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Regulation of Adipogenesis by Lymphatic fluid Stasis Part II: Expression of Adipose Differentiation Genes

Identifieur interne : 003F24 ( Main/Exploration ); précédent : 003F23; suivant : 003F25

Regulation of Adipogenesis by Lymphatic fluid Stasis Part II: Expression of Adipose Differentiation Genes

Auteurs : Seth Aschen [États-Unis] ; Jamie C. Zampell [États-Unis] ; Sonia Elhadad [États-Unis] ; Evan Weitman [États-Unis] ; Marina De Brot Andrade [États-Unis] ; Babak J. Mehrara [États-Unis]

Source :

RBID : PMC:3445411

Descripteurs français

English descriptors

Abstract

Background

Although fat deposition is a defining clinical characteristic of lymphedema, the cellular mechanisms that regulate this response remain unknown. The goal of this study was to determine how lymphatic fluid stasis regulates adipogenic gene activation and fat deposition.

Methods

Adult female mice underwent tail lymphatic ablation and sacrifice at 1, 3, or 6 weeks post-operatively (n=8/group). Samples were analyzed by immunohistochemistry and western blot. An alternative group of mice underwent axillary dissections or sham incisions and limb tissues were harvested 3 weeks post-operatively (n=8/group).

Results

Lymphatic fluid stasis resulted in significant subcutaneous fat deposition and fibrosis in lymphedematous tail regions (p<0.001). Western blot analysis demonstrated that proteins regulating adipose differentiation including CCAAT/enhancer binding protein-alpha (CEBP-α) and adiponectin were markedly upregulated in response to lymphatic fluid stasis in the tail and axillary models. Expression of these markers increased in edematous tissues according to the gradient of lymphatic stasis distal to the wound. Immunohistochemical analysis further demonstrated that adiponectin and peroxisome proliferator-activated receptor gamma (PPAR-γ), another critical adipogenic transcription factor, followed similar expression gradients. Finally, adiponectin and PPAR-γ expression localized to a variety of cell types in newly formed subcutaneous fat.

Conclusions

The mouse-tail model of lymphedema demonstrates pathological findings similar to clinical lymphedema including fat deposition and fibrosis. We show that lymphatic fluid stasis potently upregulates the expression of fat differentiation markers both spatially and temporally. These studies elucidate mechanisms regulating abnormal fat deposition in lymphedema pathogenesis and therefore provide a basis for developing targeted treatments.


Url:
DOI: 10.1097/PRS.0b013e3182450b47
PubMed: 22456356
PubMed Central: 3445411


Affiliations:


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<term>Adiponectine (métabolisme)</term>
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<term>Animaux</term>
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<term>Adipocytes</term>
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<term>Cell Differentiation</term>
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<term>Disease Models, Animal</term>
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<term>Fibrosis</term>
<term>Forelimb</term>
<term>Gene Expression Regulation</term>
<term>Immunohistochemistry</term>
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<term>Membre thoracique</term>
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<front>
<div type="abstract" xml:lang="en">
<sec id="S1">
<title>Background</title>
<p id="P1">Although fat deposition is a defining clinical characteristic of lymphedema, the cellular mechanisms that regulate this response remain unknown. The goal of this study was to determine how lymphatic fluid stasis regulates adipogenic gene activation and fat deposition.</p>
</sec>
<sec id="S2">
<title>Methods</title>
<p id="P2">Adult female mice underwent tail lymphatic ablation and sacrifice at 1, 3, or 6 weeks post-operatively (n=8/group). Samples were analyzed by immunohistochemistry and western blot. An alternative group of mice underwent axillary dissections or sham incisions and limb tissues were harvested 3 weeks post-operatively (n=8/group).</p>
</sec>
<sec id="S3">
<title>Results</title>
<p id="P3">Lymphatic fluid stasis resulted in significant subcutaneous fat deposition and fibrosis in lymphedematous tail regions (p<0.001). Western blot analysis demonstrated that proteins regulating adipose differentiation including CCAAT/enhancer binding protein-alpha (CEBP-α) and adiponectin were markedly upregulated in response to lymphatic fluid stasis in the tail and axillary models. Expression of these markers increased in edematous tissues according to the gradient of lymphatic stasis distal to the wound. Immunohistochemical analysis further demonstrated that adiponectin and peroxisome proliferator-activated receptor gamma (PPAR-γ), another critical adipogenic transcription factor, followed similar expression gradients. Finally, adiponectin and PPAR-γ expression localized to a variety of cell types in newly formed subcutaneous fat.</p>
</sec>
<sec id="S4">
<title>Conclusions</title>
<p id="P4">The mouse-tail model of lymphedema demonstrates pathological findings similar to clinical lymphedema including fat deposition and fibrosis. We show that lymphatic fluid stasis potently upregulates the expression of fat differentiation markers both spatially and temporally. These studies elucidate mechanisms regulating abnormal fat deposition in lymphedema pathogenesis and therefore provide a basis for developing targeted treatments.</p>
</sec>
</div>
</front>
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