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1 cardiac myocytes lacking transverse tubules (t-tubules).
2 olocalization in cardiac transverse tubules (T-tubules).
3 a2+ cycling appear to be concentrated at the t-tubule.
4 iomyocyte size, and development of extensive T tubules.
5 h most exhibiting an abnormal orientation of T tubules.
6 ng voltage-gated calcium channels located in T tubules.
7 ll T-tubule systems, and averaged spacing of T-tubules.
8 invaginations of the cell membrane known as t-tubules.
9 bules (t-tubules), while NHE1 is absent from t-tubules.
10 Ca(2+) release in cardiac myocytes that lack t-tubules.
11 es but an increased presence of longitudinal T-tubules.
12 0% reduction in the contacts between jSR and T-tubules.
13 by translocation of GLUT4 to sarcolemma and T-tubules.
14 ecting delayed disappearance of insulin from t-tubules.
15 perinuclear depots and sarcolemma but not at t-tubules.
16 intracellular compartments to sarcolemma and t-tubules.
17 lar vesicles, the latter closely allied with T-tubules.
18 tercalated disks but was not detected at the t-tubules.
19 f atrial cells that were observed to contain t-tubules.
20 ed with dAmph postsynaptically and at muscle T-tubules.
21 lasmic reticulum apposing CaV1.2 channels at t-tubules.
22 ricular myocytes, LTCCs primarily cluster in T-tubules.
23 use, and fast approach for analyzing myocyte T-tubules.
24 at Ca(2+) extrusion systems are localized in T-tubules.
29 r signaling, whereas Epac2 is located at the T tubules and regulates arrhythmogenic sarcoplasmic reti
30 a profound disruption to the openings of the t tubules and the cell surface in unloaded cardiomyocyte
31 ss of the orderly disposition of transverse (T)-tubules and a decrease of their associations with the
32 out (KO) mice and investigated cardiomyocyte t-tubule and cell structure and CICR over time and follo
34 tial for stabilizing the close apposition of T-tubule and sarcoplasmic reticulum membranes to form ju
35 ractional dye fluorescence (DeltaF/F) at the t-tubule and surface membranes of in situ mouse ventricu
37 lamp showed that LTCCs distribute equally in T-tubules and crest areas of the sarcolemma, whereas, in
41 for particles </=11 nm; 2), the gaps between T-tubules and junctional sarcoplasmic reticulum (jSR), j
43 tputs the densities of transversely oriented T-tubules and longitudinally oriented T-tubules, power s
45 talized in muscle and primarily localized to T-tubules and not sarcolemma during insulin resistance.
46 ), cardiomyocytes showed progressive loss of t-tubules and remodelling of the cell surface, with prol
47 ved to be laid down in advance of developing t-tubules and similarly 'orphaned' in HF, although RyR d
49 act rat ventricular myocytes (i.e., from the T-tubules and surface sarcolemma) and in detubulated myo
50 ophilin) 2 enables close association between T-tubules and the junctional sarcoplasmic reticulum to e
51 ease in the junctional coupling area between T-tubules and the SR and an elevated expression of the N
53 urface, as in other tissues, but also within T-tubules and ultimately surrounding every mitochondrion
54 in their original position at sarcolemma or t-tubules and were locally depleted of GLUT4 by budding
55 s of the sarcolemma (surface membrane versus T-tubules) and that Ca(2+) influx through these channels
56 cle EHD1 localizes to the transverse tubule (T-tubule), and loss of EHD1 results in overgrowth of T-t
58 al basolateral membrane identity localize to T-tubules, and knockdown of AP-1gamma, required for baso
59 no longer associates with caveolin 3 in the T-tubules, and noncaveolin 3-associated calcium channels
60 olonged exposure to ET-1; 2) degeneration of T-tubules; and 3) therapies targeted at erbB2 inhibition
62 s study provides the first evidence that the T-tubules are a key site for the regulation of action po
65 ested that the structure and function of the t-tubules are more complex than previously believed; in
71 is approach is flawed because the density of T-tubules as well as non-T-tubule signals in the images
72 Cav-3 in both sarcolemmal and intracellular T-tubule-associated regions indicates the existence of m
73 ated a maintained organization of transverse T-tubules but an increased presence of longitudinal T-tu
74 ude that neuronal INa is concentrated at the t-tubules, but there is no evidence of a requirement for
76 s depolarization events occurring in failing T-tubules can trigger local Ca(2+) release, resulting in
