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2000 Fiscal Year Final Research Report Summary

DEVELOPMENT OF RECONSTRUCTIVE SURGERY OF SOFT-TISSUES BY INJECTION OF BASEMENT MEMBRANE

Research Project

Project/Area Number 11694260
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Plastic surgery
Research InstitutionNAGOYA UNIVERSITY

Principal Investigator

TORII Shuhei  SCHOOL OF MEDICINE, NAGOYA UNIVERSITY, Professor, 医学部, 教授 (60115607)

Co-Investigator(Kenkyū-buntansha) TORIYAMA Kazuhiro  SCHOOL OF MEDICINE, NAGOYA UNIVERSITY, Assistant Professor, 医学部, 講師 (40314017)
KAMEI Yuzuru  SCHOOL OF MEDICINE, NAGOYA UNIVERSITY, Associate Professor, 医学部, 助教授 (10257678)
KITAGAWA Yasuo  BIO SCIENCE CENTER, NAGOYA UNIVERSITY Professor, 大学院・生命農学研究科, 教授 (50101168)
Project Period (FY) 1999 – 2000
Keywordssoft-tissues / adipose tissues / mesenchymal stem cells / basement membrane / capillary / Matrigel / hypoxia / type IV collagen
Research Abstract

Subcutaneous injection of reconstituted basement membrane (Matrigel) in combination with basic fibroblast growth factor induces de novo adipogenesis in which endogenous precursor cells invade the artificially formed Matrigel space, proliferate and differentiate to form adipose tissue. Since this adipogenesis offers us a novel approach for soft-tissue reconstruction without transplanting preadipocytes, the early process was examined by optical and electron microscopy. Formation of multiple layers of fibroblast-like cells at the surface of Matrigel implant was the first response of connective tissue. The cells within four to five layers proximal to Matrigel implant acquired a thick cytoplasm and an enlarged nucleus, and they invaded Matrigel space together with endothelial cells which caused neovascularization. Phagocytotic incorporation and digestion of Matrigel components by well-developed lysosomes appeared to be a stimulus of fibroblast-like cells to mature depending on proximity to Matrigel. The fibroblast-like cells often contacted to the outer surface of capillary over a large area with a distance of 0.2 to 0.5μm and rapidly accumulated lipid droplets. Electron microscopy of the developing adipocytes showed an well-organized smooth endoplasmic reticulum and mitochondria. This investigation thus revealed the characteristics of adipocyte precursor cells, which can be recruited for regenerative engineering of soft-tissues.
As an experimental model for the hypoxic modulation of collagen metabolism in peripheral tissues, we also cultured 3T3-L1 fibroblasts under low partial oxygen pressure and found that hypoxia enhances secretion of type IV collagen 10-fold and accelerates adipose conversion of the cells. The enhanced secretion of type IV collagen was not accompanied by appreciable increase of α1(IV) and α2(IV) mRNAs. Prolyl 4-hydroxylase α increased only 3-fold under hypoxia.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Mojgan Azimi,Tomoaki Niimi,Naoko Yoshida,Yasuo Kitagawa: "Differential expression of mRNAs encoding laminin chain variants during in vitro development of mouse blastocysts."Cytotechnology. 31. 183-191 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirotake Yamaguchi,Hironobu Yamashita,Hitoshi Mori,Ikuko Okazaki,Motoyoshi Nomizu,Konrad Beck,Yasuo Kitagawa: "High and low affinity heparin-binding sites in the G domain of the mouse laminin α4 chain."J.Biol.Chem.. 275. 29458-29465 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Chino Kumagai,Masaki Okano,Yasuo Kitagawa: "Tree heterotrimeric laminins produced by human keratinocytes."Cytotechnology. 33. 167-174 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鳥山和宏,川口信子: "脂肪の組織工学"医学のあゆみ. 196(5). 373-378 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kazuhiro Toriyama,Nobuko Kawaguchi,Junzo Kitoh,Rie Tajima,Kazuhiko Inou,Yasuo Kitagawa,and Shuhei Torii: "Endogenous adipocyte precursor cells for regenerative soft-tissue engineering."Tissue Engineering. (In press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Rie Tajima,Nobuko Kawaguchi,Yoko Horino,Yuji Takahashi,Kazuhiro Toriyama,Kazuhiko Inou,Yasuo kitagawa,Shuhei Torii,: "Hypoxic enhancement of type IV collagen secretion accelerates adipose conversion of 3T3-L1 cells."Biochim.Biophys.Acta. (印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Mojgan Azimi, Tomoaki Niimi, Naoko Yoshida, and Yasuo Kitagawa: "Differential expression of mRNAs encoding laminin chain variants during in vitro development of mouse blastocysts."Cytotechnology. 31. 183-191 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirotake Yamaguchi, Hironobu Yamashita, Hitoshi Mori, Ikuko Okazaki, Motoyoshi Nomizu, Konrad Beck, and Yasuo Kitagawa: "High and low affinity heparin-binding sites in the G domain of the mouse laminin α4 chain."J.Biol.Chem.. 275. 29458-29465 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Chino Kumagai, Masaki Okano, and Yasuo Kitagawa: "Tree heterotrimeric laminins produced by human keratinocytes."Cytotechnology. 33. 167-174 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kazuhiro Toriyama, Nobuko Kawaguchi: "Tissue engineering of adipocytes."IGAKUNOAYUMI. 196(5) (In Japanese). 373-378 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kazuhiro Toriyama, Nobuko Kawaguchi, Junzo Kitoh, Rie Tajima, Kazuhiko Inou, Yasuo Kitagwa, and Shuhei Toriyama: "Endogenous adipocyte precursor cells for regenerative soft-tissue engineering."Tissue Engineering. (In press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Rie Tajima, Nobuko Kawaguchi, Yoko Horino, Yuji Takahashi, Kazuhiro Toriyama, Kazuhiko Inou, Shuhei Torii, Yasuo Kitagwa: "Hypoxic enhancement of type IV collagen secretion accelerates adipose conversion of 3T3-L1 fibroblasts."Biochim.Biophys.Acta. (In press).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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