Alexandra Montkowski

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The neuropeptide orphanin FQ (also known as nociceptin; OFQ/N) has been implicated in modulating stress-related behavior. OFQ/N was demonstrated to reverse stress-induced analgesia and possess anxiolytic-like activity after central administration. To further study physiological functions of OFQ/N, we have generated OFQ/N-deficient mice by targeted(More)
Over the past years, two breeding lines, derived originally from outbred Wistar rats, have been established that differ markedly and consistently in their anxiety-related behaviour in the elevated plus-maze. At the age of ten weeks, rats were tested once on the elevated plus-maze and the males and females displaying the most anxious and the least anxious(More)
We have used site-directed mutagenesis in conjunction with homologous recombination to generate two mouse lines carrying point mutations in the glycine binding site of the NMDAR1 subunit (Grin1). Glycine concentration-response curves from acutely dissociated hippocampal neurons revealed a 5- and 86-fold reduction in receptor glycine affinity in mice(More)
To develop and validate a vasopressin (AVP) receptor knockdown strategy, we infused an antisense oligodeoxynucleotide to the V1 subtype mRNA into the septum of male rats with osmotic minipumps and measured behavioral, cellular and molecular parameters. Compared to vehicle and scrambled-sequence oligo controls, chronic antisense administration for up to 4 d(More)
Long-term potentiation (LTP) is a potential cellular mechanism for learning and memory. The retrograde messenger nitric oxide (NO) is thought to induce LTP in the CA1 region of the hippocampus via activation of soluble guanylyl cyclase (sGC) and, ultimately, cGMP-dependent protein kinase (cGK). Two genes code for the isozymes cGKI and cGKII in vertebrates.(More)
Anxiolytic effects of ethanol have been proposed to be important factors in the initiation of ethanol consumption. To examine this hypothesis, drug-naive Wistar rats were tested in the elevated plusmaze to determine their initial level of anxiety. Based on their response, we separated the animals into anxious and non-anxious groups. After that, animals went(More)
1. The neuropeptide corticotropin-releasing hormone (CRH) is the main mediator of the neuroendocrine and behavioral response to stress. End-capped phosphorothioate antisense and sense oligodeoxynucleotides (ODN) corresponding to the start coding region of rat CRH mRNA were infused intracerebroventricularly (30 µg/3 μl per injection) three times at 12 hr(More)
Stressful experience during early brain development has been shown to produce profound alterations in several mechanisms of adaptation, while several signs of behavioral and neuroendocrine impairment resulting from neonatal exposure to stress resemble symptoms of dysregulation associated with major depression. This study demonstrates that when applied(More)
Impaired cognitive function and enhanced activity of the hypothalamic-pituitary-adrenocortical system are among the cardinal symptoms of major depression in humans that resolve after successful antidepressant treatment. We used a transgenic mouse model expressing antisense RNA complementary to that of glucocorticoid receptor (GR) mRNA to test the hypothesis(More)
We studied the role of central amygdala CRH receptors in behavioral responses to an anxiogenic stimulus. An antisense oligodeoxynucleotide corresponding to the rat CRH1 receptor mRNA was infused chronically into the central amygdaloid nucleus of male rats via osmotic minipumps (0.25 micrograms/0.5 microliters/h). Control groups received infusions of either(More)