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Electrospray ionization mass spectrometric analyses of changes in tissue phospholipid molecular species during the evolution of hyperlipidemia and hyperglycemia in Zucker diabetic fatty rats

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Lipids

Abstract

The Zucker diabetic fatty (ZDF) rat is a genetic model of type II diabetes mellitus in which males homozygous for nonfunctional leptin receptors (fa/fa) develop obesity, hyperlipidemia, and hyperglycemia, but rats homozygous for normal receptors (+/+) remain lean and normoglycemic. Insulin resistance develops in young fa/fa rats and is followed by evolution of an insulin secretory defect that triggers hyperglycemia. Because insulin secretion and insulin sensitivity are affected by membrane phospholipid fatty acid composition, we have determined whether metabolic abnormalities in fa/fa rats are associated with changes in tissue phospholipids. Electrospray ionization mass spectrometric analyses of glycerophosphocholine (GPC) and glycerophosphoethanolamine (GPE) molecular species from tissues of prediabetic (6 wk of age) and overtly diabetic (12 wk) fa/fa rats and from +/+ rats of the same ages indicate that arachidonate-containing species from heart, aorta, and liver of prediabetic fa/fa rats made a smaller contribution to GPC total ion current than was the case for +/+ rats. There was a correspondingly larger contribution from species with sn-2 oleate or linoleate substituents in fa/fa heart and aorta. The relative contributions of arachidonate-containing GPC species increased in these tissues as fa/fa rats aged and were equal to or greater than those for +/+ rats by 12 wk. For heart and aorta, relative contributions from GPE species with sn-2 arachidonate or docosahexaenoate substituents to the total ion current increased and those from species with sn-2 oleate or linoleate substituents fell as fa/fa rats aged, but these tissue lipid profiles changed little with age in +/+ rats. GPC and GPE profiles for brain, kidney, sciatic nerve, and red blood cells were similar among fa/fa and +/+ rats at 6 and 12 wk or age, and pancreatic islets from fa/fa and +/+ rats exhibited similar GPC and GPE profiles at 12 wk of age. Under-representation of arachidonate-containing GPC and GPE species in some fa/fa rat tissues at 6 wk could contribute to insulin resistance, but depletion of islet arachidonate-containing GPC and GPE species is unlikely to explain the evolution of the insulin secretory defect that is well-developed by 12 wk of age.

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Abbreviations

CAD:

collisionally activated dissociation

ESI:

electrospray ionization

GPC:

glycerophosphocholine

GPE:

glycerophosphoethanolamine

HPLC:

high-performance liquid chromatography

IDDM:

insulin-dependent diabetes mellitus

NIDDM:

non-insulin-dependent diabetes mellitus

NP:

normal phase

MS:

mass spectrometry

PBS:

phosphate-buffered saline

ZDF:

Zucker diabetic fatty

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Authors and Affiliations

  1. Medicine Department Mass Spectrometry Facility, Division of Diabetes, Endocrinology, and Metabolism, Washington University School of Medicine, 660 S. Euclid Ave., Box 8127, 63110, St. Louis, MO

    Fong-Fu Hsu, Alan Bohrer, Mary Wohltmann, Sasanka Ramanadham, Zhongmin Ma, Kevin Yarasheski & John Turk

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  1. Fong-Fu Hsu
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  2. Alan Bohrer
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  3. Mary Wohltmann
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  4. Sasanka Ramanadham
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  5. Zhongmin Ma
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  7. John Turk
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Correspondence to John Turk.

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Hsu, FF., Bohrer, A., Wohltmann, M. et al. Electrospray ionization mass spectrometric analyses of changes in tissue phospholipid molecular species during the evolution of hyperlipidemia and hyperglycemia in Zucker diabetic fatty rats. Lipids 35, 839–852 (2000). https://doi.org/10.1007/S11745-000-0593-z

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  • DOI: https://doi.org/10.1007/S11745-000-0593-z

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