Table 1.
Selected secreted and membrane-localized proteins of the hepatocyte
GeneProteinFunction
Secreted proteins   
ALB Human serum albumin Carrier protein 
AFP α-fetoprotein Fetal carrier protein 
TF Transferrin Iron binding/transport 
PLG Plasminogen (Plasmin) Proteolysis/fibrinolysis 
SERPINA1 α-1-antitrypsin Protease inhibitor 
CRP C-reactive protein Acute-phase protein 
 Various coagulation factors (with the exception of factor VIII)  
Basolateral (sinusoidal) membrane proteins   
LDLR LDLR Uptake of LDL particles 
Various Na+/K+ ATPase Sodium/potassium exchange 
TFRC/TFR2 TfR Iron import into hepatocytes 
SLC10A1 Sodium/bile acid cotransporter (NTCP) Sinusoidal bile acid uptake 
SLCO1B1/3 Organic anion-transporting peptides Bile acid transporters 
PIGR Polymeric Ig receptor IgA transcytosis 
ASGR1/2 Asialoglycoprotein receptors Glycoprotein removal 
Apical (canalicular) membrane proteins   
ABCB4 MDR3 Biliary phospholipid secretion 
ABCB11 BSEP Bile salt efflux from hepatocytes 
ATP8B1 Aminophospholipid flippase Lipid asymmetry 
ABCG5/8 Sterolin 1 and 2 Sterol absorption/secretion 
SLC4A2 Solute carrier family 4 (AE2) Anion exchange 
ALPL Liver alkaline phosphatase Alkaline phosphatase 
ABCB1 MDR1 Organic cation secretion 
ABCC2 MRP2 Biliary transport 
ABCG2 BCRP ABC transporter 
GeneProteinFunction
Secreted proteins   
ALB Human serum albumin Carrier protein 
AFP α-fetoprotein Fetal carrier protein 
TF Transferrin Iron binding/transport 
PLG Plasminogen (Plasmin) Proteolysis/fibrinolysis 
SERPINA1 α-1-antitrypsin Protease inhibitor 
CRP C-reactive protein Acute-phase protein 
 Various coagulation factors (with the exception of factor VIII)  
Basolateral (sinusoidal) membrane proteins   
LDLR LDLR Uptake of LDL particles 
Various Na+/K+ ATPase Sodium/potassium exchange 
TFRC/TFR2 TfR Iron import into hepatocytes 
SLC10A1 Sodium/bile acid cotransporter (NTCP) Sinusoidal bile acid uptake 
SLCO1B1/3 Organic anion-transporting peptides Bile acid transporters 
PIGR Polymeric Ig receptor IgA transcytosis 
ASGR1/2 Asialoglycoprotein receptors Glycoprotein removal 
Apical (canalicular) membrane proteins   
ABCB4 MDR3 Biliary phospholipid secretion 
ABCB11 BSEP Bile salt efflux from hepatocytes 
ATP8B1 Aminophospholipid flippase Lipid asymmetry 
ABCG5/8 Sterolin 1 and 2 Sterol absorption/secretion 
SLC4A2 Solute carrier family 4 (AE2) Anion exchange 
ALPL Liver alkaline phosphatase Alkaline phosphatase 
ABCB1 MDR1 Organic cation secretion 
ABCC2 MRP2 Biliary transport 
ABCG2 BCRP ABC transporter 

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