Effects of intracellular and extracellular concentrations of Ca2+, K+, and Cl- on the Na+-dependent Mg2+ efflux in rat ventricular myocytes
Intracellular Mg2+ concentration ([Mg2+]i) was measured in rat ventricular myocytes with the fluorescent indicator furaptra (25 degrees C). After the myocytes were loaded with Mg2+, the initial rate of decrease in [Mg2+]i (initial Delta[Mg2+]i/Deltat) was estimated upon introduction of extracellular...
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Published in | Biophysical journal Vol. 91; no. 1; pp. 244 - 254 |
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Abstract | Intracellular Mg2+ concentration ([Mg2+]i) was measured in rat ventricular myocytes with the fluorescent indicator furaptra (25 degrees C). After the myocytes were loaded with Mg2+, the initial rate of decrease in [Mg2+]i (initial Delta[Mg2+]i/Deltat) was estimated upon introduction of extracellular Na+, as an index of the rate of Na+-dependent Mg2+ efflux. The initial Delta[Mg2+]i/Deltat values with 140 mM [Na+]o were essentially unchanged by the addition of extracellular Ca2+ up to 1 mM (107.3+/-8.7% of the control value measured at 0 mM [Ca2+]o in the presence of 0.1 mM EGTA, n=5). Intracellular loading of a Ca2+ chelator, either BAPTA or dimethyl BAPTA, by incubation with its acetoxymethyl ester form (5 microM for 3.5 h) did not significantly change the initial Delta[Mg2+]i/Deltat: 115.2+/-7.5% (seven BAPTA-loaded cells) and 109.5+/-10.9% (four dimethyl BAPTA loaded cells) of the control values measured in the absence of an intracellular chelator. Extracellular and/or intracellular concentrations of K+ and Cl- were modified under constant [Na+]o (70 mM), [Ca2+]o (0 mM with 0.1 mM EGTA), and membrane potential (-13 mV with the amphotericin-B-perforated patch-clamp technique). None of the following conditions significantly changed the initial Delta[Mg2+]i/Deltat: 1), changes in [K+]o between 0 mM and 75 mM (65.6+/-5.0% (n=11) and 79.0+/-6.0% (n=8), respectively, of the control values measured at 140 mM [Na+]o without any modification of extracellular and intracellular K+ and Cl-); 2), intracellular perfusion with K+-free (Cs+-substituted) solution from the patch pipette in combination with removal of extracellular K+ (77.7+/-8.2%, n=8); and 3), extracellular and intracellular perfusion with K+-free and Cl--free solutions (71.6+/-5.1%, n=5). These results suggest that Mg2+ is transported in exchange with Na+, but not with Ca2+, K+, or Cl-, in cardiac myocytes. |
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AbstractList | Intracellular Mg
2+
concentration ([Mg
2+
]
i
) was measured in rat ventricular myocytes with the fluorescent indicator furaptra (25°C). After the myocytes were loaded with Mg
2+
, the initial rate of decrease in [Mg
2+
]
i
(initial Δ[Mg
2+
]
i
/Δ
t
) was estimated upon introduction of extracellular Na
+
, as an index of the rate of Na
+
-dependent Mg
2+
efflux. The initial Δ[Mg
2+
]
i
/Δ
t
values with 140 mM [Na
+
]
o
were essentially unchanged by the addition of extracellular Ca
2+
up to 1 mM (107.3 ± 8.7% of the control value measured at 0 mM [Ca
2+
]
o
in the presence of 0.1 mM EGTA,
n
= 5). Intracellular loading of a Ca
2+
chelator, either BAPTA or dimethyl BAPTA, by incubation with its acetoxymethyl ester form (5
μ
M for 3.5 h) did not significantly change the initial Δ[Mg
2+
]
i
/Δ
t
: 115.2 ± 7.5% (seven BAPTA-loaded cells) and 109.5 ± 10.9% (four dimethyl BAPTA loaded cells) of the control values measured in the absence of an intracellular chelator. Extracellular and/or intracellular concentrations of K
+
and Cl
−
were modified under constant [Na
+
]
o
(70 mM), [Ca
2+
]
o
(0 mM with 0.1 mM EGTA), and membrane potential (–13 mV with the amphotericin-B-perforated patch-clamp technique). None of the following conditions significantly changed the initial Δ[Mg
2+
]
i
/Δ
t
: 1), changes in [K
+
]
o
between 0 mM and 75 mM (65.6 ± 5.0% (
n
= 11) and 79.0 ± 6.0% (
n
= 8), respectively, of the control values measured at 140 mM [Na
+
]
o
without any modification of extracellular and intracellular K
+
and Cl
−
); 2), intracellular perfusion with K
+
-free (Cs
+
-substituted) solution from the patch pipette in combination with removal of extracellular K
+
(77.7 ± 8.2%,
n
= 8); and 3), extracellular and intracellular perfusion with K
+
-free and Cl
−
-free solutions (71.6 ± 5.1%,
n
= 5). These results suggest that Mg
2+
is transported in exchange with Na
+
, but not with Ca
2+
, K
+
, or Cl
−
