Prominin‐1‐Radixin axis controls hepatic gluconeogenesis by regulating PKA activity

Prominin‐1 (Prom1) is a major cell surface marker of cancer stem cells, but its physiological functions in the liver have not been elucidated. We analyzed the levels of mRNA transcripts in serum‐starved primary WT ( Prom1 +/+ ) and KO ( Prom1 −/− ) mouse hepatocytes using RNA sequencing (RNA‐seq) da...

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Veröffentlicht in:EMBO reports 2020-11, Vol.21 (11), p.e49416-n/a
Hauptverfasser: Lee, Hyun, Yu, Dong‐Min, Park, Jun Sub, Lee, Hwayeon, Kim, Jun‐Seok, Kim, Hong Lim, Koo, Seung‐Hoi, Lee, Jae‐Seon, Lee, Sungsoo, Ko, Young‐Gyu
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container_issue 11
container_start_page e49416
container_title EMBO reports
container_volume 21
creator Lee, Hyun
Yu, Dong‐Min
Park, Jun Sub
Lee, Hwayeon
Kim, Jun‐Seok
Kim, Hong Lim
Koo, Seung‐Hoi
Lee, Jae‐Seon
Lee, Sungsoo
Ko, Young‐Gyu
description Prominin‐1 (Prom1) is a major cell surface marker of cancer stem cells, but its physiological functions in the liver have not been elucidated. We analyzed the levels of mRNA transcripts in serum‐starved primary WT ( Prom1 +/+ ) and KO ( Prom1 −/− ) mouse hepatocytes using RNA sequencing (RNA‐seq) data, and found that CREB target genes were downregulated. This initial observation led us to determine that Prom1 deficiency inhibited cAMP response element‐binding protein (CREB) activation and gluconeogenesis, but not cyclic AMP (cAMP) accumulation, in glucagon‐, epinephrine‐, or forskolin‐treated liver tissues and primary hepatocytes, and mitigated glucagon‐induced hyperglycemia. Because Prom1 interacted with radixin, Prom1 deficiency prevented radixin from localizing to the plasma membrane. Moreover, systemic adenoviral knockdown of radixin inhibited CREB activation and gluconeogenesis in glucagon‐treated liver tissues and primary hepatocytes, and mitigated glucagon‐elicited hyperglycemia. Based on these results, we conclude that Prom1 regulates hepatic PKA signaling via radixin functioning as an A kinase‐anchored protein (AKAP). Synopsis Prominin‐1 in the hepatocytes interacts with radixin at the plasma membrane and regulates hepatic gluconeogenesis by augmenting PKA signaling via radixin as a PKA‐anchoring protein. The transmembrane protein Prominin‐1 is expressed in hepatocytes as well as cholangiocytes in the liver. Prominin‐1 functions as an anchor for radixin, which brings PKA holoenzyme to membrane microdomains, where local cAMP concentration is increased by glucagon‐induced activation of adenylyl cyclase. Prom1 knockout and knockdown result in inhibition of glucagon‐elicited CREB phosphorylation and gluconeogenesis in hepatocytes and livers. Graphical Abstract Prominin‐1 in the hepatocytes interacts with radixin at the plasma membrane and regulates hepatic gluconeogenesis by augmenting PKA signaling via radixin as a PKA‐anchoring protein.
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We analyzed the levels of mRNA transcripts in serum‐starved primary WT ( Prom1 +/+ ) and KO ( Prom1 −/− ) mouse hepatocytes using RNA sequencing (RNA‐seq) data, and found that CREB target genes were downregulated. This initial observation led us to determine that Prom1 deficiency inhibited cAMP response element‐binding protein (CREB) activation and gluconeogenesis, but not cyclic AMP (cAMP) accumulation, in glucagon‐, epinephrine‐, or forskolin‐treated liver tissues and primary hepatocytes, and mitigated glucagon‐induced hyperglycemia. Because Prom1 interacted with radixin, Prom1 deficiency prevented radixin from localizing to the plasma membrane. Moreover, systemic adenoviral knockdown of radixin inhibited CREB activation and gluconeogenesis in glucagon‐treated liver tissues and primary hepatocytes, and mitigated glucagon‐elicited hyperglycemia. Based on these results, we conclude that Prom1 regulates hepatic PKA signaling via radixin functioning as an A kinase‐anchored protein (AKAP). Synopsis Prominin‐1 in the hepatocytes interacts with radixin at the plasma membrane and regulates hepatic gluconeogenesis by augmenting PKA signaling via radixin as a PKA‐anchoring protein. The transmembrane protein Prominin‐1 is expressed in hepatocytes as well as cholangiocytes in the liver. Prominin‐1 functions as an anchor for radixin, which brings PKA holoenzyme to membrane microdomains, where local cAMP concentration is increased by glucagon‐induced activation of adenylyl cyclase. Prom1 knockout and knockdown result in inhibition of glucagon‐elicited CREB phosphorylation and gluconeogenesis in hepatocytes and livers. 