Christina B Craig-Veit

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Brains of nonmammalian vertebrates typically contain multiple forms of gonadotropin-releasing hormone (GnRH). Until recently, only the mammalian form of GnRH (mGnRH) had been isolated in placental mammals. Biochemical and histological data show that both mGnRH and chicken-II GnRH (cGnRH-II) are present in a primitive placental mammal, the musk shrew (Suncus(More)
It is well established that parenteral treatment of female zebra finch chicks with estradiol masculinizes their song control nuclei and that as adults they are capable of song. Concern over the widespread use of putative environmental estrogens caused us to ask whether oral exposure to estrogens (a natural route of exposure) could produce similar effects.(More)
We determined whether short-term, posthatch oral exposure to estradiol benzoate (EB) or the industrial surfactant octylphenol (OP) could impair the reproductive performance of zebra finches. If so, naturally occurring phytoestrogens and xenoestrogens might influence reproduction in wild populations. Chicks were given oral administration of 10 or 100 nmol EB(More)
Chicken gonadotropin-releasing hormones I and II (cGnRH I and II) were measured by radioimmunoassay (RIA) in extracts of microdissected regions of turkey hen brain (preoptic area [POA], region of periventricular nuclei [PHN], septum [SEP], hippocampus [HP], dorsomedial thalamus/habenula [DMT], midbrain central gray [MCG], and caudal lateral hypothalamus(More)
Both chicken gonadotropin-releasing hormones I and II (cGnRH I and II) were detected in abundant quantity by radioimmunoassay of extracts of Japanese quail medial basal hypothalamic/preoptic area (MBH/POA) fragments that included the median eminence (ME) region. However, in radioimmunoassayed extracts of Japanese quail ME alone, the concentration of cGnRH I(More)
Photorefractoriness in commercial turkey hens can be viewed as a failure of previously sexually stimulatory photoperiods to maintain egg production via activation of cGnRH I neurons, but the neural locus of photorefractoriness, i.e., where in the brain failure occurs, is not known. We used a c-fos antiserum that detects c-Fos and Fos-related antigens to(More)
Several lines of evidence support a role of endogenous opioids in the brain's regulation of gonadotropin secretion in birds and mammals, although the neuroanatomic basis of such regulation is not clear. We used double-label fluorescence immunohistochemistry employing polyclonal antisera raised in sheep against chicken gonadotropin-release hormone I (cGnRH(More)
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