What is the clinical evidence from this study?

Study design: Other. Population: Rabbit skeletal muscle physiology.

What question did this study set out to answer?

To characterize the mRNA and protein expression of fast myosin heavy chain isoforms across various rabbit skeletal muscles.

January 1, 1993European Journal of BiochemistryOpen Access

Fast myosin heavy chain diversity in skeletal muscles of the rabbit: heavy chain IId, not IIb predominates

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Key result

In rabbit skeletal muscles, the HCIId isoform is the predominating fast myosin heavy chain isoform, unlike in rats and mice where HCIIb predominates.

Population

Rabbit skeletal muscles

Design

Preclinical

Authors

SAS. AignerETH Zurich BGBärbel GohlschUniversity of Konstanz NHNina HämäläinenInstitut für Lungenforschung

Discussion

Member takes

Implication

Species differences in myosin isoforms caution against rodent model extrapolation; leaves open questions on comparative muscle biology.

Key Points

To characterize the mRNA and protein expression of fast myosin heavy chain isoforms across various rabbit skeletal muscles.
Assessed mRNA expression using S1-nuclease mapping with a cDNA probe specific for myosin heavy chain IIa.
Separated and identified myosin heavy chain protein isoforms in whole muscle tissue and single fibers using gradient polyacrylamide gel electrophoresis.
Identified myosin heavy chain IId as the predominant fast isoform in rabbit skeletal muscles, while heavy chain IIb expression was restricted to a small subset of muscles including the adductor magnus and gastrocnemius.
Identified pure fiber types (IIB, IID, IIA) as well as abundant hybrid fibers coexpressing multiple isoforms in diverse ratios, demonstrating a progressive spectrum of fiber-type transitions from slow type I to fast type IIB.

Structured PICO

Population

Rabbit skeletal muscles (including adductor magnus, gastrocnemius, latissimus dorsi, vastus lateralis, extensor digitorum longus, tibialis anterior, and psoas)

Intervention

Analysis of myosin heavy chain (HC) composition at mRNA (S1-nuclease mapping) and protein (gradient PAGE) levels

Outcome

Myosin heavy chain isoform compositionsurrogate

HCIId, rather than HCIIb, is the predominant fast myosin heavy chain isoform in rabbit skeletal muscles, highlighting species-specific differences in muscle fiber composition.

Cite This Study

Aigner et al. (1993) studied Rabbit skeletal muscle physiology. In rabbit skeletal muscles, the HCIId isoform is the predominating fast myosin heavy chain isoform, unlike in rats and mice where HCIIb predominates.

synapsesocial.com/papers/6a08db3073760a4edcd60422 https://doi.org/10.1111/j.1432-1033.1993.tb19906.x

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Fast myosin heavy chain diversity in skeletal muscles of the rabbit: heavy chain IId, not IIb predominates

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Fast myosin heavy chain diversity in skeletal muscles of the rabbit: heavy chain IId, not IIb predominates

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Also Consider