Ultrastructure Study on the T System and the Subcellular Localization of Calcium in Frog Skeletal Muscle
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VIEW Open Access Muscle Spindle Function in Healthy and Diseased Muscle Stephan Kröger* and Bridgette Watkins
Kröger and Watkins Skeletal Muscle (2021) 11:3 https://doi.org/10.1186/s13395-020-00258-x REVIEW Open Access Muscle spindle function in healthy and diseased muscle Stephan Kröger* and Bridgette Watkins Abstract Almost every muscle contains muscle spindles. These delicate sensory receptors inform the central nervous system (CNS) about changes in the length of individual muscles and the speed of stretching. With this information, the CNS computes the position and movement of our extremities in space, which is a requirement for motor control, for maintaining posture and for a stable gait. Many neuromuscular diseases affect muscle spindle function contributing, among others, to an unstable gait, frequent falls and ataxic behavior in the affected patients. Nevertheless, muscle spindles are usually ignored during examination and analysis of muscle function and when designing therapeutic strategies for neuromuscular diseases. This review summarizes the development and function of muscle spindles and the changes observed under pathological conditions, in particular in the various forms of muscular dystrophies. Keywords: Mechanotransduction, Sensory physiology, Proprioception, Neuromuscular diseases, Intrafusal fibers, Muscular dystrophy In its original sense, the term proprioception refers to development of head control and walking, an early im- sensory information arising in our own musculoskeletal pairment of fine motor skills, sensory ataxia with un- system itself [1–4]. Proprioceptive information informs steady gait, increased stride-to-stride variability in force us about the contractile state and movement of muscles, and step length, an inability to maintain balance with about muscle force, heaviness, stiffness, viscosity and ef- eyes closed (Romberg’s sign), a severely reduced ability fort and, thus, is required for any coordinated move- to identify the direction of joint movements, and an ab- ment, normal gait and for the maintenance of a stable sence of tendon reflexes [6–12]. -
Tissue Engineered Myelination and the Stretch Reflex Arc Sensory Circuit: Defined Medium Ormulation,F Interface Design and Microfabrication
University of Central Florida STARS Electronic Theses and Dissertations, 2004-2019 2009 Tissue Engineered Myelination And The Stretch Reflex Arc Sensory Circuit: Defined Medium ormulation,F Interface Design And Microfabrication John Rumsey University of Central Florida Part of the Biology Commons Find similar works at: https://stars.library.ucf.edu/etd University of Central Florida Libraries http://library.ucf.edu This Doctoral Dissertation (Open Access) is brought to you for free and open access by STARS. It has been accepted for inclusion in Electronic Theses and Dissertations, 2004-2019 by an authorized administrator of STARS. For more information, please contact [email protected]. STARS Citation Rumsey, John, "Tissue Engineered Myelination And The Stretch Reflex Arc Sensory Circuit: Defined Medium Formulation, Interface Design And Microfabrication" (2009). Electronic Theses and Dissertations, 2004-2019. 3826. https://stars.library.ucf.edu/etd/3826 TISSUE ENGINEERED MYELINATION AND THE STRETCH REFLEX ARC SENSORY CIRCUIT: DEFINED MEDIUM FORMULATION, INTERFACE DESIGN AND MICROFABRICATION by JOHN WAYNE RUMSEY B.S. University of Florida, 2001 M.S. University of Central Florida, 2004 A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Burnett School of Biomedical Sciences in the College of Medicine at the University of Central Florida Orlando, Florida Fall Term 2009 Major Professor: James J. Hickman ABSTRACT The overall focus of this research project was to develop an in vitro tissue- engineered system that accurately reproduced the physiology of the sensory elements of the stretch reflex arc as well as engineer the myelination of neurons in the systems. In order to achieve this goal we hypothesized that myelinating culture systems, intrafusal muscle fibers and the sensory circuit of the stretch reflex arc could be bioengineered using serum-free medium formulations, growth substrate interface design and microfabrication technology. -
