Key result
Heterotopic transplantation-induced atrophy impairs rat heart relaxation and decreases SR Ca2+ uptake.
Why the study?
The mechanisms underlying impaired relaxation and Ca2+ transport in atrophic transplanted hearts performing minimal external work were not well understood.
Does heterotopic isotransplantation and subsequent atrophy alter muscle mechanics and Ca2+ transport in rat hearts compared to fully loaded host hearts?
Population
Rat hearts heterotopically isotransplanted for 8 weeks undergoing atrophy
Comparison
Transplanted atrophic hearts vs recipient host hearts with full hemodynamic load
Design
Preclinical experimental study
Follow-up
8 weeks
Authors
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Impaired relaxation in atrophic rat hearts may stem from reduced SR Ca2+ uptake; hypothesis-generating for mechanisms of human cardiac unloading.
Does heterotopic isotransplantation and subsequent atrophy alter muscle mechanics and Ca2+ transport in rat hearts compared to fully loaded host hearts?
Atrophic transplanted rat hearts demonstrate impaired relaxation and depressed sarcoplasmic reticulum Ca2+ uptake, providing a mechanistic basis for contractile dysfunction in unloaded hearts.
Korecký et al. (1986) studied Atrophic heart transplants. Heterotopic isotransplantation (atrophic heart) vs. Hearts of recipient animals carrying full hemodynamic load was evaluated on Isometric contractile activity, force-frequency relationship, and Ca2+ transport. Heterotopically isotransplanted rat hearts undergoing atrophy showed impaired relaxation at higher stimulation frequencies and calcium levels, alongside a significant decrease in SR Ca2+ uptake.
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