Platelet-type 12-lipoxygenase deletion provokes a compensatory 12/15-lipoxygenase increase that exacerbates oxidative stress in mouse islet β cells

Abass M. Conteh, Christopher A. Reissaus, Marimar Hernandez-Perez, Swetha Nakshatri, Ryan M. Anderson, Raghu Mirmira, Sarah A. Tersey, Amelia Linnemann

Research output: Contribution to journalArticle

Abstract

In type 1 diabetes, an autoimmune event increases oxidative stress in islet β cells, giving rise to cellular dysfunction and apoptosis. Lipoxygenases are enzymes that catalyze the oxygenation of polyunsaturated fatty acids that can form lipid metabolites involved in several biological functions, including oxidative stress. 12-Lipoxygenase and 12/15-lipoxygenase are related but distinct enzymes that are expressed in pancreatic islets, but their relative contributions to oxidative stress in these regions are still being elucidated. In this study, we used mice with global genetic deletion of the genes encoding 12-lipoxygenase (arachidonate 12-lipoxygenase, 12S type [Alox12]) or 12/15-lipoxygenase (Alox15) to compare the influence of each gene deletion on β cell function and survival in response to theβ cell toxin streptozotocin. Alox12 -/- mice exhibited greater impairment in glucose tolerance following streptozotocin exposure than WT mice, whereas Alox15 -/- mice were protected against dysglycemia. These changes were accompanied by evidence of islet oxidative stress in Alox12 -/- mice and reduced oxidative stress in Alox15 -/- mice, consistent with alterations in the expression of the antioxidant response enzymes in islets from these mice. Additionally, islets from Alox12 -/- mice displayed a compensatory increase in Alox15 gene expression, and treatment of these mice with the 12/15-lipoxygenase inhibitor ML-351 rescued the dysglycemic phenotype. Collectively, these results indicate that Alox12 loss activates a compensatory increase in Alox15 that sensitizes mouse β cells to oxidative stress.

Original languageEnglish (US)
Pages (from-to)6612-6620
Number of pages9
JournalJournal of Biological Chemistry
Volume294
Issue number16
DOIs
StatePublished - Jan 1 2019

Fingerprint

Arachidonate 12-Lipoxygenase
Oxidative stress
Platelets
Islets of Langerhans
Oxidative Stress
Blood Platelets
Lipoxygenase Inhibitors
Streptozocin
Gene Deletion
Enzymes
Lipoxygenases
12-15-lipoxygenase
Gene encoding
Oxygenation
Medical problems
Metabolites
Unsaturated Fatty Acids
Gene expression
Type 1 Diabetes Mellitus
Antioxidants

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Platelet-type 12-lipoxygenase deletion provokes a compensatory 12/15-lipoxygenase increase that exacerbates oxidative stress in mouse islet β cells. / Conteh, Abass M.; Reissaus, Christopher A.; Hernandez-Perez, Marimar; Nakshatri, Swetha; Anderson, Ryan M.; Mirmira, Raghu; Tersey, Sarah A.; Linnemann, Amelia.

In: Journal of Biological Chemistry, Vol. 294, No. 16, 01.01.2019, p. 6612-6620.

Research output: Contribution to journalArticle

Conteh, Abass M. ; Reissaus, Christopher A. ; Hernandez-Perez, Marimar ; Nakshatri, Swetha ; Anderson, Ryan M. ; Mirmira, Raghu ; Tersey, Sarah A. ; Linnemann, Amelia. / Platelet-type 12-lipoxygenase deletion provokes a compensatory 12/15-lipoxygenase increase that exacerbates oxidative stress in mouse islet β cells. In: Journal of Biological Chemistry. 2019 ; Vol. 294, No. 16. pp. 6612-6620.
@article{78a23601fa6b4654a5fe434f4a0b269f,
title = "Platelet-type 12-lipoxygenase deletion provokes a compensatory 12/15-lipoxygenase increase that exacerbates oxidative stress in mouse islet β cells",
abstract = "In type 1 diabetes, an autoimmune event increases oxidative stress in islet β cells, giving rise to cellular dysfunction and apoptosis. Lipoxygenases are enzymes that catalyze the oxygenation of polyunsaturated fatty acids that can form lipid metabolites involved in several biological functions, including oxidative stress. 12-Lipoxygenase and 12/15-lipoxygenase are related but distinct enzymes that are expressed in pancreatic islets, but their relative contributions to oxidative stress in these regions are still being elucidated. In this study, we used mice with global genetic deletion of the genes encoding 12-lipoxygenase (arachidonate 12-lipoxygenase, 12S type [Alox12]) or 12/15-lipoxygenase (Alox15) to compare the influence of each gene deletion on β cell function and survival in response to theβ cell toxin streptozotocin. Alox12 -/- mice exhibited greater impairment in glucose tolerance following streptozotocin exposure than WT mice, whereas Alox15 -/- mice were protected against dysglycemia. These changes were accompanied by evidence of islet oxidative stress in Alox12 -/- mice and reduced oxidative stress in Alox15 -/- mice, consistent with alterations in the expression of the antioxidant response enzymes in islets from these mice. Additionally, islets from Alox12 -/- mice displayed a compensatory increase in Alox15 gene expression, and treatment of these mice with the 12/15-lipoxygenase inhibitor ML-351 rescued the dysglycemic phenotype. Collectively, these results indicate that Alox12 loss activates a compensatory increase in Alox15 that sensitizes mouse β cells to oxidative stress.",
author = "Conteh, {Abass M.} and Reissaus, {Christopher A.} and Marimar Hernandez-Perez and Swetha Nakshatri and Anderson, {Ryan M.} and Raghu Mirmira and Tersey, {Sarah A.} and Amelia Linnemann",
year = "2019",
month = "1",
day = "1",
doi = "10.1074/jbc.RA118.007102",
language = "English (US)",
volume = "294",
pages = "6612--6620",
journal = "Journal of Biological Chemistry",
issn = "0021-9258",
publisher = "American Society for Biochemistry and Molecular Biology Inc.",
number = "16",