77 internalized to basal stores with a delay in t-tubules compared with sarcolemma, probably reflecting
79 lized with ryanodine receptor 2 (RyR2) in CM T-tubules, complexed with RyR2 in human and rat heart, a
80 y counteracts the well-characterized loss of t-tubule complexity and reduced expression of anchoring
82 ata showed that the newly grown longitudinal T-tubules contained Na(+)/Ca(2+)-exchanger proximal to r
83 etween junctional sarcoplasmic reticulum and T tubules (couplons), and of junctional sarcoplasmic ret
84 cantly reduces eccentric contraction-induced t-tubule damage, inflammation, and necrosis, which resul
85 m 3-month-old KO (3mKO), there were isolated t-tubule defects and Ca(2+) transient dysynchrony withou
86 myocardial infarction) in rats resulted in a T-tubule degradation (by approximately 40%) and signific
90 ntricular myocytes of large mammals with low T-tubule density, a significant number of ryanodine rece
91 ling rat hearts and measured z-groove index, T-tubule density, and compartmentalized beta(2)AR-mediat
93 A-induced knockdown of AmpII protein reduced t-tubule density, calcium transient amplitude, and the s
95 morphology, quantified by z-groove index and T-tubule density, was normalized in reverse-remodeled he
97 and distribution at the lateral membrane and T-tubules, depending on site-specific interacting protei
98 mal skeletal muscle EC coupling, transverse (t) tubule depolarization triggers sarcoplasmic reticulum
99 addition to standard protocols would promote T-tubule development and mature excitation-contraction c
100 tion on Matrigel mattress, is sufficient for T-tubule development, enhanced Ca-induced Ca release, an
102 JP2 overexpression attenuates stress-induced T-tubule disorganization and protects against heart fail
103 arction mice was associated with progressive t-tubule disorganization, as quantified by fast-Fourier
104 e that down-regulation of JP2 contributes to T-tubule disorganization, loss of excitation-contraction
107 2+) release synchrony has been attributed to t-tubule disruption, but it is unknown if other factors
110 ammals or large mammals that have lost their t-tubules due to disease-induced structural remodeling (
112 owledge are the first direct measurements of t-tubule electrical activity in ventricular cardiomyocyt
113 ty to intracellular ryanodine receptors, the t-tubules enable synchronous Ca(2+) release throughout t
114 r platelet production and muscle transverse (T) tubules facilitate excitation:contraction coupling.
118 t led to disappearance of dAmph and impaired T-tubule formation, phenocopying amph-null mutants.
121 nly in the cell midsection, even before full T-tubule formation; the latter occurred concurrent with
122 nly in the cell midsection, even before full T-tubule formation; the latter occurred concurrent with
126 bution of the t tubules (power of the normal t-tubule frequency: UN 8.13+/-1.12x10(5), n=57 vs. C 20.
128 ysis and quantification of the remodeling of T-tubules have been a challenge and remain inconsistent
131 aracterized modulation of ICa by Ca2+ at the t-tubules (ie, in control cells) and surface sarcolemma
132 al maturation of hiPSC-CM, including lack of T-tubules, immature excitation-contraction coupling, and
135 ll membrane invaginations called transverse (T)-tubules in determining Ca influx and action potential
136 l membrane, the lateral membrane groove, and T-tubules in cardiomyocytes from wild-type (N=3), dystro
137 lar structural parallels; disorganization of t-tubules in failing cells was strikingly reminiscent of
140 diating the normally tight regulation of the t-tubules in response to load variation are poorly under
143 tation-contraction coupling, the role of the t-tubules in such arrhythmogenesis has not previously be
144 with adult human ventricular cardiomyocytes, T-tubules in T3+Dex-treated hiPSC-CM were less organized
145 nal membrane at the cell surface than in the T-tubules (in nM/microm(2): 1.43 vs. 1.06 during a cardi
146 Osmotic shock, which selectively eliminates T-tubules, induced a greater reduction in L- versus TTCC
148 regularity of T-tubules to give an index of T-tubule integrity (TTint), which provides a global eval
151 that the action potential at the transverse (t)-tubules is longer than at the surface membrane in mam
153 a cardiac action potential, Ca entry at the T-tubules is 2.2 times that at the cell surface (3.0 vs.
