# LIPIDS IN THE PATHOGENESIS OF OSTEOARTHROSIS

> **NIH NIH R01** · UNIVERSITY OF NEBRASKA MEDICAL CENTER · 1989 · $86,807

## Abstract

Lipids are constant inclusions in chondrocytes of hyaline as well
as other cartilages but their significance to chondrocyte function
and metabolism in unknown.  Lipids accumulate during normal
aging in healthy tissue although similar increases in deposits have
also been associated with disease states and trauma.
Chondrocytes readily and perhaps selectively take up lipids so
that levels and trauma.  Chondrocytes readily and perhaps
selectively take up lipids so that levels and types of dietary lipid
intake may influence lipid profiles in cartilage in spite of cellular
control systems operating to maintain cell lipid constancy.
Lipoarthrosis has been observed in instability models of arthrosis,
in an inherited disease associated with precocious arthrosis and
following traumatic insults to articular cartilage.

This proposal addresses the question of the role of lipid in normal
cartilage by exploring whether age-related lipid accumulation
promotes/initiates aberrations in chondrocyte metabolism which
may lead to tissue degeneration.  A second approach is to examine
if lipid-laden cells can maintain a homeostatic state upon
exposure to mechanical stimuli.

A series of two major experiments are described.  In vitro we will
study whether variations in specific fatty acid profiles of lipids
differentially affect chondrocyte metabolism as indicated by
biosynthesis of proteoglycans and collagen, and in vivo, using
dietary manipulation of cell lipid content.  The latter study will
explore the effects of hyperlipoproteinemia
(hypercholesterolemia) on cartilage metabolism.  The hypothesis
to be tested is that specific fatty acids (i.e., 20:4) influence
cartilage metabolism when accumlated in excess and that lipid-
laden cells lose their capacity to withstand mechanical forces.
Second, a state of hyperlipidemia induces aberrant cartilage
metabolism if lipid accumalation by chondrocytes includes the
essential fatty acids arachidonic acid or linoleic acid.  It is the
intent of the P.I. to initiate pilot studies on mechanisms whereby
lipid accumulation alters normal cartilage physiology.  These
include effects on membrane fluidity, energy storage/utilization
and physical interaction with macromolecules.

## Key facts

- **NIH application ID:** 3159419
- **Project number:** 5R01AR039381-02
- **Recipient organization:** UNIVERSITY OF NEBRASKA MEDICAL CENTER
- **SAM.gov UEI:** G15AG3BLLMH4
- **Principal Investigator:** LOUIS LIPPIELLO
- **Activity code:** R01 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 1989
- **Award amount:** $86,807
- **Award type:** 5
- **Project period:** 1988-04-01 → 1991-03-31

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/3159419

## Citation

> US National Institutes of Health, RePORTER application 3159419, LIPIDS IN THE PATHOGENESIS OF OSTEOARTHROSIS (5R01AR039381-02). Retrieved via MORVS 2026-10-24 from https://api.morvs.ai/grant/nih/3159419. Licensed CC0.

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