De células enteras de grabación de calcio activados por calcio de lanzamiento (CRAC) Las corrientes en los linfocitos T humanos
Summary
Ofrecemos un protocolo de paso a paso para la grabación de células enteras patch clamp de calcio activados por calcio de lanzamiento (CRAC) las corrientes en mononucleares de sangre periférica de células derivadas de los linfocitos T humanos.
Abstract
In T lymphocytes, depletion of Ca2+ from the intracellular Ca2+ store leads to activation of plasmalemmal Ca2+ channels, called Calcium Release-Activated Calcium (CRAC) channels. CRAC channels play important role in regulation of T cell proliferation and gene expression. Abnormal CRAC channel function in T cells has been linked to severe combined immunodeficiency and autoimmune diseases 1, 2 . Studying CRAC channel function in human T cells may uncover new molecular mechanisms regulating normal immune responses and unravel the causes of related human diseases. Electrophysiological recordings of membrane currents provide the most accurate assessment of functional channel properties and their regulation. Electrophysiological assessment of CRAC channel currents in Jurkat T cells, a human leukemia T cell line, was first performed more than 20 years ago 3, however, CRAC current measurements in normal human T cells remains a challenging task. The difficulties in recording CRAC channel currents in normal T cells are compounded by the fact that blood-derived T lymphocytes are much smaller in size than Jurkat T cells and, therefore, the endogenous whole-cell CRAC currents are very low in amplitude. Here, we give a step-by-step procedure that we routinely use to record the Ca2+ or Na+ currents via CRAC channels in resting human T cells isolated from the peripheral blood of healthy volunteers. The method described here was adopted from the procedures used for recording the CRAC currents in Jurkat T cells and activated human T cells 4-8.
Protocol
Discussion
La investigación electrofisiológica de las corrientes de CRAC en reposo las células T humanas es una tarea difícil debido a la amplitud endógeno CRAC actual en estas células es pequeño debido al tamaño de células pequeñas (el diámetro de descanso de células T humanas está en el rango de 5.8 micras). Aquí se presenta un procedimiento paso a paso para registrar de forma fiable las corrientes CRAC en el descanso los linfocitos T humanos aislados a partir de células mononucleares de sangre periférica. Esta t…
Declarações
The authors have nothing to disclose.
Acknowledgements
Estamos agradecidos con el Departamento de Fisiología y Biología de Membrana de la Universidad de California Davis para que nos proporciona las instalaciones y un excelente ambiente para los estudios de los canales iónicos.
Materials
| Material Name | Tipo | Company | Catalogue Number | Comment |
|---|---|---|---|---|
| RosetteSep Human T Cell Enrichment Cocktail | StemCell Technologies, Vancouver, BC, Canada | 15061 | ||
| RosetteSep Density Medium | StemCell Technologies | 15705 | ||
| RPMI-in 1640 medium w/glutamine/HEPES | Fisher, Waltham, MA | SH3025501 | ||
| Fetal Calf Serum | Omega Scientific, Tarzana, CA | FB-01 | ||
| GlutaMAX-I (100X solution) | Invitrogen, Carlsbad, CA | 35050 | ||
| RPMI 1640 vitamin solution (100X) | Sigma-Aldrich | 7256 | ||
| 1640 amino acids solution (50X) | Sigma-Aldrich | R7131 | ||
| Sodium pyruvate | Sigma-Aldrich | S8636 | ||
| β-Mercaptoethanol | Sigma-Aldrich | M7522 | ||
| Inositol trisphosphate | Sigma-Aldrich | 19766 | ||
| BAPTA | Sigma-Aldrich | A4926 | ||
| Poly-L-Lysine Hydrobromide | Sigma-Aldrich | P2636 | ||
| Lanthanum Chloride | Sigma-Aldrich | 262072 | ||
| Thapsigargin | Calbiochem | 586005 | ||
| Sylgard 184 Silicon Elastomer Kit | Dow Corning, Midland, MI | 3097358-1004 | ||
| HIPEC R6101 Semiconductor Protective Coating | Dow Corning, Midland, MI | |||
| 63-500 Series High-Performance Vibration Isolation Lab Table | Technical Manufacturing, Peabody, MA | 63-540 | ||
| EPC 10 patch clamp amplifier with headstage | HEKA Instruments, Bellmore, NY | |||
| Micromanipulator | Sutter Instrument, Novato, CA | MP-285 | ||
| Olympus 1X71 Inverted microscope with 40x oil immersion objective | Olympus America, Center Valley, PA | 1X71 | ||
| Windows Computer | Dell | |||
| Pulse software | HEKA Instruments | |||
| Origin Scientific Graphing and Analysis Software | OriginLab, Northampton, MA | |||
| Patch pipette puller | Sutter Instrument | P-97 | ||
| Borosilicate glass with filament (O.D.: 1.5mm and I.D.: 1.10mm | Sutter Instrument | BF150-110-7.5 | ||
| Narashige’s Microforge | Tritech Research, Los Angeles, CA | MF-830 | ||
| Silicon O-rings | McMASTER-CARR, Santa Fe Springs, CA | 111 S70 | ||
| Coverslips 25 mm | Fisher Scientific | 12-545-102 25 mm 25CIR.-1 |
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