• Ei tuloksia

The  main  findings  of  this  thesis  are:  

Active   hyaluronan   synthesis   relocates   filamentous   actin   to   the   cell   cortex   and   apical  filopodia,  thus  regulating  plasma  membrane  and  actin  dynamics  

A   thick   hyaluronan   coat   acts   like   an   extracellular   cytoskeleton   in   order   to   maintain  the  long  and  dynamic  apical  filopodia  with  only  approximately  8  actin   filaments  

Hyaluronan  production  is  required  for,  and  supported  by,  the  apical  filopodia     Mesothelial   plasma   membrane   protrusions   and   the   HAS-­‐‑induced   plasma   membrane   protrusions   are   ultrastructurally   similar,   suggesting   that   the   hyaluronan-­‐‑positive  protrusions  in  the  mesothelium  represent  apical  filopodia  in   vivo  

Hyaluronan   synthesis   is   associated   with   microvesicle   formation   and   the   HAS-­‐‑

induced   apical   filopodia   act   as   a   platform   for   the   budding   of   the   hyaluronan   coated  microvesicles  

EMT   is   associated   with   the   activation   of   the   hyaluronan   synthesis   machinery,   apical  filopodia  and  microvesicle  formation  

In  the  future,  the  role  of  the  actin  binding  proteins  in  the  formation  of  the  HAS-­‐‑induced     apical   filopodia   should   be   studied   in   more   detail.   Increased   hyaluronan   production   and   actin  binding  proteins  such  as  ezrin  and  fascin  are  associated  with  cancer  progression.  It  is   possible   that   the   HAS-­‐‑induced   apical   filopodia   have   a   role   in   cancer   invasion   and   metastasis.  Thus,  their  detailed  investigation  may  reveal  new  targets  for  cancer  treatment.  

Myo10   was   shown   to   specifically   localize   on   the   tips   of   the   HAS-­‐‑induced   apical   filopodia,  but  it  is  not  required  for  their  formation.  Myo10  may  function  as  a  cargo  carrier,   and  be  involved  in  the  formation  of  the  bulbous  expansion    (Rilla  and  Koistinen  2015)  at  the   tip.  Therefore,  Myo10  may  have  a  role  in  microvesicle  formation.  

In  this  thesis,  it  was  shown  that  normal  mesothelium  in  vivo  is  positive  for  hyaluronan   and  all  of  its  synthases,  but  negative  for  CD44.  We  do  not,  however,  know  if  the  mesothelial   cell   protrusions   are   dependent   on   hyaluronan-­‐‑like   HAS-­‐‑induced   protrusions.   Knockout   animals   would   be   potential   tools   to   investigate   the   role   of   the   different   HASes   in   the   filopodia  in  vivo.  

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