999;Wellman et al, 1997), amygdala (Fleming & Walsh, 1994;Komisaruk et al, 2000;Morgan, Watchus, Milgram, & Fleming, 1999), and/or nucleus accumbens (Fleming & Walsh, 1994;Keer & Stern, 1999;Lee et al, 2000;Vernotica et al, 1999), which are thought to be involved in maternal behaviors. Morphine also may induce somatosensory and/or olfactory alterations that might disrupt maternal behaviors (Fleming & Walsh, 1994;Kinsley et al, 1995;Numan & Numan, 1995).…”

Section: Introductionmentioning

confidence: 99%

Long‐term effects of prenatal morphine exposure on maternal behaviors differ from the effects of direct chronic morphine treatment

Šlamberová

Bar

Vathy

2003

Developmental Psychobiology

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Previous studies have demonstrated that chronic morphine treatment of pregnant rats alters maternal behavior. Other studies have shown long-term effects of prenatal exposure to morphine, including changes in reproductive behavior in adult females. The present study investigated the effects of prenatal morphine exposure on a variety of maternal behaviors such as nursing, maternal activities, nonmaternal activities, and pup retrieval. Prenatal morphine exposure increased active and decreased passive nursing. There were no differences in maternal activities such as presence in the nest, contact with pups, grooming of pups, and/or manipulation of nest shavings. In the retrieval test, prenatally morphine-exposed mothers were faster in carrying the first pup, retrieving the first pup back to the nest, and returning all pups to the nest than prenatally saline-exposed mothers. Maternal and nonmaternal activities also were affected by the light: dark cycle. All saline- and morphine-exposed mothers nursed more, were more often in the nest, and more often in contact with greater than half of their litter during the light than the dark sessions. On the other hand, nonmaternal activities increased during the dark sessions: Mothers cared for themselves (groomed, ate) more and displayed more rearing and sniffing. Mothers spent more time resting with their eyes closed during the light sessions regardless of prenatal drug exposure. The present study demonstrated that the effect of morphine on maternal behavior is different in adult exposed and prenatally exposed mothers. While direct morphine treatment impaired maternal behaviors, prenatal morphine exposure has the opposite effect.

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Preoptic Area Infusions of Morphine Disrupt—and Naloxone Restores—Parental-Like Behavior in Juvenile Rats

Cited by 18 publications

References 53 publications

Effect of Opioid Antagonist Naloxone on Maternal Motivation in Albino Rats

Effect of Opioid Antagonist Naloxone on Maternal Motivation in Albino Rats

The effects of medial preoptic area and amygdala lesions on maternal behavior in the juvenile rat

Long‐term effects of prenatal morphine exposure on maternal behaviors differ from the effects of direct chronic morphine treatment

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