Abstract
In the present study electrical field-induced fusion has been applied to both normal pancreatic islet cells isolated from obese hyperglycemie mice and clonal insulin-producing cells (RINmSF) derived from a transplantable rat insulinoma. The fused cells were then punctured with microelectrodes to measure changes in membrane potential after exposure to stimulatory concentrations of D-glucose or K+. Fused cells of normal islet cellular origin revealed a resting membrane potential of -60 mV and were depolarized by 24 or 27 mV after exposure to 11 mM D-glucose or 30 mM K+. Although D-glucose induced depolarization, it was not possible to establish the existence of an oscillating burst pattern superimposed by action potentials. The resting membrane potential of the fused RINm5F cells was also -60 mV and decreased to -30 mV after exposure to 30 mM K+. As judged from the membrane potential measurements, the reconstitution of the plasma membrane subsequent to electrical breakdown is essentially the same whether the giant cells originated from normal islet cells or RINm5F cells.
| Original language | English |
|---|---|
| Pages (from-to) | 367-372 |
| Number of pages | 6 |
| Journal | FEBS Letters |
| Volume | 202 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jul 7 1986 |
| Externally published | Yes |
Fingerprint
Keywords
- Electrofusion
- Insulin-producing cell
- Membrane potential
- Microelectrode
ASJC Scopus subject areas
- Biochemistry
- Biophysics
- Molecular Biology
Cite this
Microelectrode studies of D-glucose- and K+-induced changes in membrane potential of electrofused insulin-producing cells. / Berggren, Per Olof; Sohtell, Morgan.
In: FEBS Letters, Vol. 202, No. 2, 07.07.1986, p. 367-372.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Microelectrode studies of D-glucose- and K+-induced changes in membrane potential of electrofused insulin-producing cells
AU - Berggren, Per Olof
AU - Sohtell, Morgan
PY - 1986/7/7
Y1 - 1986/7/7
N2 - In the present study electrical field-induced fusion has been applied to both normal pancreatic islet cells isolated from obese hyperglycemie mice and clonal insulin-producing cells (RINmSF) derived from a transplantable rat insulinoma. The fused cells were then punctured with microelectrodes to measure changes in membrane potential after exposure to stimulatory concentrations of D-glucose or K+. Fused cells of normal islet cellular origin revealed a resting membrane potential of -60 mV and were depolarized by 24 or 27 mV after exposure to 11 mM D-glucose or 30 mM K+. Although D-glucose induced depolarization, it was not possible to establish the existence of an oscillating burst pattern superimposed by action potentials. The resting membrane potential of the fused RINm5F cells was also -60 mV and decreased to -30 mV after exposure to 30 mM K+. As judged from the membrane potential measurements, the reconstitution of the plasma membrane subsequent to electrical breakdown is essentially the same whether the giant cells originated from normal islet cells or RINm5F cells.
AB - In the present study electrical field-induced fusion has been applied to both normal pancreatic islet cells isolated from obese hyperglycemie mice and clonal insulin-producing cells (RINmSF) derived from a transplantable rat insulinoma. The fused cells were then punctured with microelectrodes to measure changes in membrane potential after exposure to stimulatory concentrations of D-glucose or K+. Fused cells of normal islet cellular origin revealed a resting membrane potential of -60 mV and were depolarized by 24 or 27 mV after exposure to 11 mM D-glucose or 30 mM K+. Although D-glucose induced depolarization, it was not possible to establish the existence of an oscillating burst pattern superimposed by action potentials. The resting membrane potential of the fused RINm5F cells was also -60 mV and decreased to -30 mV after exposure to 30 mM K+. As judged from the membrane potential measurements, the reconstitution of the plasma membrane subsequent to electrical breakdown is essentially the same whether the giant cells originated from normal islet cells or RINm5F cells.
KW - Electrofusion
KW - Insulin-producing cell
KW - Membrane potential
KW - Microelectrode
UR - http://www.scopus.com/inward/record.url?scp=0022526453&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0022526453&partnerID=8YFLogxK
U2 - 10.1016/0014-5793(86)80720-7
DO - 10.1016/0014-5793(86)80720-7
M3 - Article
C2 - 3522277
AN - SCOPUS:0022526453
VL - 202
SP - 367
EP - 372
JO - FEBS Letters
JF - FEBS Letters
SN - 0014-5793
IS - 2
ER -