Related Experiment Video
Updated: Jun 19, 2026
06:37
Immunolabelling Myofiber Degeneration in Muscle Biopsies
Published on: December 5, 2019
THE PATHOGENESIS OF WAXY DEGENERATION OF STRIATED MUSCLES (ZENKER'S DEGENERATION)
1Pathological Laboratory of the University of Chicago.
The Journal of Experimental Medicine
|October 30, 2009
Summary
Waxy degeneration in muscles is likely caused by lactic acid produced by bacteria or toxins. Accumulation of lactic acid, potentially worsened by poor circulation, leads to muscle cell changes resembling Zenker
Area of Science:
- Muscle pathology
- Biochemistry
- Microbiology
Background:
- Waxy or hyaline degeneration affects striated muscle cells.
- Previous studies suggested various causes for muscle degeneration.
- The role of lactic acid in this process was not fully understood.
Purpose of the Study:
- To investigate the role of lactic acid in the development of waxy degeneration in muscles.
- To differentiate lactic acid-induced degeneration from other forms of muscle necrosis.
Main Methods:
- Experimental induction of waxy degeneration using lactic acid in vitro and in vivo.
- Comparative analysis of muscle tissue changes.
- Examination of muscles stimulated to exhaustion to observe endogenous lactic acid effects.
Main Results:
- Lactic acid, even in dilute concentrations, induced waxy transformation in muscle fibers.
- Other conditions like anemic necrosis or bacterial action did not cause similar changes.
- Muscles fatigued to exhaustion exhibited microscopic changes identical to Zenker's waxy degeneration.
Conclusions:
- Lactic acid is a primary factor in the production of waxy degeneration in muscles.
- Bacterial toxins or infection can stimulate lactic acid production, leading to muscle degeneration.
- Defective circulation may exacerbate lactic acid accumulation and subsequent muscle damage.
Related Concept Videos
01:22Myasthenia Gravis ll: Pathophysiology
The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...
01:28Disorders of the Skeletal Muscle
The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
01:26Cross-bridge Cycle
As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
01:21Satellite Stem Cells and Muscular Dystrophy
Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...