Sexual dimorphism in the fibers of a “clasp” muscle of Xenopus laevis

Rubinstein, Neal A.; Erulkar, S. D.; Schneider, G. T.

doi:10.1016/0014-4886(83)90414-4

Cited by 34 publications

(28 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Testosterone treatment of castrated Xenopus laevis increased tetanus half relaxation time by 38% and increased both tetanic force and muscle cross-sectional area by more than 80% in flexor carpi radialis muscle when compared with castrated control males (Regnier and Herrera, 1993). Changes in muscle fiber type proportion can also be induced by testosterone, as has been reported for Xenopus laevis (Rubinstein et al, 1983) and suggested for Rana pipiens (Renaud, 1991).…”

Section: Muscle Mechanicssupporting

confidence: 68%

“…We found that ECR muscle mass hindlimb locomotor muscle ileofibularis (Regnier and Herrera, 1993). Testosterone treatment also increases the number of tonic fibres in coracoradialis muscle (another forelimb muscle used to clasp females) in Xenopus laevis, which could explain the seasonal prolongation in 'clasp' muscles of time to fatigue and relaxation time (Rubinstein et al, 1983).…”

Section: Introductionmentioning

confidence: 76%

“…Some forelimb muscles such as extensor carpi radialis, flexor carpi radialis, sternoradialis and abductor indicus longus that are involved in amplexus have been found to be larger in mass and cross-sectional area in male than in female frogs (Clark and Peters, 2006;Kirby, 1983;Oka et al, 1984;Peters and Aulner, 2000;Yekta and Blackburn, 1992) and to have more oxidative fibers and/or higher oxidative capacity in males than in females (Kirby, 1983;Melichna et al, 1972;Peters, 2001;Rubinstein et al, 1983) (but see Oka et al, 1984). Such differences in muscle morphology have been found to lead to higher absolute isometric force in male muscles, without a difference in isometric stress (force per cross-sectional area) between sexes in two distantly related species, Rana catesbeiana and Bufo marinus (Clark and Peters, 2006;Peters and Aulner, 2000).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sexual dimorphism of extensor carpi radialis muscle size, isometric force, relaxation rate and stamina during the breeding season of the frogRana temporariaLinnaeus 1758

Navas

James

2007

Journal of Experimental Biology

View full text Add to dashboard Cite

and length were greater (tenfold and 1.4-fold, respectively), absolute tetanic muscle force and relative tetanic force (stress) were greater (16-fold and 2.2-fold, respectively) and relaxation times were slower in males than in females. Male ECR muscles incompletely relaxed during fatigue tests and showed less fatigue than female muscles. These sex differences are likely to be beneficial to the male frogs in allowing them to produce relatively high absolute muscle forces for prolonged periods of time to hold onto their mate during amplexus.

show abstract

Section: Muscle Mechanicssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sexual dimorphism of extensor carpi radialis muscle size, isometric force, relaxation rate and stamina during the breeding season of the frogRana temporariaLinnaeus 1758

Navas

James

2007

Journal of Experimental Biology

View full text Add to dashboard Cite

show abstract

“…In certain species of teleost fish, frogs, and birds, males produce courtship sounds unique to that sex and, accordingly, the neural and muscular structures associated with sound production are larger or more numerous in the males of these species [sonic fish : Fine et al, 1984;Bass and Marchaterre, 1989;Bass, 1990;Bass and Baker, 1990; frogs: Sassoon and Kelley, 1986;Kelley et al, 1988;McClelland and Wilczynski, 1989;Boyd et al, 1999;birds: Nottebohm and Arnold, 1976;Wade and Buhlman, 2000;Schultz et al, 2001]. Physiological properties of the muscles, such as fiber type composition, enzymatic activity and/or contractile characteristics, are also sexually dimorphic in patterns consistent with the behavior [Rubinstein et al, 1983;Sassoon et al, 1987;Walsh et al, 1987;Boyd et al, 1999;Peters and Aulner, 2000;Schultz et al, 2001;Girgenrath and Marsh, 2003].…”