Massive Alterations of Sarcoplasmic Reticulum Free Calcium in Skeletal Muscle Fibers Lacking Calsequestrin Revealed by a Genetic
Massive alterations of sarcoplasmic reticulum free calcium in skeletal muscle fibers lacking calsequestrin revealed by a genetically encoded probe M. Canatoa,1, M. Scorzetoa,1, M. Giacomellob, F. Protasic,d, C. Reggiania,d, and G. J. M. Stienene,2 Departments of aHuman Anatomy and Physiology and bExperimental Veterinary Sciences, University of Padua, 35121 Padua, Italy; cCeSI, Department of Basic and Applied Medical Sciences, University G. d’Annunzio, I-66013 Chieti, Italy; dIIM-Interuniversity Institute of Myology and eLaboratory for Physiology, Institute for Cardiovascular Research, VU University Medical Center, 1081BT, Amsterdam, The Netherlands Edited* by Clara Franzini-Armstrong, University of Pennsylvania Medical Center, Philadelphia, PA, and approved November 12, 2010 (received for review June 30, 2010) The cytosolic free Ca2+ transients elicited by muscle fiber excitation tion essential to maintain a low metabolic rate in quiescent ex- are well characterized, but little is known about the free [Ca2+] citable cells. In addition, CSQ has been shown to modulate RyR- dynamics within the sarcoplasmic reticulum (SR). A targetable mediated Ca2+ release from the SR (6). To understand the pivotal ratiometric FRET-based calcium indicator (D1ER Cameleon) allowed role of CSQ in SR function, it is critical to determine free SR us to investigate SR Ca2+ dynamics and analyze the impact of cal- Ca2+ concentration, and this has been made possible by the ad- sequestrin (CSQ) on SR [Ca2+] in enzymatically dissociated flexor vent of a targetable ratiometric FRET-based indicator, such as digitorum brevis muscle fibers from WT and CSQ-KO mice lacking D1ER Cameleon (7). Seminal studies using this technique have isoform 1 (CSQ-KO) or both isoforms [CSQ-double KO (DKO)]. -
Localization of Ca2l Release Channels with Ryanodine in Junctional
Proc. NatI. Acad. Sci. USA Vol. 82, pp. 7256-7259, November 1985 Biochemistry Localization of Ca2l release channels with ryanodine in junctional terminal cisternae of sarcoplasmic reticulum of fast skeletal muscle (muscle contraction/excitation-contraction coupling/ruthenium red/longitudinal cisternae/gated channels) SIDNEY FLEISCHER, EUNICE M. OGUNBUNMI, MARK C. DIXON, AND EDUARD A. M. FLEER Department of Molecular Biology, Vanderbilt University, Nashville, TN 37235 Communicated by William J. Darby, July 8, 198S ABSTRACT The mechanism of Ca2' release from tional terminal cisternae consist of two types of membranes, sarcoplasmic reticulum, which triggers contraction in skeletal the Ca2l pump membrane (80-85%) and the junctional face muscle, remains the key unresolved problem in excita- membrane (15-20%) (16). A unique characteristic of junc- tion-contraction coupling. Recently, we have described the tional terminal cisternae is that they have a poor Ca2+ loading isolation of purified fractions referable to terminal and longi- rate, which can be enhanced 5-fold or more by addition of tudinal cisternae of sarcoplasmic reticulum. Junctional termi- ruthenium red (RR) (ref. 17; unpublished data). This study nal cisternae are distinct in that they have a low net energized describes the drug action of ryanodine on the junctional Ca2+ loading, which can be enhanced 5-fold or more by terminal cisternae in blocking the action of RR. It provides addition of ruthenium red. The loading rate, normalized for evidence that the action of ryanodine is on the Ca2' release calcium pump protein content, then approaches that of longi- mechanism and supports the view that Ca2' release is tudinal cisternae of sarcoplasmic reticulum. -
Be Able to Describe a Stretch Reflex
be able to describe a stretch reflex .