CoChat
Sign Up
Cited by 786Adipokines, Inflammation, and Metabolic DiseasesAdipose Tissue and MetabolismCardiovascular Disease and Adiposity

The DOI matches its Crossref record; 46 of the 46 references it cites were found in a registry or an index.

Reduced Adipose Tissue Oxygenation in Human Obesity

Open access
Pasarica, Magdalena, Sereda, Olga R., Redman, Leanne M., Albarado, Diana C., Hymel, David T., Roan, Laura E., Rood, Jennifer C., Burk, David H., Smith, Steven R.·2009·Diabetes
DOI 10.2337/db08-1098PMC PMC2646071
Open this paper in CoChat — free account

Abstract

OBJECTIVE— Based on rodent studies, we examined the hypothesis that increased adipose tissue (AT) mass in obesity without an adequate support of vascularization might lead to hypoxia, macrophage infiltration, and inflammation. RESEARCH DESIGN AND METHODS— Oxygen partial pressure (AT pO2) and AT temperature in abdominal AT (9 lean and 12 overweight/obese men and women) was measured by direct insertion of a polarographic Clark electrode. Body composition was measured by dual-energy X-ray absorptiometry, and insulin sensitivity was measured by hyperinsulinemic-euglycemic clamp. Abdominal subcutaneous tissue was used for staining, quantitative RT-PCR, and chemokine secretion assay. RESULTS— AT pO2 was lower in overweight/obese subjects than lean subjects (47 ± 10.6 vs. 55 ± 9.1 mmHg); however, this level of pO2 did not activate the classic hypoxia targets (pyruvate dehydrogenase kinase and vascular endothelial growth factor [VEGF]). AT pO2 was negatively correlated with percent body fat (R = −0.50, P < 0.05). Compared with lean subjects, overweight/obese subjects had 44% lower capillary density and 58% lower VEGF, suggesting AT rarefaction (capillary drop out). This might be due to lower peroxisome proliferator–activated receptor γ1 and higher collagen VI mRNA expression, which correlated with AT pO2 (P < 0.05). Of clinical importance, AT pO2 negatively correlated with CD68 mRNA and macrophage inflammatory protein 1α secretion (R = −0.58, R = −0.79, P < 0.05), suggesting that lower AT pO2 could drive AT inflammation in obesity. CONCLUSIONS— Adipose tissue rarefaction might lie upstream of both low AT pO2 and inflammation in obesity. These results suggest novel approaches to treat the dysfunctional AT found in obesity.

