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Myo-mechanical Analysis of Isolated Skeletal Muscle
Published on: February 22, 2011
Expression of adenylyl cyclase mRNAs in the denervated and in the developing mouse skeletal muscle
1Institut National de la Sante et la Recherche Medicale Unite 99, Hopital Henri Mondor, F-94010 Creteil, France.
Abstract:
Changes in the activity and in the expression of adenylyl cyclase (AC) were examined in mouse skeletal muscle after denervation and during development. Four isoforms of AC (AC2, AC6, AC7, and AC9) were detected by Northern blot analysis in gastrocnemius muscle, AC9 being the most abundant. After denervation, the levels of AC2 and AC9 mRNA decreased, whereas those of AC6 and AC7 increased. AC activity in response to several neurotransmitters was increased after denervation. During development, AC activity was high in fetus and neonate and declined in the adult; the sensitivity of AC activity to various neurotransmitters was the highest on the third postnatal day. The levels of AC6 and AC7 mRNAs were high on the third postnatal day and then decreased in adult, paralleling the decline in AC activity. All the characteristics of AC expression and activity in fetus and neonate resembled those observed in denervated adult muscle. These results indicate that changes in AC activity and AC mRNAs play an important role in the various physiopathological states of skeletal muscle, especially during muscle atrophy.
Insights
Changes in adenylyl cyclase (AC) activity and expression in mouse skeletal muscle during development and after denervation reveal significant shifts in AC isoforms, impacting muscle function and atrophy.
Area of Science:
- Molecular Biology
- Neuroscience
- Physiology
Background:
- Adenylyl cyclase (AC) plays a crucial role in cellular signaling pathways.
- Understanding AC regulation is vital for comprehending skeletal muscle physiology and pathology.
Purpose of the Study:
- To investigate the changes in adenylyl cyclase (AC) activity and expression in mouse skeletal muscle.
- To analyze these changes in response to denervation and during postnatal development.
Main Methods:
- Northern blot analysis was used to detect AC isoform mRNA levels (AC2, AC6, AC7, AC9) in gastrocnemius muscle.
- AC activity was measured in response to various neurotransmitters.
- Experiments were conducted on denervated and developing mouse skeletal muscle.
Main Results:
- AC9 mRNA was most abundant; AC2 and AC9 mRNA levels decreased post-denervation, while AC6 and AC7 increased.
- Denervation led to increased AC activity in response to neurotransmitters.
- AC activity was high in fetal/neonatal muscle, declining in adults, with peak neurotransmitter sensitivity on postnatal day 3.
- AC6 and AC7 mRNA levels mirrored AC activity during development, decreasing in adults.
Conclusions:
- Changes in AC activity and mRNA expression are critical in skeletal muscle physiopathology, particularly during muscle atrophy.
- Developmental and denervation-induced changes in AC isoforms share similarities, suggesting common regulatory mechanisms.
- These findings highlight the dynamic role of AC in skeletal muscle adaptation and disease.
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