Section: Introductionmentioning

confidence: 99%

Fiber Type Composition of the Muscle Responsible for Throat Fan Extension in Green Anole Lizards

Rosen

O'Bryant

Swender³

et al. 2004

Brain Behav Evol

View full text Add to dashboard Cite

Throat fan (dewlap) extension is sexually dimorphic in green anole lizards (Anolis carolinensis). Males have larger dewlaps which they display more frequently than females. Correlated with the behavior, sexual dimorphisms occur in the skeletal, muscular and neural structures responsible for dewlap extension in green anoles. We used histochemical techniques to stain for myosin ATPase and succinate dehydrogenase (SDH) to determine whether sex differences also exist in fiber type composition of the ceratohyoideus, the muscle that extends the dewlap. Based on the staining pattern for the two enzymes, four fiber types were identified: fast-oxidative-glycolytic (FOG), fast-glycolytic (FG), slow-oxidative (SO), and tonic. In the ceratohyoideus of both sexes, the predominate fiber types were FOG (∼43%) and FG (∼34%). Also in both males and females, the FOG and FG fibers had approximately twice the cross-sectional area of the SO and tonic fibers. No sex differences occurred in the percentages of FOG and FG fibers. However, males had a greater percentage of tonic fibers than females, whereas females had a greater percentage of SO fibers than males. The high proportion of FOG fibers in the anole ceratohyoideus makes it similar to other relatively fatigue-resistant muscles used in movements of moderate speed and duration. Although the precise role of tonic fibers in dewlap extension is not known, the greater percentage of these fibers in the male ceratohyoideus might be required to stabilize or maintain extension of the large dewlap apparatus in males.

show abstract

“…4E and 4F), nor in the sternoradialis (Figs. 4I and 4J), an androgen-regulated muscle that participates in the male clasp reflex (Rubinstein et al, 1983). In addition, we did not detect expression of LM in tibialis anterior (Figs.…”

Section: Expression Of Lm In Adult Xenopus Laevismentioning

confidence: 61%

Sexually dimorphic expression of a laryngeal-specific, androgen-regulated myosin heavy chain gene during Xenopus laevis development

Catz

Fischer

Moschella

et al. 1992

Developmental Biology

View full text Add to dashboard Cite

Masculinization of the larynx in Xenopus laevis frogs is essential for the performance of male courtship song. During postmetamorphic (PM) development, the initially female-like phenotype of laryngeal muscle (slow and fast twitch fibers) is converted to the masculine form (entirely fast twitch) under the influence of androgenic steroids. To explore the molecular basis of androgendirected masculinization, we have isolated cDNA clones encoding portions of a new Xenopus myosin heavy chain (MHC) gene. We have detected expression of this gene only in laryngeal muscle and specifically in males. All adult male laryngeal muscle fibers express the laryngeal myosin (LM). Adult female laryngeal muscle expresses LM only in some fibers. Expression of LM during PM development was examined using Northern blots and in situ hybridization. Males express higher levels of LM than females throughout PM development and attain adult levels by PM3. In females, LM expression peaks transiently at PM2. Treatment of juvenile female frogs with the androgen dihydrotestosterone masculinizes LM expression. Thus, LM appears to be a male-specific, testosterone-regulated MHC isoform in Xenopus laevis. The LM gene will permit analysis of androgen-directed sexual differentiation in this highly sexually dimorphic tissue.

show abstract

Sexual dimorphism in the fibers of a “clasp” muscle of Xenopus laevis

Cited by 34 publications

References 14 publications

Sexual dimorphism of extensor carpi radialis muscle size, isometric force, relaxation rate and stamina during the breeding season of the frogRana temporariaLinnaeus 1758

Sexual dimorphism of extensor carpi radialis muscle size, isometric force, relaxation rate and stamina during the breeding season of the frogRana temporariaLinnaeus 1758

Fiber Type Composition of the Muscle Responsible for Throat Fan Extension in Green Anole Lizards

Sexually dimorphic expression of a laryngeal-specific, androgen-regulated myosin heavy chain gene during Xenopus laevis development

Contact Info

Product

Resources

About