Overview

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.2337/db08-1098

Cites

46 of 46 references verified0 citation errors · 0 not checkable

Statistics

Figures

FIG. 1. AT pO2 and AT temperature are inversely correlated with percent body fat. AT pO2, measured by direct insertion of a micro Clark-type electrode into abdominal subcutaneous AT, was lower in overweight/obese group (O/O) compared with lean subjects (A) and inversely correlated with percent body fat (B). AT temperature measured by a thermocouple inserted into the abdominal AT was inversely correlated with percent body fat (C). Males are represented by squares and females by circles, filled with different colors as follows: white for lean, gray for O/O without type 2 diabetes, and black for O/O with type 2 diabetes.
FIG. 1. AT pO2 and AT temperature are inversely correlated with percent body fat. AT pO2, measured by direct insertion of a micro Clark-type electrode into abdominal subcutaneous AT, was lower in overweight/obese group (O/O) compared with lean subjects (A) and inversely correlated with percent body fat (B). AT temperature measured by a thermocouple inserted into the abdominal AT was inversely correlated with percent body fat (C). Males are represented by squares and females by circles, filled with different colors as follows: white for lean, gray for O/O without type 2 diabetes, and black for O/O with type 2 diabetes.CC BY-NC-ND · PubMed Central
FIG. 2. Vascularization of AT. Representative AT sections from lean (A) and O/O (B) subjects stained with UEA lectin (orange) to label capillaries and with GS lectin (green) to label the adipocyte plasmalemma. Capillary density (C) was measured and averaged across 6–10 histological sections for each subject and VEGF mRNA expression measured by quantitative RT-PCR (D); both were lower in O/O versus lean subjects. VEGF mRNA was positively correlated with capillary density (E) and PPARγ1 mRNA (G) and inversely with percent body fat (F). H: Collagen VI (COL6) mRNA was negatively correlated with AT pO2. Males are represented by squares and females by circles, filled with different colors as follows: white for lean, gray for O/O without type 2 diabetes, and black for O/O with type 2 diabetes. (Please see http://dx.doi.org/10.2337/db08-1098 for a high-quality digital representation of this figure.)
FIG. 2. Vascularization of AT. Representative AT sections from lean (A) and O/O (B) subjects stained with UEA lectin (orange) to label capillaries and with GS lectin (green) to label the adipocyte plasmalemma. Capillary density (C) was measured and averaged across 6–10 histological sections for each subject and VEGF mRNA expression measured by quantitative RT-PCR (D); both were lower in O/O versus lean subjects. VEGF mRNA was positively correlated with capillary density (E) and PPARγ1 mRNA (G) and inversely with percent body fat (F). H: Collagen VI (COL6) mRNA was negatively correlated with AT pO2. Males are represented by squares and females by circles, filled with different colors as follows: white for lean, gray for O/O without type 2 diabetes, and black for O/O with type 2 diabetes. (Please see http://dx.doi.org/10.2337/db08-1098 for a high-quality digital representation of this figure.)CC BY-NC-ND · PubMed Central
FIG. 3. Hypoxia and AT inflammation. AT pO2 was inversely correlated with the inflammation markers CD68 mRNA (A) and MAC 2/CD163 mRNA (B), with the chemokine MIP1α mRNA expression (C) and MIP1α secretion into culture media ex vivo (D). Previous studies in our lab demonstrated a strong correlation between MAC2/CD163 and CD68 mRNA and macrophage infiltration by macrophage staining in AT sections by immunohistochemistry (R2 = 0.77, P < 0.001) (B. Kozak, J. Gimble, S.R. Smith, unpublished data). Males are represented by squares and females by circles, filled with different colors as follows: white for lean, gray for O/O without type 2 diabetes, and black for O/O with type 2 diabetes.
FIG. 3. Hypoxia and AT inflammation. AT pO2 was inversely correlated with the inflammation markers CD68 mRNA (A) and MAC 2/CD163 mRNA (B), with the chemokine MIP1α mRNA expression (C) and MIP1α secretion into culture media ex vivo (D). Previous studies in our lab demonstrated a strong correlation between MAC2/CD163 and CD68 mRNA and macrophage infiltration by macrophage staining in AT sections by immunohistochemistry (R2 = 0.77, P < 0.001) (B. Kozak, J. Gimble, S.R. Smith, unpublished data). Males are represented by squares and females by circles, filled with different colors as follows: white for lean, gray for O/O without type 2 diabetes, and black for O/O with type 2 diabetes.CC BY-NC-ND · PubMed Central

Verification

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Citations

Cites

Show all 46 references

Research works printed but not linked: 1

  1. Smith SR, Ravussin E: Role of Adipocyte in Metabolism and Endocrine Function. DeGroot, Jameson, Endocrinology, Philadelphia, Elsevier Saunders, 2006

Cited by

Sorted by citations

Related

See all

Metadata

Authors
Pasarica, M., Sereda, O. R., Redman, L. M., Albarado, D. C., Hymel, D. T., Roan, L. E., Rood, J. C., Burk, D. H., & Smith, S. R.
Affiliations
Pennington Biomedical Research Center (US)
ORCID
Venue
Diabetes
Publisher
American Diabetes Association
Published
2009-03-01
Volume
58
Issue
3
Pages
718-725
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
DOI
10.2337/db08-1098
PMC
PMC2646071
OpenAlex
W2171965603
Cited by
786
References
46
Citations by year
2026: 27 · 2025: 25 · 2024: 40 · 2023: 32 · 2022: 47 · 2021: 41 · 2020: 48 · 2019: 58 · 2018: 54 · 2017: 56 · 2016: 39 · 2015: 53 · 2014: 53 · 2013: 66 · 2012: 46
FWCI
25.07
Type
journal article
Language
en
Open access
Licence
cc-by-nc-nd
Locations
  • Diabetes (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Civil War Book Review (submittedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (DK072476, P30DK072476)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adipokines, Inflammation, and Metabolic Diseases
  • Health Sciences › Medicine › Physiology (medical) › Adipose Tissue and Metabolism
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Disease and Adiposity
Keywords
adipose tissue hypoxia, obesity, adipose tissue inflammation, macrophage infiltration, capillary density, vascular endothelial growth factor, PPARγ, collagen VI, CD68, macrophage inflammatory protein-1alpha, insulin sensitivity, adipose tissue vascularization
MeSH terms
Abdomen, Adipose Tissue, Hypoxia, Blood Pressure, Body Composition, Body Temperature, Female, Humans, Hyperinsulinism, Inflammation, Male, Obesity, Organ Size, Oxygen, Partial Pressure, Reference Values, Glucose Clamp Technique, Absorptiometry, Photon, Patient Selection, Reverse Transcriptase Polymerase Chain Reaction, Overweight

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review