Expression pattern of Kv11 (Ether à-go-go-related gene; erg) K+ channels in the mouse retina.
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Expression pattern of Kv11 (Ether à-go-go-related gene; erg) K+ channels in the mouse retina. / Cordeiro, Sönke; Guseva, Daria; Wulfsen, Iris; Bauer, Christiane K.
In: PLOS ONE, Vol. 6, No. 12, 12, 2011, p. 29490.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Expression pattern of Kv11 (Ether à-go-go-related gene; erg) K+ channels in the mouse retina.
AU - Cordeiro, Sönke
AU - Guseva, Daria
AU - Wulfsen, Iris
AU - Bauer, Christiane K.
PY - 2011
Y1 - 2011
N2 - In response to light, most retinal neurons exhibit gradual changes in membrane potential. Therefore K+ channels that mediate threshold currents are well-suited for the fine-tuning of signal transduction. In the present study we demonstrate the expression of the different Kv11 (ether-à-go-go related gene; erg) channel subunits in the human and mouse retina by RT PCR and quantitative PCR, respectively. Immunofluorescence analysis with cryosections of mouse retinae revealed the following local distribution of the three Kv11 subunits: Kv11.1 (m-erg1) displayed the most abundant expression with the strongest immunoreactivity in rod bipolar cells. In addition, immunoreactivity was found in the inner part of the outer plexiform layer (OPL), in the inner plexiform layer (IPL) and in the inner segments of photoreceptors. Immunoreactivity for Kv11.2 (m-erg2) was observed in the outer part of the OPL and throughout the IPL. Double-labeling for vGluT1 or synaptophysin indicated a mainly presynaptic localization of Kv11.2. While no significant staining for Kv11.3 (m-erg3) was detected in the neuronal retina, strong Kv11.3 immunoreactivity was present in the apical membrane of the retinal pigment epithelium. The different expression levels were confirmed by real-time PCR showing almost equal levels of Kv11.1 and Kv11.2, while Kv11.3 mRNA expression was significantly lower. The two main splice variants of Kv11.1, isoforms a and b were detected in comparable levels suggesting a possible formation of cGMP/cGK-sensitive Kv11.1 channels in photoreceptors and rod bipolar cells. Taken together, the immunohistological results revealed different expression patterns of the three Kv11 channels in the mouse retina supposing distinct physiological roles.
AB - In response to light, most retinal neurons exhibit gradual changes in membrane potential. Therefore K+ channels that mediate threshold currents are well-suited for the fine-tuning of signal transduction. In the present study we demonstrate the expression of the different Kv11 (ether-à-go-go related gene; erg) channel subunits in the human and mouse retina by RT PCR and quantitative PCR, respectively. Immunofluorescence analysis with cryosections of mouse retinae revealed the following local distribution of the three Kv11 subunits: Kv11.1 (m-erg1) displayed the most abundant expression with the strongest immunoreactivity in rod bipolar cells. In addition, immunoreactivity was found in the inner part of the outer plexiform layer (OPL), in the inner plexiform layer (IPL) and in the inner segments of photoreceptors. Immunoreactivity for Kv11.2 (m-erg2) was observed in the outer part of the OPL and throughout the IPL. Double-labeling for vGluT1 or synaptophysin indicated a mainly presynaptic localization of Kv11.2. While no significant staining for Kv11.3 (m-erg3) was detected in the neuronal retina, strong Kv11.3 immunoreactivity was present in the apical membrane of the retinal pigment epithelium. The different expression levels were confirmed by real-time PCR showing almost equal levels of Kv11.1 and Kv11.2, while Kv11.3 mRNA expression was significantly lower. The two main splice variants of Kv11.1, isoforms a and b were detected in comparable levels suggesting a possible formation of cGMP/cGK-sensitive Kv11.1 channels in photoreceptors and rod bipolar cells. Taken together, the immunohistological results revealed different expression patterns of the three Kv11 channels in the mouse retina supposing distinct physiological roles.
KW - Animals
KW - Humans
KW - Male
KW - Female
KW - Mice
KW - Gene Expression Regulation
KW - Ether-A-Go-Go Potassium Channels/genetics/metabolism
KW - Protein Subunits/genetics/metabolism
KW - RNA, Messenger/genetics/metabolism
KW - Retina/cytology/metabolism
KW - Animals
KW - Humans
KW - Male
KW - Female
KW - Mice
KW - Gene Expression Regulation
KW - Ether-A-Go-Go Potassium Channels/genetics/metabolism
KW - Protein Subunits/genetics/metabolism
KW - RNA, Messenger/genetics/metabolism
KW - Retina/cytology/metabolism
U2 - 10.1371/journal.pone.0029490
DO - 10.1371/journal.pone.0029490
M3 - SCORING: Journal article
VL - 6
SP - 29490
JO - PLOS ONE
JF - PLOS ONE
SN - 1932-6203
IS - 12
M1 - 12
ER -