154 nctional density of NCX and Na/K pump in the t-tubules is 3-3.5-fold higher than in the external sarc
157 al muscle-specific protein that localizes to T tubules, is essential for coupling membrane depolariza
158 ation of the sarcoplasmic reticulum (SR) and T-tubule junction, leading to disruption of the SR signa
161 e model was used to ascertain how HF-induced T-tubule loss led to altered LTCC function and early aft
163 one, where there was also significantly more t-tubule loss, with a greater deterioration in t-tubule
169 and in heart failure, so that changes in the t-tubules may contribute to the functional changes obser
170 location and co-location of proteins at the t-tubules may contribute to the generation of arrhythmog
172 reduction in beta1-AR density in surface and T-tubule membrane fractions without a change in beta2-AR
174 inal transmembrane domain (TMD) and bind the T-tubule membrane through their cytosolic N-terminal reg
177 N1 or BIN1+13+17) creates transverse-tubule (t-tubule) membrane microfolds, which facilitate ion chan
178 are both localized at intercalated disc and T-tubule membranes in cardiomyocytes, and Na(v)1.5 coimm
179 ROS production occurs in the sarcolemmal and t-tubule membranes where NOX2 is located and sensitizes
180 and a significant fraction of ICaL reside in T-tubule membranes where they are transmurally regulated
181 plasmic reticulum (SR) to transverse tubule (T-tubule) membranes, generating stable membrane contact
182 that bridging integrator 1 (BIN1) organizes t-tubule microfolds and facilitates CaV1.2 delivery, we
183 allows A-bands to be imaged independently of T-tubule morphology and simultaneously with Ca(2+) indic
184 eased, as occurs in acquired cardiomyopathy, T-tubule morphology is altered, and arrhythmia can resul
187 ed heart failure, as well as preservation of T-tubule network integrity in both the left and right ve
195 a2 is preferentially expressed with beta2 in T-tubules of cardiac myocytes, forming alpha2beta2 heter
196 specific site of interest (crest, groove, or T-tubules of cardiomyocytes) and sealed to the membrane
201 simulations showed that the delivery to the T-tubule opening is highly confined to the underlying Z-
203 rlying Z-groove, and especially to the first T-tubule opening, where the concentration is approximate
204 n microscopy, we observed that Z-grooves and t-tubule openings at the cell surface appeared gradually
205 face topography including transverse-tubule (T-tubule) openings leading into a cell internal system t
207 nd MLP protein showed a further reduction in t-tubule organization and accelerated heart failure.
208 junctophilin-2 (JP-2), which is involved in T-tubule organization and formation of the T-tubule/sarc
209 yte Ca(2+) release is not only determined by t-tubule organization but also by the interplay between
210 rved that mitsugumin 29 (Mg29), an important t-tubule organizing protein in skeletal muscle, was indu
211 studies showed irregular distribution of the t tubules (power of the normal t-tubule frequency: UN 8.
212 iented T-tubules and longitudinally oriented T-tubules, power spectrum of the overall T-tubule system
217 of GLUT4 storage vesicles at sarcolemma and t-tubules rather than inducing movement of intact storag
218 potential propagation at the level of single T-tubules, recently observed in diseased cardiomyocytes.
