Lead-induced accumulation of β-amyloid in the choroid plexus

Role of low density lipoprotein receptor protein-1 and protein kinase C

Mamta Behl, Yanshu Zhang, Yunzhou Shi, Jixin Cheng, Yansheng Du, Wei Zheng

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The choroid plexus (CP), constituting the blood-cerebrospinal fluid barrier, has the capacity to remove beta-amyloid (Aβ) from the cerebrospinal fluid. Our previous work indicates that exposure to lead (Pb) results in Aβ accumulation in the CP by decreasing the expression of low density lipoprotein receptor protein-1 (LRP1), a protein involved in the transport and clearance of Aβ. The current study was designed to explore the relationship between Aβ accumulation, protein kinase C (PKC) activity, and LRP1 status in the CP following Pb exposure. Confocal microscopy revealed that LRP1 was primarily localized in the cytosol of the CP in control rats and migrated distinctly towards the apical surface and the microvilli following acute Pb exposure (27 mg Pb/kg, i.p., 24 h). Co-immunostaining revealed a co-localization of both PKC-δ and LRP1 in the cytosol of control rats, with a distinct relocalization of both towards the apical membrane following Pb exposure. Preincubation of the tissues with PKC-δ inhibitor rottlerin (2. μM) prior to Pb exposure in vitro, resulted in abolishing the Pb-induced relocalization of LRP1 to the apical surface. Importantly, a significant elevation in intracellular Aβ levels (p< 0.01) was observed in the cytosol of the CP following Pb exposure, which was abolished following preincubation with rottlerin. In addition, rottlerin caused a relocalization of Aβ from the cytosol to the nucleus in both Pb-treated and control CP tissues. Finally, co-immunoprecipitation studies revealed a strong protein-protein interaction between LRP1 and PKC-δ in the CP. These studies suggest that Pb exposure disrupts Aβ homeostasis at the CP, owing partly to a Pb-induced relocalization of LRP1 via PKC-δ.

Original languageEnglish
Pages (from-to)524-532
Number of pages9
JournalNeuroToxicology
Volume31
Issue number5
DOIs
StatePublished - Sep 2010

Fingerprint

Choroid Plexus
LDL Receptors
Amyloid
Protein Kinase C
Lipoprotein Receptors
Proteins
Cytosol
Rat control
Cerebrospinal fluid
Cerebrospinal Fluid
Lead
Tissue
Protein C Inhibitor
Confocal microscopy
Protein Kinase Inhibitors
Microvilli
Immunoprecipitation
Confocal Microscopy
Homeostasis
Blood

Keywords

  • Blood-CSF barrier
  • Choroid plexus
  • Lead or Pb
  • LRP1
  • PKC-δ
  • Protein kinase C
  • Rottlerin

ASJC Scopus subject areas

  • Neuroscience(all)
  • Toxicology

Cite this

Lead-induced accumulation of β-amyloid in the choroid plexus : Role of low density lipoprotein receptor protein-1 and protein kinase C. / Behl, Mamta; Zhang, Yanshu; Shi, Yunzhou; Cheng, Jixin; Du, Yansheng; Zheng, Wei.

In: NeuroToxicology, Vol. 31, No. 5, 09.2010, p. 524-532.

Research output: Contribution to journalArticle

Behl, Mamta ; Zhang, Yanshu ; Shi, Yunzhou ; Cheng, Jixin ; Du, Yansheng ; Zheng, Wei. / Lead-induced accumulation of β-amyloid in the choroid plexus : Role of low density lipoprotein receptor protein-1 and protein kinase C. In: NeuroToxicology. 2010 ; Vol. 31, No. 5. pp. 524-532.
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