(1) (2) Define muscle tone (3) be able to explain what is muscle tone (4) describe the structure , innervations and function of the muscle spindle . (5) explain what is meant by static and dynamic stretch reflex . (6) describe the spinal and supraspinal regulation of the stretch reflex . (7) describe the inverse stretch reflex and its function Stretch reflex: Whenever a muscle is stretched suddenly, excitation of the muscle spindle causes reflex contraction of the large muscle fiber (See the pictures). It is deep and monosynaptic reflex. Stretch response is produced by co-activation of alpha & gamma motor neurons. But it is maintained mainly by the tonic ( continuous) discharge of Gamma Efferent neurons. Muscle spindle: It is a sensory receptors which are distributed throughout the muscle and it sends information to nervous system about muscle length or rate of change in muscle length. - Each spindle is built around 3-12 intrafusal muscle fibers. - Muscle spindles are parallel to extrafusal muscle fibers and they are attached to them or to the tendon. Types of Intrafusal fibers Each intrafusal fiber consists of: (1) Central non-contractile area (receptor 2) Nuclear chain fibers: area). thinner and shorter 1) Nuclear bag fibers: than nuclear bag fibers (2) Peripheral contractile area. contain many nuclei in , and have one line of a dilated central area ( “ nuclei spread in a chain bag ” ) . Typically there along the receptor area are 2 nuclear bag fibers . There are 4 – 9 per spindle . nuclear chain -
Ultra-High Resolution Scanning Electron Microscopic Studies on the Sarcoplasmic Reticulum and Mitochondria in Various Muscles: a Review
Scanning Microscopy Volume 7 Number 1 Article 16 12-29-1992 Ultra-High Resolution Scanning Electron Microscopic Studies on the Sarcoplasmic Reticulum and Mitochondria in Various Muscles: A Review Takuro Ogata Kochi Medical School Yuichi Yamasaki Kochi Medical School Follow this and additional works at: https://digitalcommons.usu.edu/microscopy Part of the Biology Commons Recommended Citation Ogata, Takuro and Yamasaki, Yuichi (1992) "Ultra-High Resolution Scanning Electron Microscopic Studies on the Sarcoplasmic Reticulum and Mitochondria in Various Muscles: A Review," Scanning Microscopy: Vol. 7 : No. 1 , Article 16. Available at: https://digitalcommons.usu.edu/microscopy/vol7/iss1/16 This Article is brought to you for free and open access by the Western Dairy Center at DigitalCommons@USU. It has been accepted for inclusion in Scanning Microscopy by an authorized administrator of DigitalCommons@USU. For more information, please contact [email protected]. Scanning Microscopy, Vol. 7, No. 1, 1993 (Pages 145-156) 0891-7035/93$5 .00+ .00 Scanning Microscopy International, Chicago (AMF O'Hare), IL 60666 USA ULTRA-HIGH RESOLUTION SCANNING ELECTRON MICROSCOPIC STUDIES ON THE SARCOPLASMIC RETICULUM AND MITOCHONDRIA IN VARIOUS MUSCLES: A REVIEW Takuro Ogata* and Yuichi Yamasaki Department of Surgery, Kochi Medical School Nankoku, Kochi, 783 Japan (Received for publication March 23, 1992, and in revised form December 29, 1992) Abstract Introduction The three-dimensional structure of the sarco The three-dimensional models of the membrane plasm.ic -
Malak Shalfawi Noor Adnan Lina Abdelhadi Fasial Mohammad
9 Noor Adnan Malak Shalfawi Lina abdelhadi Fasial Mohammad 0 Motor system – Motor of the spinal cord Before we start talking about the motor function of the spinal cord, let’s first take a quick look at the motor system and the incredible connections taking place inside it: [please refer to the pictures for better understanding] 1- Motor command For any motor function (movement) to occur, the nervous system has motor command that comes from the cerebral motor cortex to the spinal cord and these descending tracts (corticospinal) are called also pyramidal tracts and that’s because they pass through the pyramids of medulla oblongata. The neuronal fibers coming from the cortex ending in the spinal cord are considered upper motor neurons, while the neuronal fibers going out from the spinal cord to reach the muscles are called lower motor neurons. There are other origins for the motor commands such as the brain stem and the red nucleus that send neuronal fibers to the spinal cord in order to control the activity of the muscles. 2- Motor command intension At the same time, there are some tracts going from the cortex to the cerebellum through the brain stem like the corticopontocerebellar, corticoreticulocerebellar, corticolivarycerebellar tracts. And these tracts are telling the cerebellum about the intended movements. (= the movements we want to do) 3-motor command monitor/ feedback system a- Inside the muscles we have receptors (muscle spindles/ stretch receptors, Golgi tendon organs) that are connected to sensory (afferent) neuronal fibers that goes to the spinal cord relay nuclei. 1 | P a g e b- From the spinal cord they go to the cerebellum through ventral and dorsal spinocerebellar tracts to tell the cerebellum what is exactly happening down at the level of the muscles. -
