Contrasting effects of intracellular and extracellular human PCSK9 on inflammation, lipid alteration and cell death.

Aram Ghalali, Fahd Alhamdan, Swapna Upadhyay, Koustav Ganguly, Kjell Larsson, Lena Palmberg, Mizanur Rahman
Author Information
  1. Aram Ghalali: Vascular Biology Program, Boston Children Hospital, Harvard Medical school, Boston, MA, USA.
  2. Fahd Alhamdan: Department of Anesthesiology, Critical Care, and Pain Medicine, Cardiac Anesthesia Division, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.
  3. Swapna Upadhyay: Unit of Integrative Toxicology, Institute of Environmental Medicine, Karolinska Insitutet, Stockholm, Sweden.
  4. Koustav Ganguly: Unit of Integrative Toxicology, Institute of Environmental Medicine, Karolinska Insitutet, Stockholm, Sweden.
  5. Kjell Larsson: Unit of Integrative Toxicology, Institute of Environmental Medicine, Karolinska Insitutet, Stockholm, Sweden.
  6. Lena Palmberg: Unit of Integrative Toxicology, Institute of Environmental Medicine, Karolinska Insitutet, Stockholm, Sweden.
  7. Mizanur Rahman: Unit of Integrative Toxicology, Institute of Environmental Medicine, Karolinska Insitutet, Stockholm, Sweden. mizanur.rahman@ki.se. ORCID

Abstract

Proprotein convertase subtilisin/kexin type 9 (PCSK9) is one of the major regulators of low-density lipoprotein receptor (LDLR). Information on role and regulation of PCSK9 in lung is very limited. Our study focuses on understanding the role and regulation of PCSK9 in the lung. PCSK9 levels are higher in Bronchoalveolar lavage fluid (BALF) of smokers with or without chronic obstructive pulmonary diseases (COPD) compared to BALF of nonsmokers. PCSK9-stimulated cells induce proinflammatory cytokines and activation of MAPKp38. PCSK9 transcripts are highly expressed in healthy individuals compared to COPD, pulmonary fibrosis or pulmonary systemic sclerosis. Cigarette smoke extract reduce PCSK9 levels in undifferentiated pulmonary bronchial epithelial cells (PBEC) but induce in differentiated PBEC. PCSK9 inhibition affect biological pathways, induces lipid peroxidation, and higher level of apoptosis in response to staurosporine. Our results suggest that higher levels of PCSK9 in BALF acts as an inflammatory marker. Furthermore, extracellular and intracellular PCSK9 play different roles.

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MeSH Term

Humans
Proprotein Convertase 9
Inflammation
Bronchoalveolar Lavage Fluid
Pulmonary Disease, Chronic Obstructive
Cell Death
Lipid Metabolism
Male
Apoptosis
Epithelial Cells
Female

Chemicals

Proprotein Convertase 9
PCSK9 protein, human

Word Cloud

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