MON-018 Fertility Rates in Rats Characterized by Increased Hypothalamic CRH Secretion

Abstract Certain strains of rats are characterized by hyperactive Hypothalamic-Pituitary-Adrenal axis responses to stress, increased hypothalamic Corticotropin-Releasing Hormone (CRH) production and decreased fertility rates. Activation of the HPA-axis and CRH secretion has been associated with suppression of the Hypothalamic-Pituitary-Ovarian axis primarily as a result of glucocorticoids. Here we examined the hypothesis that Fischer rats have decreased fertility rates because of hypothalamic CRH hypersecretion. Antalarmin, a CRH receptor type 1 antagonist, is known to suppress adrenocorticotropin hormone secretion and other CRH receptor type 1-mediated responses. Adult female Fischer rats were injected with antalarmin or placebo, twice a day, for 16 days. Mating was evidenced by the presence of spermatozoa in the vaginal smear performed every morning. After 16 days, 20% of rats (20%) treated with placebo became pregnant and 55% rats treated with antalarmin became pregnant. We have previously reported that administration of antalarmin after the first day of pregnancy does not affect blastocyst implantation in Fischer rats. Our data suggest that antalarmin improves fertility rates in Fischer rats by antagonizing the direct antireproductive role of hypothalamic CRH.

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Dissecting the role of Corticotropin-releasing hormone receptor type 1 in Alzheimer's Disease

Pharmacopsychiatry ◽

10.1055/s-0031-1292513 ◽

2011 ◽

Vol 44 (06) ◽

Author(s):

K Lerche ◽

M Willem ◽

K Kleinknecht ◽

C Romberg ◽

U Konietzko ◽

...

Keyword(s):

Alzheimer’S Disease ◽

Alzheimer's Disease ◽

Hormone Receptor ◽

Receptor Type ◽

Corticotropin Releasing Hormone ◽

Releasing Hormone

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Regulation des Angstverhaltens — zur Rolle neuronaler Netzwerke

BIOspektrum ◽

10.1007/s12268-019-0226-8 ◽

2019 ◽

Vol 25 (7) ◽

pp. 711-714

Author(s):

Nina Dedic ◽

Jan M. Deussing

Keyword(s):

Stress Response ◽

Ventral Tegmental Area ◽

Long Range ◽

Dopamine Release ◽

Receptor Type ◽

Projection Neurons ◽

Neuronal Circuit ◽

Brain Reward ◽

Crh Receptor Type 1

AbstractThe corticotropin-releasing hormone (CRH) system orchestrates the organism’s stress response including the regulation of adaptive be haviours. Here we describe a novel neuronal circuit, which acts anxiety suppressing and positively modulates dopamine release. This anxiolytic circuit comprises inhibitory CRH-expressing, long-range projection neurons within the extended amygdala. These neurons innervate the ventral tegmental area, a prominent brain reward center that expresses high levels of CRH receptor type 1.

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Longitudinal Expression of Testicular TAS1R3 from Prepuberty to Sexual Maturity in Congjiang Xiang Pigs

Animals ◽

10.3390/ani11020437 ◽

2021 ◽

Vol 11 (2) ◽

pp. 437

Author(s):

Ting Gong ◽

Weiyong Wang ◽

Houqiang Xu ◽

Yi Yang ◽

Xiang Chen ◽

...

Keyword(s):

Sexual Maturity ◽

Cell Function ◽

Expression Patterns ◽

Taste Receptor ◽

Receptor Type ◽

Mrna Levels ◽

Early Puberty ◽

Specific Expression

Testicular expression of taste receptor type 1 subunit 3 (T1R3), a sweet/umami taste receptor, has been implicated in spermatogenesis and steroidogenesis in mice. We explored the role of testicular T1R3 in porcine postnatal development using the Congjiang Xiang pig, a rare Chinese miniature pig breed. Based on testicular weights, morphology, and testosterone levels, four key developmental stages were identified in the pig at postnatal days 15–180 (prepuberty: 30 day; early puberty: 60 day; late puberty: 90 day; sexual maturity: 120 day). During development, testicular T1R3 exhibited stage-dependent and cell-specific expression patterns. In particular, T1R3 levels increased significantly from prepuberty to puberty (p < 0.05), and expression remained high until sexual maturity (p < 0.05), similar to results for phospholipase Cβ2 (PLCβ2). The strong expressions of T1R3/PLCβ2 were observed at the cytoplasm of elongating/elongated spermatids and Leydig cells. In the eight-stage cycle of the seminiferous epithelium in pigs, T1R3/PLCβ2 levels were higher in the spermatogenic epithelium at stages II–VI than at the other stages, and the strong expressions were detected in elongating/elongated spermatids and residual bodies. The message RNA (mRNA) levels of taste receptor type 1 subunit 1 (T1R1) in the testis showed a similar trend to levels of T1R3. These data indicate a possible role of T1R3 in the regulation of spermatid differentiation and Leydig cell function.

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Role of cannabinoid receptor type 1 in rostral ventrolateral medulla in high-fat diet-induced hypertension in rats

Journal of Hypertension ◽

10.1097/hjh.0000000000001621 ◽

2018 ◽

Vol 36 (4) ◽

pp. 801-808 ◽

Cited By ~ 1

Author(s):

Guo-Qi Li ◽

Zhe Wang ◽

Tong Zhao ◽

Shi-Xuan Dai ◽

Jia-Ming Liu ◽

...

Keyword(s):

High Fat Diet ◽

Cannabinoid Receptor ◽

Rostral Ventrolateral Medulla ◽

Receptor Type ◽

Ventrolateral Medulla ◽

High Fat ◽

Cannabinoid Receptor Type 1 ◽

Induced Hypertension

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The Potential Role of a Corticotropin-Releasing Factor Receptor-1 Antagonist in Psychiatric Disorders

CNS Spectrums ◽

10.1017/s1092852900016709 ◽

2008 ◽

Vol 13 (6) ◽

pp. 467-483 ◽

Cited By ~ 13

Author(s):

Stephen M. Stahl ◽

Dana D. Wise

Keyword(s):

Stress Response ◽

Psychiatric Disorders ◽

Stress Responses ◽

Potential Role ◽

Corticotropin Releasing Factor ◽

Recovering Alcoholic ◽

Mood And Cognition ◽

Pituitary Adrenal Axis

The hypothalamic-pituitary-adrenal axis is a key mediator of the stress response in humans. The corticotropin-releasing factor (CRF) type 1 receptor (CRFR-1) in the pituitary gland is a gatekeeper for that response, and the CRFR-1 receptor is also present in many other mood- and cognition-related neural structures. Behaviorally, a number of relationships between stress and psychiatric disorders can be observed: chronic or repeated stress is associated with onset of depression; stressors can cause a recovering alcoholic to relapse; overactive stress responses mark many anxiety disorders; and insomnia can arise from an overactive stress response. Thus, a CRFR-1 antagonist could be useful for treating or preventing the consequences of CRF-mediated stress in depression, anxiety, insomnia, and substance abuse.

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