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Regulasi Adipogenesis oleh mTORC1 melalui Jalur ST A T3

Triawanti Triawanti, M Rasjad Indra, Askandar Tjokroprawiro, Hidayat Sujuti
  Jurnal Kedokteran Brawijaya, Vol 27, No 3 (2013),  pp.123-130  

Abstract


Obesitas  merupakan  suatu  penyakit  kelebihan  massa  lemak  tubuh  yang  mempunyai  efek  merugikan  bagi  kesehatan.  Pada saat  ini  proses  adipogenesis  menjadi salah  satu  target  terapi  obesitas.  Salah  satu  jalur  yang  diduga  teraktivasi  pada  proses adipogenesis  adalah  melalui aktivasi  ST A T3  yang  salah  satu  jalur  hulunya  melalui protein  mammalian target  of rapamycin complex 1 (mTOR). Penelitian ini bertujuan untuk membuktikan proses adipogenesis melalui jalur ST A T3 yang diaktivasi oleh  mTORC1.  Penelitian  ini  merupakan  penelitian  eksperimental  dengan  rancangan  post  test  only  control.  Untuk penghambatan  mTORC1  digunakan  rapamycin  dan  penghambatan  ST A T3  digunakan  inhibitor  ST A T3  peptide.  Subjek penelitian  adalah  kultur  primer  sel  preadiposit  yang  diambil  dari  lemak  viseral  tikus  putih  Rattus  norvegicus.  Setelah  kultur sel preadiposit dinilai konfluen minimal 70-80% dilakukan induksi diferensiasi dan dibagi menjadi  4 kelompok yakni (K) kontrol  (A):   diberi rapamycin  10  nM,  (B):  diberi  inhibitor  ST A T3  100  µM (C):  diberi  inhibitor  ST A T3  100  µM dan   rapamycin10  nM.  Parameter  yang  diukur  adalah  aktivasi  p70S6K1,  ST A T3,  ekspresi  C/EBPδ,  aktivitas  enzim  Glyserol-3-fosfodehidrogenase  (GPDH)  pada  hari  ke-2,  ke-4  dan  ke-6  serta  gambaran  morfologis  sel  adiposit.  Analisis  statistik menggunakan uji ANOVA, Duncan dan korelasi Pearson dengan tingkat kepercayaan 95%. Hasil penelitian membuktikan terjadi  penghambatan  proses  adipogenesis  karena  penghambatan  aktivasi  p70S6K1,  dan  ST A T3  oleh  rapamycin  dan inhibitor ST A T3.

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DOI: http://dx.doi.org/10.21776/ub.jkb.2013.027.03.1

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