PMID: 6406295Apr 1, 1983Paper

Seasonal and stress related changes in plasma gonadotropins, sex steroids, and corticosterone in the bullfrog, Rana catesbeiana

General and Comparative Endocrinology
P LichtR Pang

Abstract

Studies of seasonal gonadal cycles combined with direct measurements of plasma levels of the two gonadotropins (FSH and LH), several gonadal steroids (estrogen, E; progesterone, P; testosterone, T; and 5 alpha-dihydrotestosterone, DHT), and the interrenal steroid corticosterone (B) were made in male and female bullfrogs in central California over a 5-year period (between 1976 and 1981). During the course of these studies, we discovered that levels of plasma gonadotropins and steroids are highly labile and particularly sensitive to the effects of captivity, especially in males. In animals captured and sampled repeatedly in the field over a 3-day period, hormone levels remained constant, but if held in collecting sacks, gonadotropin and gonadal steroids began to drop within 2--4 hr and usually reached "baseline" levels within 20 hr. This effect was apparent in all seasons, except occasionally in early spring when hormone levels dropped by only about half. Hormone levels were also generally depressed by the time commercially collected frogs reached local supply houses. Plasma B increased within 30 min of capture and remained high for days in captive animals. Blood samples taken from several hundred animals at the time of capture r...Continue Reading

References

Jun 26, 1975·Pflügers Archiv : European journal of physiology·M ImbertF Morel
Apr 1, 1975·Comparative Biochemistry and Physiology. A, Comparative Physiology·J J Byrne, R J White
Jan 1, 1978·General and Comparative Endocrinology·G V CallardK J Ryan
Nov 1, 1979·General and Comparative Endocrinology·F LeboulengerH Audry
Jan 1, 1979·Annual Review of Physiology·P Licht
Jun 1, 1977·General and Comparative Endocrinology·E L DanielsH Papkoff
May 1, 1976·General and Comparative Endocrinology·P Licht, D Crews
May 1, 1976·General and Comparative Endocrinology·M WadaA Gorbman
Mar 1, 1974·Biology of Reproduction·A W Schuetz
Aug 1, 1973·General and Comparative Endocrinology·Y S Palka, A Gorbman
Jan 1, 1974·Transactions of the Kansas Academy of Science·E E Schroeder
Feb 1, 1981·General and Comparative Endocrinology·J E Fortune, P C Tsang

❮ Previous
Next ❯

Citations

May 1, 1993·Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology·R E Landsman
Jun 1, 1991·In Vitro Cellular & Developmental Biology : Journal of the Tissue Culture Association·P S TsaiH A Bern
Feb 3, 2009·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Jason A Miranda, Walter Wilczynski
Mar 23, 2006·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Cinthia RosemblitNora R Ceballos
Jun 8, 2013·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·D K Hews, A J Abell Baniki
Nov 1, 1985·General and Comparative Endocrinology·F L Moore, R T Zoeller
Sep 1, 1986·General and Comparative Endocrinology·L IelaJ T Bagnara
Mar 1, 1987·Hormones and Behavior·D S Townsend, W H Moger
Jan 1, 1985·Comparative Biochemistry and Physiology. A, Comparative Physiology·R B McKinney, K R Marion
Jan 1, 1986·Comparative Biochemistry and Physiology. A, Comparative Physiology·G M Hubbard, P Licht
Jan 1, 1988·Comparative Biochemistry and Physiology. A, Comparative Physiology·B VarrialeG Chieffi
Mar 1, 1996·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·F KobayashiK N Smalley
Sep 1, 1995·Comparative Biochemistry and Physiology. Part C, Pharmacology, Toxicology & Endocrinology·S FasanoR Pierantoni
Apr 12, 2005·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Kyle W SelcerBrent D Palmer
Nov 26, 2003·General and Comparative Endocrinology·Pei San TsaiJeremy T Jones
Dec 4, 2003·General and Comparative Endocrinology·Andrew A RooneyLouis J Guillette
Mar 19, 2004·General and Comparative Endocrinology·Marcela F MedinaSilvia N Fernández
Jul 3, 2002·General and Comparative Endocrinology·L F Canosa, N R Ceballos
Aug 6, 2002·General and Comparative Endocrinology·Karen Ann Glennemeier, Robert John Denver
Sep 25, 2002·General and Comparative Endocrinology·L Michael Romero
Feb 6, 2003·General and Comparative Endocrinology·Rebecca Newcomb HomanL Michael Romero
Mar 5, 2003·Hormones and Behavior·Ignacio T Moore, Tim S Jessop
Aug 29, 2003·The Journal of Steroid Biochemistry and Molecular Biology·Luis F CanosaNora R Ceballos
Nov 14, 2003·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Pei-San TsaiJason M Cavolina
Oct 1, 2009·Integrative and Comparative Biology·Christopher J Leary
Jul 21, 2000·Proceedings. Biological Sciences·H U ReyerC Som
Mar 8, 2013·Proceedings. Biological Sciences·Jessica Middlemis MaherRobert J Denver
Jul 29, 2010·Brain, Behavior and Evolution·Erin L O'Bryant, Walter Wilczynski
Jan 12, 2005·Reproductive Biology and Endocrinology : RB&E·Pei-San TsaiKathleen B Wahr
Apr 20, 2010·Reproductive Biology and Endocrinology : RB&E·Vance L TrudeauFredrick W Schueler
Mar 2, 2010·The Journal of Experimental Biology·T B HayesM Stice

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.