journal
https://read.qxmd.com/read/38368844/the-decanoate-esters-of-nandrolone-testosterone-and-trenbolone-induce-steroid-specific-memory-impairment-and-somatic-effects-in-the-male-rat
#21
JOURNAL ARTICLE
Sofia Zelleroth, Frida Stam, Erik Nylander, Ellinor Kjellgren, Johan Gising, Mats Larhed, Alfhild Grönbladh, Mathias Hallberg
Long-term use of anabolic androgenic steroids (AAS) in supratherapeutic doses is associated with severe adverse effects, including physical, mental, and behavioral alterations. When used for recreational purposes several AAS are often combined, and in scientific studies of the physiological impact of AAS either a single compound or a cocktail of several steroids is often used. Because of this, steroid-specific effects have been difficult to define and are not fully elucidated. The present study used male Wistar rats to evaluate potential somatic and behavioral effects of three different AAS; the decanoate esters of nandrolone, testosterone, and trenbolone...
February 17, 2024: Hormones and Behavior
https://read.qxmd.com/read/38364455/thyroid-hormone-concentrations-in-female-baboons-metabolic-consequences-of-living-in-a-highly-seasonal-environment
#22
JOURNAL ARTICLE
Laurence R Gesquiere, Christine Adjangba, Tim L Wango, Vivian K Oudu, Raphael S Mututua, J Kinyua Warutere, I Long'ida Siodi, Fernando A Campos, Elizabeth A Archie, A Catherine Markham, Susan C Alberts
How female mammals adapt metabolically in response to environmental variation remains understudied in the wild, because direct measures of metabolic activity are difficult to obtain in wild populations. However, recent advances in the non-invasive measurement of fecal thyroid hormones, triiodothyronine (T3), an important regulator of metabolism, provide an opportunity to understand how female baboons living in the harsh Amboseli ecosystem in southern Kenya adapt to environmental variability and escape strict reproductive seasonality...
February 15, 2024: Hormones and Behavior
https://read.qxmd.com/read/38354494/pterostilbene-alleviates-cafeteria-diet-induced-obesity-and-underlying-depression-in-adolescent-male-swiss-albino-mice-and-affects-insulin-resistance-inflammation-hpa-axis-dysfunction-and-sirt1-mediated-leptin-ghrelin-signaling
#23
JOURNAL ARTICLE
Rashmi Patil, Urmila Aswar, Nishant Vyas
Cafeteria diet (CD) model for in-vivo studies mimics the western diet having imbalanced nutritional value, high caloric-density and palatability. Uncontrolled eating leads to the development of childhood obesity, poor self-esteem and depression due to its effects on brain development. Herbal supplements are novel inclusion in the management of obesity and mental well-being. Pterostilbene (PTE) found in blueberries and Pterocarpus marsupium heartwood, is known to prevent obesity in invivo models. Adolescent Swiss albino male mice were fed on CD for 70 days and the development of obesity was assessed by gain in body weight, abdominal circumference...
February 13, 2024: Hormones and Behavior
https://read.qxmd.com/read/38350334/delivery-by-cesarean-section-leads-to-heavier-adult-bodyweight-in-prairie-voles-microtus-ochrogaster
#24
JOURNAL ARTICLE
William M Kenkel, Sabreen Ahmed, Miranda Partie, Katelyn Rogers
Delivery by cesarean section now makes up 32.1 % of all births in the United States. Meta-analyses have estimated that delivery by cesarean section is associated with a > 50 % increased risk for childhood obesity by 5 years of age. While this association is independent of maternal obesity, breastfeeding, and heritable factors, studies in humans have been unable to test for a causal role of cesarean delivery in this regard. Here, we set out to use an animal model to experimentally test whether delivery by cesarean section would increase offspring weight in adulthood...
February 12, 2024: Hormones and Behavior
https://read.qxmd.com/read/38342021/effects-of-intrauterine-position-during-gestation-on-specific-endocrine-and-behavioral-parameters-that-impact-reproduction-in-domestic-rabbits
#25
JOURNAL ARTICLE
Lizet García-Fernández, David R Chavira, Kurt Hoffman, Gabriela González-Mariscal
Prior studies from others, performed in a different breed, reported that doe rabbits developing between two male siblings (2 M) during gestation display characteristics indicative of masculinization: larger anogenital distance (AGD), larger submandibular glands, and higher chinning frequency than females with zero (0 M) or one (1 M) contiguous brothers. Similar effects are provoked by injecting androgens to the pregnant doe suggesting that prenatal androgen exposure masculinizes female embryos...
