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- W3141441830 abstract "The determination of muscle types has been ascribed to motor innervation bymany authors~([1-5])。In the attempt to further study the gene expression of skele-tal muscle,two hypotheses~([6,7][4,8])have been raised which,though differentfrom each other,are all based on the assumption that myoblasts are bipotent andthe choice of one from the two options of development is dictated by the nerve,buthis assumption is not supported by the present work which,conversely,has tobe interpreted otherwise at least in chick。The right anterior Latissimus Dorsi(slow)of 3-week-old chick is extirpated,the vacant place is either occupied by 1 mm slices of fast muscle(left posteriorLatissimus Dorsi)in the first group of animals,or occupied by slices of slow muscle(right ALD)in the second group of animals.The muscle slices are consolidated byblood clot and left waiting for the sequential events of necrosis,regeneration andre-innervation by the remaining slow nerve to happen.After 2—17 mo(mostly2—6 mo)the muscle contraction is recorded with isometric lever by stimulating theslow nerve.All regenerated muscles of the 15 animals of the first group and 14animals of the second group exhibit tetanic contractions when tetanically stimulatedbut 12 in the first group and 8 in the second group exhibit single twitch when singleshock is given.The single twitches are significantly faster in the first group thanin the second as shown in the table.Still different are the responses to high frequen-cy shocks applied to the slow nerve that the muscles grown from minced fast(firstgroup)all exhibit Wedensky inhibition as the normal PLD do,while muscles of theother group exhibit no inhibition even at 450/s as the normal ALD do.Wedenskyinhibition has been claimed to be due to changes on the post-synaptic membranerather than changes on the nerve terminal~([13]).The above result again proves itsirrelevance to nerve and that the retention of some properties of the fast musclein the newly regenerated muscle is very probably through satellite cells(presumptivemyoblast in muscle)in spite of incompatlble innervation.A previous work~([14])with histochemical observations by the present authors leads to the same conclusionthat the commitment of a muscle to be fast or slow does not necessarily take placeafter innervation.Since the tetanic contractions of the muscles of the two groupsare all like that of the ALD,the exogenous neural factor seems to be reasonably in-volved." @default.
- W3141441830 created "2021-04-13" @default.
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- W3141441830 date "1985-01-01" @default.
- W3141441830 modified "2023-09-25" @default.
- W3141441830 title "RETENTION OF SOME PROPERTIES OF FAST MUSCLE IN THE REGENERATED MUSCLE GROWN FROM FAST MUSCLE SLICES IN SPITE OF FLOW MOTOR INNERVATION IN CHICK" @default.
- W3141441830 hasPublicationYear "1985" @default.
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