221 e multiple molecular pathways which underpin t-tubule regulation, Telethonin (Tcap) appears to be imp
222 that beta-AR antagonists can protect against T-tubule remodeling after MI, suggesting a novel therape
223 in the joining region (mut(PG1)JPH2) caused T-tubule remodeling and dyad loss, showing that an inter
224 e hypothesized that beta-AR blockers prevent T-tubule remodeling and thereby provide therapeutic bene
226 brane dyes have boosted the discoveries that T-tubule remodeling is a significant factor contributing
230 V) 1.2 channel abundance along cardiomyocyte T-tubules, resulting in the appearance of channel 'super
232 the density of beta1-ARs in both surface and T-tubule sarcolemma (55+/-4%, n=7, P<0.001; and 45+/-10%
233 s exhibit a clustered distribution along the T-tubule sarcolemma of ventricular myocytes where nanome
235 tment overlying the M-line and distinct from T-tubules, sarcoplasmic reticulum, Golgi, endoplasmic re
236 CICR process and identify disruption of the t-tubule-sarcoplasmic reticulum interaction as a possibl
238 ause the density of T-tubules as well as non-T-tubule signals in the images influence the spectrum po
243 to provide an overview of recent studies of t-tubule structure and function in cardiac myocytes.
246 ocytochemical analysis revealed that overall T-tubule structure and localization of ryanodine recepto
247 muscle LIM protein, MLP) partially restored t-tubule structure and preserved cardiac function as mea
251 Both mechanical overload and unloading alter t-tubule structure, but the mechanisms mediating the nor
252 hronically unloaded heart result in impaired t-tubule structure, with ineffective Ca(2+) release.
254 g loss of sarcolemmal organization, aberrant T-tubule structures, and increased sensitivity to membra
263 ted T-tubules, power spectrum of the overall T-tubule systems, and averaged spacing of T-tubules.
266 functional and structural disruption of the t-tubules that is ameliorated by reducing external [Ca(2
267 ly afterdepolarisations, and how the loss of t-tubules that occurs during heart failure may alter the
268 a role in synchronizing Ca2+ release at the t-tubules; the amplitude of the Ca2+ transient and contr
272 also combined the density and regularity of T-tubules to give an index of T-tubule integrity (TTint)
273 basolateral trafficking, redirects FGF from T-tubules to surface, increasing tracheal surface ramifi
274 r canonical location in transversal tubules (T-tubules) to the non-native crest of the sarcolemma, wh
275 ux via Na(+)/Ca(2+)-exchange in longitudinal T-tubules triggers release from apposing ryanodine recep
278 spholipase C-beta 1 were co-localized within T-tubules using standard immunofluorescence techniques,
279 1-mutated fish, smaller and irregular-shaped t-tubule vesicles, as well as highly disorganized termin
280 ls gated by conformational coupling with the t-tubule voltage-sensing dihydropyridine receptors.
281 Correspondingly, GLUT4-GFP translocation to T-tubules was abolished, while translocation to sarcolem
283 ulin receptor distribution in sarcolemma and T-tubules was unaffected by denervation or high-fat feed
284 n rat atrial and sheep HF atrial cells where t-tubules were absent, junctophilin 2 had sarcomeric int
287 &80% of TTX-sensitive INa is located in the t-tubules, where it generates &1/3 of t-tubular INa.
288 occurs at distinct structures (dyads) along t-tubules, where L-type Ca channels (LCCs) appose sarcop
289 nizes as distinct clusters in the groove and T-tubules which density, distribution, and organization
290 derscored by correlative imaging of RyRs and t-tubules, which enabled quantification of dyadic and no
291 located in the plasma membrane and along the T-tubules, which mediates Ca(2)(+) entry into cardiomyoc
292 ion coupling is located predominantly at the t-tubules, which thus form a Ca(2+)-handling micro-envir
294 ,4,5 P(3) (PIP3) production was abolished in T-tubules, while PIP3 production at sarcolemma was incre
295 ), and loss of EHD1 results in overgrowth of T-tubules with excess vesicle accumulation in skeletal m
296 se GLUT4 translocation to the sarcolemma and t-tubules with similar kinetics and do not require AMPKa
297 ar vesicle depots to both the sarcolemma and t-tubules with similar kinetics, although translocation
300 dies revealed electron dense material in the t-tubules within the muscle tissue of parkin knockdown z