February 10, 2024: Hormones and Behavior
https://read.qxmd.com/read/38340412/odours-of-caterpillar-infested-trees-increase-testosterone-concentrations-in-male-great-tits
#26
JOURNAL ARTICLE
Ségolène Delaitre, Marcel E Visser, Kees van Oers, Samuel P Caro
Trees release Herbivore-Induced Plant Volatiles (HIPVs) into the air in response to damage inflicted by insects. It is known that songbirds use those compounds to locate their prey, but more recently the idea emerged that songbirds could also use those odours as cues in their reproductive decisions, as early spring HIPVs may contain information about the seasonal timing and abundance of insects. We exposed pre-breeding great tits (Parus major) to the odours of caterpillar-infested trees under controlled conditions, and monitored reproduction (timing of egg laying, number of eggs, egg size) and two of its main hormonal drivers (testosterone and 17β-estradiol in males and females, respectively)...
February 9, 2024: Hormones and Behavior
https://read.qxmd.com/read/38320422/special-issue-highlights-of-sbn-2022
#27
EDITORIAL
Farrah N Madison, Nora H Prior, Brian C Trainor
No abstract text is available yet for this article.
February 5, 2024: Hormones and Behavior
https://read.qxmd.com/read/38316079/experimentally-elevated-corticosterone-does-not-affect-bacteria-killing-ability-of-breeding-female-tree-swallows-tachycineta-bicolor
#28
JOURNAL ARTICLE
David A Chang van Oordt, Conor C Taff, Monique A Pipkin, Thomas A Ryan, Maren N Vitousek
The immune system can be modulated when organisms are exposed to acute or chronic stressors. Glucocorticoids (GCs), the primary hormonal mediators of the physiological stress response, are suspected to play a crucial role in immune modulation. However, most evidence of stress-associated immunomodulation does not separate the effects of glucocorticoid-dependent pathways from those of glucocorticoid-independent mechanisms on immune function. In this study, we experimentally elevated circulating corticosterone, the main avian glucocorticoid, in free-living female tree swallows (Tachycineta bicolor) for one to two weeks to test its effects on immune modulation...
February 3, 2024: Hormones and Behavior
https://read.qxmd.com/read/38306878/selective-attention-towards-infants-in-nulliparous-women-across-the-menstrual-cycle
#29
JOURNAL ARTICLE
Sarah K C Holtfrerich, Esther K Diekhof
Research in women showed that testosterone is associated with decreased selective attention towards infant stimuli, which can be compensated for by oxytocin administration. In theory, caregiving behavior is thought to be mediated by oxytocin. Oxytocin binds to dopaminergic neurons and thus supposedly motivates aspects of caregiving through its influence on dopaminergic transmission. Most previous studies on caregiving behaviors were thereby performed in women under hormonal contraception to avoid hormonal fluctuations...
February 1, 2024: Hormones and Behavior
https://read.qxmd.com/read/38306877/a-hamster-model-for-stress-induced-weight-gain
#30
JOURNAL ARTICLE
Kevin M Moran, Yvon Delville
This review addresses the translational relevance of animal models of stress and their effects on body weight. In humans, stress, whether chronic or acute, has often been associated with increased food intake and weight gain. In view of the current obesity epidemic, this phenomenon is especially relevant. Such observations contrast with reports with commonly used laboratory animals, especially rats and mice. In these species, it is common to find individuals gaining less weight under stress, even with potent social stressors...
February 1, 2024: Hormones and Behavior
https://read.qxmd.com/read/38295731/social-environment-and-anogenital-distance-length-phenotype-interact-to-explain-testosterone-levels-in-a-communally-rearing-rodent-part-2-the-female-side
#31
JOURNAL ARTICLE
Loreto A Correa, Antonia Aspillaga-Cid, Cecilia León, Carolyn M Bauer, Juan Ramírez-Estrada, Loren D Hayes, Mauricio Soto-Gamboa, Luis A Ebensperger
Testosterone is known as a "male" hormone; however, females also synthetize testosterone, which influences female sexual and aggressive behavior. In female vertebrates, as in males, testosterone levels can vary seasonally. However, female testosterone levels may also be related with female anogenital distance (AGD) length phenotype (a proxy of prenatal androgen exposure), and the social group environment. We used data from a long-term rodent study (2009-2019) in a natural population of degus (Octodon degus) to examine the potential associations between female serum testosterone levels, season, female AGD phenotype, and social group composition...
