Testosterone and opioids interact to regulate feeding in a male migratory songbird

Deviche, Pierre

doi:10.1016/0018-506x(92)90009-k

Cited by 45 publications

(21 citation statements)

References 53 publications

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“…Similarly, in pigeons, the intracerebroventricular injection of P-END specifically induces hyperphagia without any hyperdipsia (Deviche and Wohland, 1984;Deviche and Schepers, 1984). This is consistent with the fact that naloxone attenuates feeding in this species and in the junco, presumably through a central action (Cooper and Turkish, 1981;Deviche, 1992).…”

supporting

confidence: 77%

Distribution of β‐endorphin‐like‐immunoreactive structures in the chicken and quail brain as demonstrated with a new homologous antibody directed against a synthetic peptide

Gils

Absil

Moons

et al. 1994

J of Comparative Neurology

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A polyclonal rabbit antibody was raised against a synthetic peptide fragment located at the C-terminal end of turkey beta-endorphin (beta-END) and used to analyze the distribution of beta-END-immunoreactive-like structures in the quail and chicken brain. Three major groups of immunopositive cells were detected in the preoptic area-hypothalamus complex. A thin layer of immunopositive cells was parallel and adjacent to the ventral edge of the brain in the preoptic and anterior hypothalamic region, a more numerous group of immunoreactive perikarya was located along the walls of the third ventricle in these same regions, and, finally, a few scattered cells were found in a more lateral position on both the internal and external sides of the tip of the fasciculus prosencephali lateralis. The periventricular cell population extended in the caudal direction until the posterior hypothalamus. Labelled fibers were always associated with these immunoreactive perikarya, and they were also found in the adjacent hypothalamic regions. A dense innervation of the median eminence was also detected. These data are compared with previous studies in mammals and birds that had identified more restricted populations of immunoreactive cells and the possible sources of the observed discrepancy are discussed. The functional significance of the present data is also briefly analyzed.

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supporting

confidence: 77%

Distribution of β‐endorphin‐like‐immunoreactive structures in the chicken and quail brain as demonstrated with a new homologous antibody directed against a synthetic peptide

Gils

Absil

Moons

et al. 1994

J of Comparative Neurology

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“…We weighed capsules before implantation and again after removal (D66: five T males; D74: five remaining T males) and oven drying at 37°C for several days and used the difference between the initial and final weights of the capsules to calculate that the average release rate of T was 112±2·µg·day -1 ·bird -1 (mean ± S.D.). This rate compares favorably to that in another passerine of similar size (dark-eyed junco: 92·µg·day -1 ·bird -1 ; Deviche, 1992).…”

Section: Testosterone Capsule Implantation and Removalmentioning

confidence: 56%

“…Immediately after blood collection, we weighed birds to the nearest 0.1·g and measured their cloacal protuberance width (an androgen-dependent secondary sexual characteristic: Deviche, 1992;Dloniak and Deviche, 2001) to the nearest 0.1·mm using digital calipers.…”

Section: Morphological Parametersmentioning

confidence: 99%

Androgen control of immunocompetence in the male house finch,Carpodacus mexicanusMüller

Deviche

Cortez

2005

Journal of Experimental Biology

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SUMMARY The immunocompetence handicap (ICH) hypothesis predicts that elevated levels of the gonadal androgen testosterone (T) entail obligatory costs, such as immunosuppression, but evidence supporting this immunosuppressive influence is equivocal. To investigate this question, adult males house finches, Carpodacus mexicanus, were exposed to short days and chronically treated with T-filled (T males; N=10) or empty (C males; N=10) Silastic capsules. Testosterone administration increased plasma T levels and the size of the cloacal protuberance, an androgen-dependent secondary sexual characteristic. To study humoral immunity, finches received injections of sheep red blood cells (SRBC) and we measured circulating concentrations of antibodies to these cells with a hemagglutination test. All males produced antibodies following four SRBC injections at weekly intervals. Antibody titers in T and C males did not differ 5 days after the fourth injection, but were 59% lower in T than C males 2 weeks later. To study cell-mediated immunity, we measured the local inflammatory response to an injection of phytohemaglutinin (PHA). This response in T and C males was similar 1 day after PHA injection, but was 58% less in T than C males 2 days following the injection. Thus, T and C males mounted similar humoral and cell-mediated immune responses, but T treatment compromised maintenance of these responses. The results, demonstrating immunosuppressive effects of elevated T, are consistent with the ICH hypothesis.

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“…More directly, Buchanan et al (2001) experimentally showed in male house sparrows (Passer domesticus) that elevated testosterone levels increased metabolic rate and development of an androgendependent sexual ornament, the bib size, suggesting a metabolic cost of dominance signalling. By contrast, testosterone implantation in intact birds did not affect mass-specific basal metabolic rates in captive male white-plumed honeyeaters (Lichenostomus penicillatus; Buttemer and Astheimer, 2000) and in dark-eyed juncos (Deviche, 1992). Unfortunately, no data were provided about the activity levels of the birds in relation to treatment in either study.…”

mentioning

confidence: 84%

Steroids for free? No metabolic costs of elevated maternal androgen levels in the black-headed gull

Eising

Visser

Müller

et al. 2003

Journal of Experimental Biology

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Within-and between-clutch variation in yolk titres of hormones of maternal origin has been found in many avian species. So far, experiments have revealed mainly beneficial effects of maternal androgens. This would also apply to black-headed gulls (Larus ridibundus). Previous experiments have shown that chicks benefit from these higher levels since their competitive abilities are improved and growth and survival probabilities thus enhanced. However, not all females show the same increase in yolk hormones from first to last egg or invest equally high amounts of androgens in their clutches. Possibly, there is a trade-off between the beneficial effects of high androgen levels and potential costs, such as increased metabolic rates. We studied possible metabolic costs of experimentally elevated yolk androgen levels for chicks of several age classes, starting three days prior to hatching until fledging at an age of approximately 30·days. Daily energy expenditure in the field, measured using the doubly labelled water technique, did not differ between treatments or between sexes. Oxygen consumption measured in birds at rest in the lab (RMR) did not vary between chicks hatched from androgen-injected (T) or oilinjected (Oil) control eggs at any age in thermo-neutral or below thermo-neutral conditions. Males showed a lower RMR than females towards the fledging age. We conclude that it is unlikely that the costs of high maternal androgen levels can be found in higher energy expenditure in the chick.

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Testosterone and opioids interact to regulate feeding in a male migratory songbird

Cited by 45 publications

References 53 publications

Distribution of β‐endorphin‐like‐immunoreactive structures in the chicken and quail brain as demonstrated with a new homologous antibody directed against a synthetic peptide

Distribution of β‐endorphin‐like‐immunoreactive structures in the chicken and quail brain as demonstrated with a new homologous antibody directed against a synthetic peptide

Androgen control of immunocompetence in the male house finch,Carpodacus mexicanusMüller

Steroids for free? No metabolic costs of elevated maternal androgen levels in the black-headed gull

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