Key result
Replacing endogenous cardiac troponin C with the NIQD McTnC mutant in rabbit cardiomyocytes made them approximately twice as sensitive to Ca2+ compared to wild-type McTnC.
Why the study?
Does replacing endogenous cTnC with NIQD McTnC increase Ca2+ sensitivity of force generation in single, chemically skinned rabbit cardiomyocytes?
Population
Single, chemically skinned rabbit cardiomyocytes
Comparison
Replacement of endogenous cardiac troponin C… vs Replacement of endogenous cTnC with wild-type…
Design
Preclinical
Authors
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Should not change clinical practice in HF; hypothesis-generating for troponin C engineering, needs human validation.
Does replacing endogenous cTnC with NIQD McTnC increase Ca2+ sensitivity of force generation in single, chemically skinned rabbit cardiomyocytes?
Mutating specific residues in mammalian cardiac troponin C to match trout troponin C significantly increases calcium sensitivity and contractility in mammalian cardiomyocytes.
Gillis et al. (2005) studied this question. NIQD McTnC (mutant mammalian cardiac troponin C) vs. wild-type McTnC was evaluated on Ca2+ sensitivity of force generation. Replacing endogenous cardiac troponin C with the NIQD McTnC mutant in rabbit cardiomyocytes made them approximately twice as sensitive to Ca2+ compared to wild-type McTnC.
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