Histology of Muscle Tissue
HISTOLOGY OF MUSCLE TISSUE Dr. Sangeeta Kotrannavar Assistant Professor Dept. of Anatomy, USM-KLE IMP, Belagavi Objectives Distinguish the microscopic features of • Skeletal • Cardiac • Smooth muscles Muscle • Latin musculus =little mouse (mus) • Muscle cells are known as MYOCYTES. • Myocytes are elongated so referred as muscle fibers Fleshy • Definition • Muscle is a contractile tissue which brings about movements Tendons Muscle makes up 30-35% (in women) & 40-45% (in men) of body mass Type of muscles BASED ON BASED ON BASED ON LOCATION STRIATIONS CONTROL Skeletal / Somatic STRIATED / STRIPED VOLUNTARY Smooth / Visceral UN-STRIATED / IN-VOLUNTARY UNSTRIPED Cardiac STRIATED / STRIPED IN-VOLUNTARY SKELETAL MUSCLE Skeletal muscle organization Muscles are complex structures: arranged in fascicles Muscle bundles / fascicles • Epimysium surrounds entire muscle – Dense CT that merges with tendon – Epi = outer, Mys = muscle • Perimysium surrounds muscle fascicles – Peri = around – Within a muscle fascicle are many muscle fibers • Endomysium surrounds muscle fiber – Endo = within SKELETAL MUSCLE • Each bundles contains many muscle fiber Structure of a skeletal muscle fiber • Elongated, unbranched cylindrical fibers • Length- 1 mm – 5 cm, Width – 10 mm - 100μm • Fibers have striations of dark & light bands • Many flat nuclei beneath sarcolemma • Plasma membrane = sarcolemma • Smooth endoplsmic reticulum = sarcoplasmic reticulum (SR) • Cytoplasm = sarcoplasm • Mitochondria = sarcosomes • Each muscle fiber made of long cylindrical myofibrils Structure -
Muscle Contraction
10/19/2009 CONTROL OF MOVEMENT: STRIATED MUSCLES SKELETAL (STRIATED) MUSCLE: - each muscle = ____________________________________ - each muscle cell = _______________________________________ -Myosin: Filamentous___________________________________________ protein with cross bridges -Actin: _________________________________________________Filamentous protein where cross bridges of myosin bind ANATOMY OF SKELETAL MUSCLE ______________ _____________ ________ Extrafusal muscle fiber ________ _________ Myofibril _____________ __________________ ___________ MUSCLE CONTRACTION Watch muscle contraction movie Myosin Myosin cross bridges filament Actin filaments Actin MtfMovement of filament actin filament Myosin cross bridge Movement of myosin filament Heads of cross bridges: 1. Attach to active sites on actin filaments 2. “Ratchet” forward 3. Release 4. Repeat -Onlyoccurs in the presence of ________ How is calcium released? From___________________________ activity at neuromuscular ________junction 1 10/19/2009 NEUROMUSCULAR JUNCTION Synapse between terminal of _________________ and a ___________ is called a neuromuscular junction; Terminals of alpha motor neurons synapse on _____________- grooves along the surface of muscle fibers; When motor neuron fires, _____________ is liberated from terminals at the endplate and depolarizes muscle fibers - ________________; Depolarization of muscle fiber opens ________ _________________________, producing a large calcium influx into the fiber; Calcium triggers the actin-myosin “rowing” action leading to the -
Frog Skeletal Muscle Contraction Experiment
Frog Skeletal Muscle Contraction Experiment Is Ajai Hitlerite or cheliferous when swage some cubist daut capriciously? Martyn remains Neozoic: she herald her waterfront militates too iniquitously? Lyle remains piscatorial after Tibold disavows loud or mazes any clubbing. Curare is also known among indigenous peoples as Ampi, Woorari, Woorara, Woorali, Wourali, Wouralia, Ourare, Ourari, Urare, Urari, and Uirary. The secondå°• major difference between plant and animal cells is the cell wall. In B, note the half pillar protruding from the TC, also indicated by a line. You seem to have javascript disabled. Neurophysiology of the neuromuscular junction: overview. The influence of activity on some contractile characteristics of mammalian fast and slow muscles. What was the smallest current required to produce each of the following? Kullberg R, Owens JL. It often resolves without treatment. This electrical signal is communicated to the myofilaments inside the fibre in the following way. Connective tissue cells, fibers and intercellular medium are present in these tissues; The cells of these tissues are widely spaced and forms intercellular matrix. When