, in cardiac myocytes. Intracellular Mg2+ concentration ([Mg2+]i) was measured in rat ventricular myocytes with the fluorescent indicator furaptra (25 degrees C). After the myocytes were loaded with Mg2+, the initial rate of decrease in [Mg2+]i (initial Delta[Mg2+]i/Deltat) was estimated upon introduction of extracellular Na+, as an index of the rate of Na+-dependent Mg2+ efflux. The initial Delta[Mg2+]i/Deltat values with 140 mM [Na+]o were essentially unchanged by the addition of extracellular Ca2+ up to 1 mM (107.3+/-8.7% of the control value measured at 0 mM [Ca2+]o in the presence of 0.1 mM EGTA, n=5). Intracellular loading of a Ca2+ chelator, either BAPTA or dimethyl BAPTA, by incubation with its acetoxymethyl ester form (5 microM for 3.5 h) did not significantly change the initial Delta[Mg2+]i/Deltat: 115.2+/-7.5% (seven BAPTA-loaded cells) and 109.5+/-10.9% (four dimethyl BAPTA loaded cells) of the control values measured in the absence of an intracellular chelator. Extracellular and/or intracellular concentrations of K+ and Cl- were modified under constant [Na+]o (70 mM), [Ca2+]o (0 mM with 0.1 mM EGTA), and membrane potential (-13 mV with the amphotericin-B-perforated patch-clamp technique). None of the following conditions significantly changed the initial Delta[Mg2+]i/Deltat: 1), changes in [K+]o between 0 mM and 75 mM (65.6+/-5.0% (n=11) and 79.0+/-6.0% (n=8), respectively, of the control values measured at 140 mM [Na+]o without any modification of extracellular and intracellular K+ and Cl-); 2), intracellular perfusion with K+-free (Cs+-substituted) solution from the patch pipette in combination with removal of extracellular K+ (77.7+/-8.2%, n=8); and 3), extracellular and intracellular perfusion with K+-free and Cl--free solutions (71.6+/-5.1%, n=5). These results suggest that Mg2+ is transported in exchange with Na+, but not with Ca2+, K+, or Cl-, in cardiac myocytes. |
Author | Konishi, Masato Tursun, Pulat Tashiro, Michiko Miyazaki, Takefumi Watanabe, Masaru |
AuthorAffiliation | Department of Physiology, Tokyo Medical University, Tokyo, Japan |
AuthorAffiliation_xml | – name: Department of Physiology, Tokyo Medical University, Tokyo, Japan |
Author_xml | – sequence: 1 givenname: Michiko surname: Tashiro fullname: Tashiro, Michiko organization: Department of Physiology, Tokyo Medical University, Tokyo, Japan – sequence: 2 givenname: Pulat surname: Tursun fullname: Tursun, Pulat – sequence: 3 givenname: Takefumi surname: Miyazaki fullname: Miyazaki, Takefumi – sequence: 4 givenname: Masaru surname: Watanabe fullname: Watanabe, Masaru – sequence: 5 givenname: Masato surname: Konishi fullname: Konishi, Masato |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/16603494$$D View this record in MEDLINE/PubMed |
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CitedBy_id | crossref_primary_10_1371_journal_pone_0073171 crossref_primary_10_1002_cptc_202000236 crossref_primary_10_14789_jmj_59_260 crossref_primary_10_5105_jse_33_175 crossref_primary_10_1038_srep09255 crossref_primary_10_1007_s12576_010_0113_z crossref_primary_10_1021_acs_analchem_0c02637 crossref_primary_10_1016_j_bpj_2009_02_013 crossref_primary_10_1016_j_bpj_2014_09_015 |
Cites_doi | 10.1085/jgp.93.6.1129 10.2170/jjphysiol.52.541 10.1113/jphysiol.1987.sp016450 10.1113/jphysiol.1984.sp015496 10.1016/S0006-3495(93)81494-2 10.1007/BF00581504 10.1073/pnas.242603999 10.1085/jgp.117.2.119 10.1146/annurev.ph.53.030191.001355 10.1529/biophysj.105.068890 10.1007/s00424-005-1501-8 10.1016/S0006-3495(93)81359-6 10.2170/jjphysiol.44.433 10.1161/01.RES.72.6.1139 10.1007/s004240000499 10.2741/rasgado 10.1006/jmcc.1996.0154 10.1016/S0006-3495(97)78916-1 10.1152/jn.2000.84.1.281 10.2170/jjphysiol.48.421 10.1529/biophysj.104.055517 10.1152/ajpcell.1994.266.4.C1112 10.1007/s00424-003-1069-0 10.1152/ajpcell.2000.279.6.C1955 10.1007/BF00233458 10.1007/s004240000384 |
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Notes | Address reprint requests to Dr. Masato Konishi, Dept. of Physiology, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo 160-8402, Japan. Tel.: 81-3-3351-6141; Fax: 81-3-5379-0658; E-mail: mkonishi@tokyo-med.ac.jp. |
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Snippet | Intracellular Mg2+ concentration ([Mg2+]i) was measured in rat ventricular myocytes with the fluorescent indicator furaptra (25 degrees C). After the myocytes... Intracellular Mg 2+ concentration ([Mg 2+ ] i ) was measured in rat ventricular myocytes with the fluorescent indicator furaptra (25°C). After the myocytes... |
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SubjectTerms | Animals Biological Transport, Active - physiology Calcium - metabolism Cell Membrane - physiology Cells, Cultured Chlorine - metabolism Extracellular Fluid - metabolism Heart Ventricles - drug effects Heart Ventricles - metabolism Intracellular Fluid - metabolism Magnesium - metabolism Male Membranes Myocytes, Cardiac - physiology Potassium - metabolism Rats Rats, Wistar Sodium - metabolism |
Title | Effects of intracellular and extracellular concentrations of Ca2+, K+, and Cl- on the Na+-dependent Mg2+ efflux in rat ventricular myocytes |
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