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Obesity Increases Circulating Endothelial Progenitor Cells in Human and Mouse
Pregnancy.
Julia Gefter, PhD.* 1,2
, Marlise F. Snyder 1
, Robert W. Powers, PhD 1,2
, and Carl A. Hubel, PhD.
1,2
Department of Obstetrics, Gynecology, Reproductive Sciences 1
Magee-Womens Research Institute 2
University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
Context: Endothelial progenitor cells (EPCs) are bone marrow-derived cells that enter the
systemic circulation to replace defective or injured mature endothelial cells. We have previously
reported significantly elevated circulating EPCs in human and mouse pregnancy. Patients with
reduced or undetectable EPCs are at increased risk of endothelial dysfunction and
cardiovascular disease. Obesity is associated with an increased risk of cardiovascular disease.
We hypothesized that EPCs would be significantly lower in obese pregnant women.
Objective: The objective of this study was to quantify circulating EPCs in lean and obese
pregnant women and mice.
Study Design: EPCs were quantified from whole blood by flow cytometry from 8 lean (BMI=
23.1±1.9 kg/m2
) and 8 obese (BMI= 34.7±5.7 kg/m2
) pregnant women collected in the first
trimester (average 11 weeks gestation). EPCs were also quantified in whole blood from 4 lean
and 9 high fat diet-induced obese pregnant mice. EPCs in human samples were identified as
circulating angiogenic cells (CACs) 1. CD117+/CD34+, 2. CD133+/CD34+, 3.
CD45dim/CD34+/CD31+/CD133+, and 4. CD45dim/CD34+/CD133+. EPCs in mouse samples
were identified CD45-/ sca1+/ Flk1+ and CD45-/CD34+/Flk1+, and were quantified per blood
volume. Statistical analysis was by Wilcoxin rank sum.
Results: Circulating EPCs were significantly elevated in obese pregnant women compared to
lean pregnant women (Table), and obese pregnant mice compared to lean mice (p<0.01).
Conclusion: Contrary to our hypothesis, circulating EPCs were significantly elevated in obese
pregnant women and high fat diet-induced obese pregnant mice. While pregnancy increases
circulating EPCs, obesity appears to further increase circulating EPCs, however it is unclear if
these cells are functioning appropriately. (not the case to think that further stress from wt. calls
for more EPCs?...)
Circulating EPCs Lean (n=8) Obese (n=8)
CD117+/CD34+ 460 (290,822) 667 (522,757)
CD133+/CD34+ 1078 (700,1889) 2175 (1398,2908)
CD45dim/CD34+/CD31+/CD133+ 1329 (729,1670) 1907 (1608,2748)
CD45dim/CD34+/CD133+ 1323 (729,1670) 1907 (1590,2940)
Data are median (interquartile range); *: p<0.05 compared to lean.(no difference?)
This project supported by National Institutes of Health grants P01-HD30367 and R01-
HL091094.

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Abstract - SGI EPC 10-2012

  • 1. Obesity Increases Circulating Endothelial Progenitor Cells in Human and Mouse Pregnancy. Julia Gefter, PhD.* 1,2 , Marlise F. Snyder 1 , Robert W. Powers, PhD 1,2 , and Carl A. Hubel, PhD. 1,2 Department of Obstetrics, Gynecology, Reproductive Sciences 1 Magee-Womens Research Institute 2 University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA Context: Endothelial progenitor cells (EPCs) are bone marrow-derived cells that enter the systemic circulation to replace defective or injured mature endothelial cells. We have previously reported significantly elevated circulating EPCs in human and mouse pregnancy. Patients with reduced or undetectable EPCs are at increased risk of endothelial dysfunction and cardiovascular disease. Obesity is associated with an increased risk of cardiovascular disease. We hypothesized that EPCs would be significantly lower in obese pregnant women. Objective: The objective of this study was to quantify circulating EPCs in lean and obese pregnant women and mice. Study Design: EPCs were quantified from whole blood by flow cytometry from 8 lean (BMI= 23.1±1.9 kg/m2 ) and 8 obese (BMI= 34.7±5.7 kg/m2 ) pregnant women collected in the first trimester (average 11 weeks gestation). EPCs were also quantified in whole blood from 4 lean and 9 high fat diet-induced obese pregnant mice. EPCs in human samples were identified as circulating angiogenic cells (CACs) 1. CD117+/CD34+, 2. CD133+/CD34+, 3. CD45dim/CD34+/CD31+/CD133+, and 4. CD45dim/CD34+/CD133+. EPCs in mouse samples were identified CD45-/ sca1+/ Flk1+ and CD45-/CD34+/Flk1+, and were quantified per blood volume. Statistical analysis was by Wilcoxin rank sum. Results: Circulating EPCs were significantly elevated in obese pregnant women compared to lean pregnant women (Table), and obese pregnant mice compared to lean mice (p<0.01). Conclusion: Contrary to our hypothesis, circulating EPCs were significantly elevated in obese pregnant women and high fat diet-induced obese pregnant mice. While pregnancy increases circulating EPCs, obesity appears to further increase circulating EPCs, however it is unclear if these cells are functioning appropriately. (not the case to think that further stress from wt. calls for more EPCs?...) Circulating EPCs Lean (n=8) Obese (n=8) CD117+/CD34+ 460 (290,822) 667 (522,757) CD133+/CD34+ 1078 (700,1889) 2175 (1398,2908) CD45dim/CD34+/CD31+/CD133+ 1329 (729,1670) 1907 (1608,2748) CD45dim/CD34+/CD133+ 1323 (729,1670) 1907 (1590,2940) Data are median (interquartile range); *: p<0.05 compared to lean.(no difference?) This project supported by National Institutes of Health grants P01-HD30367 and R01- HL091094.