TNFα release by the nonfat cells of human adipose tissue

J. N. Fain, Suleiman Bahouth, A. K. Madan

Research output: Contribution to journalArticle

133 Citations (Scopus)

Abstract

OBJECTIVE: The primary aim was to investigate the relative importance of the adipocytes vs the nonfat cells present in human adipose tissue with respect to release of immunoreactive tumor necrosis factor-α (TNFα). The second aim was to examine the correlation between body mass index (BMI) and the subsequent release of adiponectin and TNFα by explants of human subcutaneous and visceral adipose tissue incubated in primary culture for 48 h. RESULTS: We found that the maximal release of TNFα was seen during the first 4 h of a 48-h incubation by explants of human adipose tissue in primary culture. Over 95% of the TNFα released to the medium by human adipose tissue explants over a 4-h incubation came from the nonfat cells present in the adipose tissue. The release of TNFα by the nonfat cells released during collagenase digestion was slightly higher than that by the cells present in the adipose tissue matrix after collagenase digestion. TNFα release by the combined matrix and isolated nonfat cells was greater than that by explants of tissue indicating some upregulation induced by collagenase digestion. Immunoreactive TNFα disappeared from the medium with a half-time of approximately 10 h. There was a positive correlation coefficient of 0.79 between TNFα release by tissue explants and the BMI of the fat donors as well as a correlation of 0.52 between BMI and release by adipocytes. TNFα release negatively correlated [-0.60] with adiponectin release by adipose tissue. The release of TNFα was far less than that of adiponectin or IL-6, and less than that of plasminogen activator inhibitor-1, hepatocyte growth factor, or leptin over a 4-h incubation of human adipose tissue explants. TNFα release over 4 h was enhanced by lipopolysaccharide and inhibited by a cyclooxygenase-2 inhibitor. CONCLUSION: The release of TNFα by adipose tissue of obese humans is primarily due to the nonfat cells present in adipose tissue. TNFα is a short-lived adipokine whose release by human adipose tissue in primary culture correlates with the BMI of the fat donors.

Original languageEnglish (US)
Pages (from-to)616-622
Number of pages7
JournalInternational Journal of Obesity
Volume28
Issue number4
DOIs
StatePublished - Apr 1 2004

Fingerprint

tumor necrosis factors
adipose tissue
Adipose Tissue
Tumor Necrosis Factor-alpha
explants
cells
Adiponectin
adiponectin
collagenase
body mass index
Body Mass Index
Collagenases
Digestion
digestion
Adipocytes
adipocytes
Fats
hepatocyte growth factor
adipokines
Adipokines

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Public Health, Environmental and Occupational Health
  • Endocrinology
  • Food Science
  • Endocrinology, Diabetes and Metabolism

Cite this

TNFα release by the nonfat cells of human adipose tissue. / Fain, J. N.; Bahouth, Suleiman; Madan, A. K.

In: International Journal of Obesity, Vol. 28, No. 4, 01.04.2004, p. 616-622.

Research output: Contribution to journalArticle

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abstract = "OBJECTIVE: The primary aim was to investigate the relative importance of the adipocytes vs the nonfat cells present in human adipose tissue with respect to release of immunoreactive tumor necrosis factor-α (TNFα). The second aim was to examine the correlation between body mass index (BMI) and the subsequent release of adiponectin and TNFα by explants of human subcutaneous and visceral adipose tissue incubated in primary culture for 48 h. RESULTS: We found that the maximal release of TNFα was seen during the first 4 h of a 48-h incubation by explants of human adipose tissue in primary culture. Over 95{\%} of the TNFα released to the medium by human adipose tissue explants over a 4-h incubation came from the nonfat cells present in the adipose tissue. The release of TNFα by the nonfat cells released during collagenase digestion was slightly higher than that by the cells present in the adipose tissue matrix after collagenase digestion. TNFα release by the combined matrix and isolated nonfat cells was greater than that by explants of tissue indicating some upregulation induced by collagenase digestion. Immunoreactive TNFα disappeared from the medium with a half-time of approximately 10 h. There was a positive correlation coefficient of 0.79 between TNFα release by tissue explants and the BMI of the fat donors as well as a correlation of 0.52 between BMI and release by adipocytes. TNFα release negatively correlated [-0.60] with adiponectin release by adipose tissue. The release of TNFα was far less than that of adiponectin or IL-6, and less than that of plasminogen activator inhibitor-1, hepatocyte growth factor, or leptin over a 4-h incubation of human adipose tissue explants. TNFα release over 4 h was enhanced by lipopolysaccharide and inhibited by a cyclooxygenase-2 inhibitor. CONCLUSION: The release of TNFα by adipose tissue of obese humans is primarily due to the nonfat cells present in adipose tissue. TNFα is a short-lived adipokine whose release by human adipose tissue in primary culture correlates with the BMI of the fat donors.",
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N2 - OBJECTIVE: The primary aim was to investigate the relative importance of the adipocytes vs the nonfat cells present in human adipose tissue with respect to release of immunoreactive tumor necrosis factor-α (TNFα). The second aim was to examine the correlation between body mass index (BMI) and the subsequent release of adiponectin and TNFα by explants of human subcutaneous and visceral adipose tissue incubated in primary culture for 48 h. RESULTS: We found that the maximal release of TNFα was seen during the first 4 h of a 48-h incubation by explants of human adipose tissue in primary culture. Over 95% of the TNFα released to the medium by human adipose tissue explants over a 4-h incubation came from the nonfat cells present in the adipose tissue. The release of TNFα by the nonfat cells released during collagenase digestion was slightly higher than that by the cells present in the adipose tissue matrix after collagenase digestion. TNFα release by the combined matrix and isolated nonfat cells was greater than that by explants of tissue indicating some upregulation induced by collagenase digestion. Immunoreactive TNFα disappeared from the medium with a half-time of approximately 10 h. There was a positive correlation coefficient of 0.79 between TNFα release by tissue explants and the BMI of the fat donors as well as a correlation of 0.52 between BMI and release by adipocytes. TNFα release negatively correlated [-0.60] with adiponectin release by adipose tissue. The release of TNFα was far less than that of adiponectin or IL-6, and less than that of plasminogen activator inhibitor-1, hepatocyte growth factor, or leptin over a 4-h incubation of human adipose tissue explants. TNFα release over 4 h was enhanced by lipopolysaccharide and inhibited by a cyclooxygenase-2 inhibitor. CONCLUSION: The release of TNFα by adipose tissue of obese humans is primarily due to the nonfat cells present in adipose tissue. TNFα is a short-lived adipokine whose release by human adipose tissue in primary culture correlates with the BMI of the fat donors.

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