}

TY - JOUR

T1 - Platelet-type 12-lipoxygenase deletion provokes a compensatory 12/15-lipoxygenase increase that exacerbates oxidative stress in mouse islet β cells

AU - Conteh, Abass M.

AU - Reissaus, Christopher A.

AU - Hernandez-Perez, Marimar

AU - Nakshatri, Swetha

AU - Anderson, Ryan M.

AU - Mirmira, Raghu

AU - Tersey, Sarah A.

AU - Linnemann, Amelia

PY - 2019/1/1

Y1 - 2019/1/1

N2 - In type 1 diabetes, an autoimmune event increases oxidative stress in islet β cells, giving rise to cellular dysfunction and apoptosis. Lipoxygenases are enzymes that catalyze the oxygenation of polyunsaturated fatty acids that can form lipid metabolites involved in several biological functions, including oxidative stress. 12-Lipoxygenase and 12/15-lipoxygenase are related but distinct enzymes that are expressed in pancreatic islets, but their relative contributions to oxidative stress in these regions are still being elucidated. In this study, we used mice with global genetic deletion of the genes encoding 12-lipoxygenase (arachidonate 12-lipoxygenase, 12S type [Alox12]) or 12/15-lipoxygenase (Alox15) to compare the influence of each gene deletion on β cell function and survival in response to theβ cell toxin streptozotocin. Alox12 -/- mice exhibited greater impairment in glucose tolerance following streptozotocin exposure than WT mice, whereas Alox15 -/- mice were protected against dysglycemia. These changes were accompanied by evidence of islet oxidative stress in Alox12 -/- mice and reduced oxidative stress in Alox15 -/- mice, consistent with alterations in the expression of the antioxidant response enzymes in islets from these mice. Additionally, islets from Alox12 -/- mice displayed a compensatory increase in Alox15 gene expression, and treatment of these mice with the 12/15-lipoxygenase inhibitor ML-351 rescued the dysglycemic phenotype. Collectively, these results indicate that Alox12 loss activates a compensatory increase in Alox15 that sensitizes mouse β cells to oxidative stress.

AB - In type 1 diabetes, an autoimmune event increases oxidative stress in islet β cells, giving rise to cellular dysfunction and apoptosis. Lipoxygenases are enzymes that catalyze the oxygenation of polyunsaturated fatty acids that can form lipid metabolites involved in several biological functions, including oxidative stress. 12-Lipoxygenase and 12/15-lipoxygenase are related but distinct enzymes that are expressed in pancreatic islets, but their relative contributions to oxidative stress in these regions are still being elucidated. In this study, we used mice with global genetic deletion of the genes encoding 12-lipoxygenase (arachidonate 12-lipoxygenase, 12S type [Alox12]) or 12/15-lipoxygenase (Alox15) to compare the influence of each gene deletion on β cell function and survival in response to theβ cell toxin streptozotocin. Alox12 -/- mice exhibited greater impairment in glucose tolerance following streptozotocin exposure than WT mice, whereas Alox15 -/- mice were protected against dysglycemia. These changes were accompanied by evidence of islet oxidative stress in Alox12 -/- mice and reduced oxidative stress in Alox15 -/- mice, consistent with alterations in the expression of the antioxidant response enzymes in islets from these mice. Additionally, islets from Alox12 -/- mice displayed a compensatory increase in Alox15 gene expression, and treatment of these mice with the 12/15-lipoxygenase inhibitor ML-351 rescued the dysglycemic phenotype. Collectively, these results indicate that Alox12 loss activates a compensatory increase in Alox15 that sensitizes mouse β cells to oxidative stress.

UR - http://www.scopus.com/inward/record.url?scp=85064853963&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85064853963&partnerID=8YFLogxK

U2 - 10.1074/jbc.RA118.007102

DO - 10.1074/jbc.RA118.007102

M3 - Article

VL - 294

SP - 6612

EP - 6620

JO - Journal of Biological Chemistry

JF - Journal of Biological Chemistry

SN - 0021-9258

IS - 16

ER -