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Titolo:
PLASTICITY OF MUSCLE CONTRACTILE PROPERTIES FOLLOWING TEMPERATURE-ACCLIMATION IN THE MARINE FISH MYOXOCEPHALUS-SCORPIUS
Autore:
BEDDOW TA; JOHNSTON IA;
Indirizzi:
UNIV ST ANDREWS,SCH BIOL & MED SCI,GATTY MARINE LAB ST ANDREWS KY16 8LB FIFE SCOTLAND
Titolo Testata:
Journal of Experimental Biology
fascicolo: 1, volume: 198, anno: 1995,
pagine: 193 - 201
SICI:
0022-0949(1995)198:1<193:POMCPF>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
FORCE-VELOCITY CHARACTERISTICS; MYOFIBRILLAR ATPASE ACTIVITY; CARP CYPRINUS-CARPIO; THERMAL-DEPENDENCE; SWIMMING CARP; ENVIRONMENTAL-TEMPERATURE; MYOFILAMENT OVERLAP; SARCOMERE-LENGTH; POWER OUTPUT; COMMON CARP;
Keywords:
TELEOST; SKELETAL MUSCLE; ACCLIMATIZATION; FORCE-VELOCITY RELATIONSHIP; SHORT-HORNED SCULPIN; MYOXOCEPHALUS SCORPIUS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
47
Recensione:
Indirizzi per estratti:
Citazione:
T.A. Beddow e I.A. Johnston, "PLASTICITY OF MUSCLE CONTRACTILE PROPERTIES FOLLOWING TEMPERATURE-ACCLIMATION IN THE MARINE FISH MYOXOCEPHALUS-SCORPIUS", Journal of Experimental Biology, 198(1), 1995, pp. 193-201

Abstract

Live fibre bundles were isolated from the fast myotomal muscle of short-horned sculpin (Myoxocephalus scorpius L.) and isometric contractile properties and the force-velocity (P-V) relationship determined at 5, 10 and 15 degrees C, Experiments were carried out on winter- and summer-caught sculpins and on individuals acclimated for 6-8 weeks to either 5 or 15 degrees C (12h:12h light:dark), Maximum tetanic tension (P-0) in fibres from 15 degrees C-acclimated fish increased from 125 kNm(-2) at 5 degrees C to 282 kNm(-2) at 15 degrees C (R(10)=2,3), For 5 degrees C-acclimated fish, P-0 was 139 kNm(-2) at 5 degrees C, but fell to 78 kNm(-2) at 15 degrees C, consistent with a partial failure of excitation-contraction coupling at high temperatures, Peak force at 15degrees C was increased 2.2 times following depolarisation with a high-K+ solution, but was unaffected by the addition of caffeine and/or eserine to the Ringer's solution, The results from winter- and summer-caught fish were similar to those from 5 degrees C- and 15 degrees C-acclimated sculpins respectively, In 15 degrees C- acclimated fish, the power output of muscle fibres calculated from the P-V relationship was55 W kg(-1) at 5 degrees C and 206 W kg(-1) at 15 degrees C, The P-V relationship at 5 degrees C was significantly less curved in muscle fibres from 5 degrees C- than from 15 degrees C-acclimated fish, After normalizing the curves for P-0 and V-max, it was found that the change in curvature was sufficient to produce a 40 % increase in relative power output at 5 degrees C in cold-acclimated fish, The maximum contraction speed of muscle fibres at 15 degrees C was 2,4 times higher in 15 degrees C- than in 5 degrees C-acclimated fish, It was concluded that acclimation modifies the contractile properties of fast muscle fibres at both low and high temperatures,

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Documento generato il 27/10/20 alle ore 05:16:35