January 30, 2024: Hormones and Behavior
https://read.qxmd.com/read/38281444/leveraging-the-unique-social-organization-of-california-mice-to-study-circuit-specific-effects-of-oxytocin-on-behavior
#32
JOURNAL ARTICLE
Alyssa A Lake, Brian C Trainor
Oxytocin is a versatile neuropeptide that modulates many different forms of social behavior. Recent hypotheses pose that oxytocin enhances the salience of rewarding and aversive social experiences, and the field has been working to identify mechanisms that allow oxytocin to have diverse effects on behavior. Here we review studies conducted on the California mouse (Peromyscus californicus) that shed light on how oxytocin modulates social behavior following stressful experiences. In this species, both males and females exhibit high levels of aggression, which has facilitated the study of how social stress impacts both sexes...
January 27, 2024: Hormones and Behavior
https://read.qxmd.com/read/38278061/from-pathology-to-pleasure-reframing-mechanistic-studies-on-same-sex-sexual-behavior-in-primates
#33
JOURNAL ARTICLE
Evan Cunningham, Marcela E Benítez
Same-sex sexual behaviors (SSB) in primates have historically been studied as sexual perversions, evolutionary paradoxes, and hormone-driven pathologies. Researchers in recent decades have challenged these perspectives, yet some of the original biases still linger. In this paper, we examine how the study of endocrinological mechanisms in SSB has been influenced by the historical framework of pathology. Societal attitudes and cultural conceptions of human sexuality have led researchers to study SSB in primates as the outcome of "abnormal" processes of "feminization" or "masculinization" of sexual behavior...
January 25, 2024: Hormones and Behavior
https://read.qxmd.com/read/38278060/social-environment-and-anogenital-distance-length-phenotype-interact-to-explain-testosterone-levels-in-a-communally-rearing-rodent-part-1-the-male-side
#34
JOURNAL ARTICLE
Loreto A Correa, Antonia Aspillaga-Cid, Carolyn M Bauer, Danna Silva-Álvarez, Cecilia León, Juan Ramírez-Estrada, Mauricio Soto-Gamboa, Loren D Hayes, Luis A Ebensperger
In vertebrates, male testosterone levels vary across the year being generally higher during the mating season relative to the offspring rearing season. However, male testosterone levels may also be associated with male anogenital distance (AGD) length (a proxy of prenatal androgen exposition), and influenced by the social group environment. In social species, it has been proposed that high levels of testosterone could be incompatible with the development of an amicable social environment. Thus, in these species, it is predicted that males have relatively low levels of testosterone...
January 25, 2024: Hormones and Behavior
https://read.qxmd.com/read/38245919/in-your-cort-corticosterone-and-its-receptors-in-the-brain-underlie-mate-choosiness-in-female-cope-s-gray-treefrogs-hyla-chrysoscelis
#35
JOURNAL ARTICLE
Mariana Rodriguez-Santiago, Annika Ruppert, Megan D Gall, Kim Hoke, Mark A Bee, Alexander T Baugh
Selecting an attractive mate can involve trade-offs related to investment in sampling effort. Glucocorticoids like corticosterone (CORT) are involved in resolving energetic trade-offs. However, CORT is rarely studied in the context of mate choice, despite its elevated levels during reproductive readiness and the energetic transitions that characterize reproduction. Few systems are as well suited as anuran amphibians to evaluate how females resolve energetic trade-offs during mate choice. Phonotaxis tests provide a robust bioassay of mate choice that permit the precise measurement of inter-individual variation in traits such as choosiness-the willingness to pursue the most attractive mate despite costs...