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We analyzed the levels of mRNA transcripts in serum‐starved primary WT ( Prom1 +/+ ) and KO ( Prom1 −/− ) mouse hepatocytes using RNA sequencing (RNA‐seq) data, and found that CREB target genes were downregulated. This initial observation led us to determine that Prom1 deficiency inhibited cAMP response element‐binding protein (CREB) activation and gluconeogenesis, but not cyclic AMP (cAMP) accumulation, in glucagon‐, epinephrine‐, or forskolin‐treated liver tissues and primary hepatocytes, and mitigated glucagon‐induced hyperglycemia. Because Prom1 interacted with radixin, Prom1 deficiency prevented radixin from localizing to the plasma membrane. Moreover, systemic adenoviral knockdown of radixin inhibited CREB activation and gluconeogenesis in glucagon‐treated liver tissues and primary hepatocytes, and mitigated glucagon‐elicited hyperglycemia. Based on these results, we conclude that Prom1 regulates hepatic PKA signaling via radixin functioning as an A kinase‐anchored protein (AKAP). Synopsis Prominin‐1 in the hepatocytes interacts with radixin at the plasma membrane and regulates hepatic gluconeogenesis by augmenting PKA signaling via radixin as a PKA‐anchoring protein. The transmembrane protein Prominin‐1 is expressed in hepatocytes as well as cholangiocytes in the liver. Prominin‐1 functions as an anchor for radixin, which brings PKA holoenzyme to membrane microdomains, where local cAMP concentration is increased by glucagon‐induced activation of adenylyl cyclase. Prom1 knockout and knockdown result in inhibition of glucagon‐elicited CREB phosphorylation and gluconeogenesis in hepatocytes and livers. 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We analyzed the levels of mRNA transcripts in serum‐starved primary WT ( Prom1 +/+ ) and KO ( Prom1 −/− ) mouse hepatocytes using RNA sequencing (RNA‐seq) data, and found that CREB target genes were downregulated. This initial observation led us to determine that Prom1 deficiency inhibited cAMP response element‐binding protein (CREB) activation and gluconeogenesis, but not cyclic AMP (cAMP) accumulation, in glucagon‐, epinephrine‐, or forskolin‐treated liver tissues and primary hepatocytes, and mitigated glucagon‐induced hyperglycemia. Because Prom1 interacted with radixin, Prom1 deficiency prevented radixin from localizing to the plasma membrane. Moreover, systemic adenoviral knockdown of radixin inhibited CREB activation and gluconeogenesis in glucagon‐treated liver tissues and primary hepatocytes, and mitigated glucagon‐elicited hyperglycemia. Based on these results, we conclude that Prom1 regulates hepatic PKA signaling via radixin functioning as an A kinase‐anchored protein (AKAP). Synopsis Prominin‐1 in the hepatocytes interacts with radixin at the plasma membrane and regulates hepatic gluconeogenesis by augmenting PKA signaling via radixin as a PKA‐anchoring protein. The transmembrane protein Prominin‐1 is expressed in hepatocytes as well as cholangiocytes in the liver. Prominin‐1 functions as an anchor for radixin, which brings PKA holoenzyme to membrane microdomains, where local cAMP concentration is increased by glucagon‐induced activation of adenylyl cyclase. Prom1 knockout and knockdown result in inhibition of glucagon‐elicited CREB phosphorylation and gluconeogenesis in hepatocytes and livers. Graphical Abstract Prominin‐1 in the hepatocytes interacts with radixin at the plasma membrane and regulates hepatic gluconeogenesis by augmenting PKA signaling via radixin as a PKA‐anchoring protein.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>33030802</pmid><doi>10.15252/embr.201949416</doi><tpages>21</tpages><orcidid>https://orcid.org/0000-0002-8192-0946</orcidid><orcidid>https://orcid.org/0000-0002-0969-2598</orcidid><oa>free_for_read</oa></addata></record>
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subjects A kinase-anchoring protein
AC133 Antigen - genetics
AC133 Antigen - metabolism
Adenylate cyclase
AMP
Anchoring
Animals
cAMP signaling
Cell surface
Cyclic AMP
Cyclic AMP response element-binding protein
Cytoskeletal Proteins
EMBO03
EMBO21
EMBO37
Epinephrine
Forskolin
Gene sequencing
Glucagon
Gluconeogenesis
Gluconeogenesis - genetics
Glucose - metabolism
Hepatocytes
Hyperglycemia
Kinases
Liver
Liver - metabolism
Membrane Proteins
Membranes
Mice
Phosphorylation
Prominin‐1
Protein kinase A
Proteins
Radixin
Ribonucleic acid
RNA
Signaling
Stem cell transplantation
Stem cells
Surface markers
title Prominin‐1‐Radixin axis controls hepatic gluconeogenesis by regulating PKA activity
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