Nerve growth factor (NGF) and pro-NGF increase low-density lipoprotein (LDL) receptors in neuronal cells partly by different mechanisms: role of LDL in neurite outgrowth.
Low-density lipoprotein receptors (LDLRs) mediate the uptake of lipoprotein particles into cells, as studied mainly in peripheral tissues. Here, we show that nerve growth factor (NGF) increases LDLR levels in PC6.3 cells and in cultured septal neurons from embryonic rat brain. Study of the mechanisms showed that NGF enhanced transcription of the LDLR gene, acting mainly via Tropomyosin receptor kinase A receptors. Simvastatin, a cholesterol-lowering drug, also increased the LDLR expression in PC6.3 cells. In addition, pro-NGF and pro-brain-derived neurotrophic factor, acting via the p75 neurotrophin receptor (p75NTR) also increased LDLRs. We further observed that Myosin Regulatory Light Chain-Interacting Protein/Inducible Degrader of the LDLR (Mylip/Idol) was down-regulated by pro-NGF, whereas the other LDLR regulator, proprotein convertase subtilisin kexin 9 (PCSK9) was not significantly changed. On the functional side, NGF and pro-NGF increased lipoprotein uptake by neuronal cells as shown using diacetyl-labeled LDL. The addition of serum-derived lipoprotein particles in conjunction with NGF or simvastatin enhanced neurite outgrowth. Collectively, these results show that NGF and simvastatin are able to stimulate lipoprotein uptake by neurons with a positive effect on neurite outgrowth. Increases in LDLRs and lipoprotein particles in neurons could play a functional role during brain development, in neuroregeneration and after brain injuries. Nerve growth factor (NGF) and pro-NGF induce the expression of low-density lipoprotein receptors (LDLRs) in neuronal cells leading to increased LDLR levels. Pro-NGF also down-regulated myosin regulatory light chain-interacting protein/inducible degrader of the LDLR (Mylip/Idol) that is involved in the degradation of LDLRs. NGF acts mainly via Tropomyosin receptor kinase A (TrkA) receptors, whereas pro-NGF stimulates p75 neurotrophin receptor (p75NTR). Elevated LDLRs upon NGF and pro-NGF treatments enhanced lipoprotein uptake by neurons. Addition of LDL particles further led to the stimulation of neurite outgrowth in PC6.3 cells after NGF or simvastatin treatments, suggesting a stimulatory role of lipoproteins on neuronal differentiation. In contrast, pro-NGF had no effect on neurite outgrowth either in the absence or presence of LDL particles. The precise mechanisms by which increased lipoproteins uptake can affect neurite outgrowth warrant further studies.
Department of Biochemistry and Developmental Biology, Medical Faculty, Medicum, University of Helsinki, Helsinki, Finland.|Minerva Foundation Institute for Medical Research, Helsinki, Finland.
Hai Thi
HT
Do
Department of Biochemistry and Developmental Biology, Medical Faculty, Medicum, University of Helsinki, Helsinki, Finland.|Minerva Foundation Institute for Medical Research, Helsinki, Finland.
Céline
C
Bruelle
Department of Biochemistry and Developmental Biology, Medical Faculty, Medicum, University of Helsinki, Helsinki, Finland.|Minerva Foundation Institute for Medical Research, Helsinki, Finland.
Dan Duc
DD
Pham
Genomics and Biomarkers Unit, National Institute for Health and Welfare, Helsinki, Finland.
Matti
M
Jauhiainen
Minerva Foundation Institute for Medical Research, Helsinki, Finland.
Ove
O
Eriksson
Department of Biochemistry and Developmental Biology, Medical Faculty, Medicum, University of Helsinki, Helsinki, Finland.|Minerva Foundation Institute for Medical Research, Helsinki, Finland.|Division of Child Psychiatry, Helsinki University Central Hospital, Helsinki, Finland.
Laura T
LT
Korhonen
Department of Biochemistry and Developmental Biology, Medical Faculty, Medicum, University of Helsinki, Helsinki, Finland.|Minerva Foundation Institute for Medical Research, Helsinki, Finland.
Dan
D
Lindholm
D000818:Animals; D000906:Antibodies / Q000494:pharmacology; D001565:Benzoates / Q000494:pharmacology; D001596:Benzylamines / Q000494:pharmacology; D002227:Carbazoles / Q000494:pharmacology; D002478:Cells, Cultured; D016895:Culture Media, Serum-Free / Q000494:pharmacology; D004622:Embryo, Mammalian; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D026121:Indole Alkaloids / Q000494:pharmacology; D008077:Lipoproteins, LDL / Q000378:metabolism*; D020932:Nerve Growth Factor / Q000494:pharmacology; D009414:Nerve Growth Factors / Q000494:pharmacology; D016501:Neurites / Q000187:drug effects / Q000502:physiology*; D009474:Neurons / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D011498:Protein Precursors / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D011973:Receptors, LDL / Q000276:immunology / Q000378:metabolism*; D017475:Receptors, Nerve Growth Factor / Q000378:metabolism*; D020665:Septum of Brain / Q000166:cytology; D019821:Simvastatin / Q000494:pharmacology
D000906:Antibodies; D001565:Benzoates; D001596:Benzylamines; D002227:Carbazoles; D016895:Culture Media, Serum-Free; D004791:Enzyme Inhibitors; C473027:GW 3965; D026121:Indole Alkaloids; D008077:Lipoproteins, LDL; D009414:Nerve Growth Factors; D011498:Protein Precursors; D011973:Receptors, LDL; D017475:Receptors, Nerve Growth Factor; C514218:pro-nerve growth factor, rat; D020932:Nerve Growth Factor; C049985:staurosporine aglycone; D019821:Simvastatin
LDLR; Mylip/Idol; NGF; PCSK9; pro-BDNF; pro-NGF