January 20, 2024: Hormones and Behavior
https://read.qxmd.com/read/38241961/early-life-adversity-accelerates-hypothalamic-drive-of-pubertal-timing-in-female-rats-with-associated-enhanced-acoustic-startle
#36
JOURNAL ARTICLE
Lauren Granata, Michaela Fanikos, Heather C Brenhouse
Early life adversity in the form of childhood maltreatment in humans or as modeled by maternal separation (MS) in rodents is often associated with an earlier emergence of puberty in females. Earlier pubertal initiation is an example of accelerated biological aging and predicts later risk for anxiety in women, especially in populations exposed to early life trauma. Here we investigated external pubertal markers as well as hypothalamic gene expression of pubertal regulators kisspeptin and gonadotropin-releasing hormone, to determine a biological substrate for MS-induced accelerated puberty...
January 18, 2024: Hormones and Behavior
https://read.qxmd.com/read/38194858/hair-cortisol-and-dehydroepiandrosterone-and-their-associations-with-optimism-and-pessimism-in-older-people
#37
JOURNAL ARTICLE
Mariola Zapater-Fajarí, Isabel Crespo-Sanmiguel, Teresa Montoliu, Vanesa Hidalgo, Alicia Salvador
The cumulative negative effects of prolonged Hypothalamic-Pituitary-Adrenal axis (HPA axis) activation are associated with several age-related diseases. Some psychological traits such as optimism and pessimism have been shown to be related to both health and the stress response, although their relationship with the HPA axis is inconclusive. More stable HPA axis biomarkers, such as hair samples of cortisol (HC) and dehydroepiandrosterone (HDHEA), would help to clarify the association between these psychological traits and HPA axis functioning...
January 8, 2024: Hormones and Behavior
https://read.qxmd.com/read/38190769/gender-minority-stress-and-diurnal-cortisol-profiles-among-transgender-and-gender-diverse-people-in-the-united-states
#38
JOURNAL ARTICLE
L Zachary DuBois, Jae A Puckett, Dee Jolly, Sally Powers, Tian Walker, Debra A Hope, Richard Mocarski, T Zachary Huit, Brenna R Lash, Natalie Holt, Allura Ralston, Makinna Miles, A Capannola, Clove Tipton, Geeta Eick, Robert-Paul Juster
The field of behavioral neuroendocrinology has only begun to explore the lived experiences of transgender and gender diverse (TGD) people exposed to stigma. In light of escalating attacks and legislation targeting TGD people in the United States, it is crucial to examine the physiological pathways through which gender minority stressors become embodied, impact health, and contribute to health inequities. The Trans Resilience and Health Study included baseline data collection from fall 2019 to spring 2020 from a sample of 124 TGD people, reflecting a diversity of gender identities (e...
January 7, 2024: Hormones and Behavior
https://read.qxmd.com/read/38154435/androgen-receptors-rapidly-modulate-non-breeding-aggression-in-male-and-female-weakly-electric-fish-gymnotus-omarorum
#39
JOURNAL ARTICLE
Guillermo Valiño, Kent Dunlap, Laura Quintana
The South American weakly electric fish, Gymnotus omarorum, displays territorial aggression year-round in both sexes. To examine the role of rapid androgen modulation in non-breeding aggression, we administered acetate cyproterone (CPA), a potent inhibitor of androgen receptors, to both male and females, just before staged agonistic interactions. Wild-caught fish were injected with CPA and, 30 min later, paired in intrasexual dyads. We then recorded the agonistic behavior which encompasses both locomotor displays and emission of social electric signals...
December 27, 2023: Hormones and Behavior
https://read.qxmd.com/read/38141539/thyroid-hormones-mediate-the-impact-of-early-life-stress-on-ventral-tegmental-area-gene-expression-and-behavior
#40
JOURNAL ARTICLE
Shannon N Bennett, Austin B Chang, Forrest D Rogers, Parker Jones, Catherine Jensen Peña
Proper thyroid function is essential to the developing brain, including dopamine neuron differentiation, growth, and maintenance. Stress across the lifespan impacts thyroid hormone signaling and anxiety disorders and depression have been associated with thyroid dysfunction (both hypo- and hyper-active). However, less is known about how stress during postnatal development impacts thyroid function and related brain development. Our previous work in mice demonstrated that early-life stress (ELS) transiently impinged on expression of a transcription factor in dopamine neurons, Otx2, shown to be regulated by thyroid hormones...
December 22, 2023: Hormones and Behavior
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