the current reached the following stages, what proportion of fibers in the muscle were contracting? Most land animals, including humans, depend on angiosperms directly or indirectly for sustenance. These cells are actively mitotic, producing new cells that get pushed upward into the overlying layers. Shaded bars represent periods of strain heterogeneity. Now, gradually flex your wrist back to a straight or neutral position. Summation of twitch responses Recoding a double contraction. Since it was too expensive to be used in warfare, curare was mainly used during hunting. Tension responses to sudden length change in stimulated frog muscle fibres near slack length. -
Calcium Antagonism of the Block in Excitation-Contraction Coupling Produced by a Urea Exposure- Removal Treatment
Jap.J.Physiol.,27,215-224,1977 CALCIUM ANTAGONISM OF THE BLOCK IN EXCITATION-CONTRACTION COUPLING PRODUCED BY A UREA EXPOSURE- REMOVAL TREATMENT G.B.FRANK and R.C.TREFFERS Department of Pharmacology,The University of Alberta, Edmonton,Canada Abstract Exposing frog's toe muscles to Ringer's solution made hyper- tonic with 400mM urea for 60min followed by placing the muscles back in Ringer's(urea-removal treatment)completely blocks the twitch without disrupting the surface openings of the T-tubules.The urea-removal treatment also increased the triadic junction width.Placing the muscles in Ringer's with an elevated calcium concentration(5mM)following exposure to the hypertonic solution prevented the block of the twitch response but not the increase in the triadic junction width.Exposing untreated muscles to Ringer's with 5mM calcium either had no effect on the twitch or reduced it by 30% or less.These results suggest the possi- bility that increasing the width of the triadic junction decreases the amount of calcium ions reaching the terminal cisternae during an action potential thereby blocking the twitch.Elevating the calcium concentration in the T-tubules would increase the amount of calcium which enters the triadic junction during an action potential and thus antagonize the above effects. Several years ago it was demonstrated that the T-tubular system plays an important role in conducting the electrical activity from the surface membrane of frog's twitch skeletal muscle fibres into the interior of the fibres(HUXLEY and TAYLOR,1958).Later it was found that reexposing skeletal muscle fibres to Ringer's solution following a 1 hr exposure to Ringer's solution made hypertonic by the addition of 400mM glycerol disrupted the openings of the T-tubules to the extracellular space of the muscle and simultaneously blocked excitation-contraction (E-C)coupling(GAGE and EISENBERG,1967;HOWELLand JENDEN,1967;EISEN- BERGand EISENBERG,1968). -
Chapter 4 Calsequestrin
Chapter 4 Calsequestrin DAVID H. MacLENNAN Banting and Best Department of Medical Research C. H. Best Institute, University of Toronto Toronto, Ontario, Canada KEVIN P. CAMPBELL Department of Physiology and Biophysics University of Iowa Iowa City, Iowa and REINHART A. F. REITHMEIER Department of Biochemistry University of Alberta Edmonton, Alberta, Canada I. Sarcoplasmic Reticulum ............................................................................. 152 II. Isolated Sarcoplasmic Reticulum Vesicles ................................................. 153 III. Isolation of Calsequestrin ........................................................................... 155 IV. Ca2+ Binding by Calsequestrin ................................................................... 155 V. Size and Shape of Calsequestrin................................................................. 157 VI. Amino Acid Sequence................................................................................ 159 VII. Carbohydrate Content................................................................................. 160 VIII. Stains-All Staining...................................................................................... 160 IX. Properties of Calsequestrin in Other Muscles............................................. 161 X. Phosphorylation of Calsequestrin ............................................................... 162 XI. Localization of Calsequestrin ..................................................................... 163 XII. Biosynthesis...............................................................................................