期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 284, 期 30, 页码 20136-20146出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M109.021881
关键词
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资金
- National Institutes of Health [R01 EY06819, EY15735]
- NEI
- TissueTech, Inc.
- Ocular Surface Research & Education Foundation, Miami, FL
- Medical Research Council [MC_U138274352] Funding Source: researchfish
- MRC [MC_U138274352] Funding Source: UKRI
Clinically, amniotic membrane (AM) suppresses inflammation, scarring, and angiogenesis. AM contains abundant hyaluronan (HA) but its function in exerting these therapeutic actions remains unclear. Herein, AM was extracted sequentially with buffers A, B, and C, or separately by phosphate-buffered saline (PBS) alone. Agarose gel electrophoresis showed that high molecular weight (HMW) HA (an average of similar to 3000 kDa) was predominantly extracted in isotonic Extract A (70.1 +/- 6.0%) and PBS (37.7 +/- 3.2%). Western blot analysis of these extracts with hyaluronidase digestion or NaOH treatment revealed that HMW HA was covalently linked with the heavy chains (HCs) of inter-alpha-inhibitor (I alpha I) via a NaOH-sensitive bond, likely transferred by the tumor necrosis factor-alpha stimulated gene-6 protein (TSG-6). This HC.HA complex (nHC.HA) could be purified from Extract PBS by two rounds of CsCl/guanidine HCl ultracentrifugation as well as in vitro reconstituted (rcHC.HA) by mixing HMW HA, serum I alpha I, and recombinant TSG-6. Consistent with previous reports, Extract PBS suppressed transforming growth factor-beta 1 promoter activation in corneal fibroblasts and induced macrophage apoptosis. However, these effects were abolished by hyaluronidase digestion or heat treatment. More importantly, the effects were retained in the nHC.HA or rcHC.HA. These data collectively suggest that the HC.HA complex is the active component in AM responsible in part for clinically observed anti-inflammatory and anti-scarring actions.
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