Short photoperiod and testosterone-induced modification of GnRH release from the hypothalamus of Peromyscus maniculatus.

Short photoperiod and testosterone-induced modification of GnRH release from the hypothalamus of Peromyscus maniculatus. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Short photoperiod and testosterone-induced modification of GnRH release from the hypothalamus of Peromyscus maniculatus. Abstract Text:

Eric M Mintz,Kim R Lavenburg,James L Blank,Eric M Mintz,Kim R Lavenburg,James L Blank,Eric M Mintz,Kim R Lavenburg,James L Blank,

Seasonally breeding animals undergo numerous physiological changes in response to changes in the length of the photoperiod. In most warm-weather breeding rodents, these changes result in reproductive quiescence during short photoperiods. It has been hypothesized that this change is mediated by changes in the activity of gonadotropin-releasing (GnRH) hormone neurons of the hypothalamus. This study was designed to test whether there are changes in the releasable pool of GnRH in the hypothalamus in response to changes in photoperiod, the presence of gonadal steroids, or the responsiveness of the individual animal to photoperiodic changes. Male deer mice (Peromyscus maniculatus) were maintained on long or short day photoperiod and either left intact, castrated, or castrated with testosterone replacement. KCl-evoked GnRH release was measured from hypothalamic explants from each animal and compared between long and short days, between castrated, intact, and castrated with testosterone replacement animals, and between animals that did or did not show gonadal regression in response to short day treatment. There was a significant decline in evoked release of GnRH in short day housed animals when comparing photoperiod responsive mice to nonresponsive mice. In addition, both reproductively nonresponsive and long day-housed mice release less GnRH following castration than their intact counterparts. When castrated long day-housed mice were provided with long day levels of testosterone, evoked GnRH release was restored to intact levels. Taken together, the results of this study suggest that variation in testicular response to short days is most likely due to differences in the release of GnRH from the hypothalamus.

Short photoperiod and testosterone-induced modification of GnRH release from the hypothalamus of Peromyscus maniculatus. Publishing Authors By Initials

EM Mintz,KR Lavenburg,JL Blank,EM Mintz,KR Lavenburg,JL Blank,EM Mintz,KR Lavenburg,JL Blank,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Short photoperiod and testosterone-induced modification of GnRH release from the hypothalamus of Peromyscus maniculatus. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Brain research

VOLUME: 1180

Page Numbers: 20-8

Journal Abbreviation: Brain Res.

ISSN: 0006-8993

DAY: 16

MONTH: 09

YEAR: 2007

Short photoperiod and testosterone-induced modification of GnRH release from the hypothalamus of Peromyscus maniculatus. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 45503

Short photoperiod and testosterone-induced modification of GnRH release from the hypothalamus of Peromyscus maniculatus. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Short photoperiod and testosterone-induced modification of GnRH release from the hypothalamus of Peromyscus maniculatus. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Short photoperiod and testosterone-induced modification of GnRH release from the hypothalamus of Peromyscus maniculatus.

AFFILIATION: Department of Biological Sciences, Kent State University, Kent, OH 44242, USA. emintz@kent.edu

Country: Netherlands

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: Brain Res

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Short photoperiod and testosterone-induced modification of GnRH release from the hypothalamus of Peromyscus maniculatus Related Publications

• A microanatomical study of the response of the pilosebaceous apparatus of the rabbits ear canal.
• A rapid imbedding technic for histologic sections employing a water soluble wax.
• Alertness management in 24/7 settings: lessons from aviation.
• An epidemiological study of headache in Florianopolis, Brazil.
• Assessment of the venous pump function by simultaneous phlebodynamometry, light-reflexion-rheography and infrared-photoplethysmography: a statistical comparison.
• Cardiac Performance in Tuna: 167: 8:40 AM-9:10 AM.
• Concentrated dyes as a source of two-dimensional fluorescent field for characterization of a confocal microscope.
• Contact dermatitis from 4-tertiary butyl catechol in Thermo-Fax paper; report of a case.
• Digital signal processing of the wideband external pulse recorded during cuff deflation: a new way to measure blood pressure.
• Endoplasmic reticulum association and N-linked glycosylation of the human Nrf3 transcription factor.
• Following the solvent directly during ultrafast excited state proton transfer.
• Formation of furan and methylfuran from ascorbic acid in model systems and food.
• Growth performance, gastrointestinal microbial activity, and nutrient digestibility in early-weaned pigs fed diets containing flaxseed and carbohydrase enzyme.
• Identification of interleukin-1{beta} regulated genes in uterine smooth muscle cells.
• In vitro fungistatic action of phenanthrolines against pathogenic fungi.
• Increased Young's modulus and hardness of Col1a2oim dentin.
• Isolation of herpes simplex virus on the chorioallantoic membrane.
• MRI Assessment of Articular Cartilage Thickness in Patients Undergoing Unicondylar Knee Arthroplasty: 1160: June 2 9:20 AM - 9:40 AM.
• Medical vial stopper for insuring sterile needle punctures. No. 2,459,304.
• Nemaline myopathy and a mitochondrial neuromuscular disorder in one family.
• Photoionization of isooctane and n-octane in intense laser fields. I. Effect of irradiance on ionization rates.
• Predictors of delayed return to work or job loss with respiratory ill-health: a systematic review.
• Pulmonary cripples.
• Safety aspects of pulsed dose rate brachytherapy: analysis of errors in 1,300 treatment sessions.
• Short photoperiod and testosterone-induced modification of GnRH release from the hypothalamus of Peromyscus maniculatus.
• Transcriptional regulation of intronic calcium-activated potassium channel SK2 promoters by nuclear factor-kappa B and glucocorticoids.
• Use of video conferencing for psychiatric and forensic evaluations.
• [New aspects of the pathogenesis of systemic lupus erythematosus]
• [Not Available.]
• [Self-rated health among industrial workers in Southern Brazil.]