Article (Scientific journals)
Identification of factors that maintain mammalian outer hair cells in adult organ of Corti explants
Malgrange, Brigitte; Rigo, Jean-Michel; Coucke, Paul et al.
2002In Hearing Research, 170 (1-2), p. 48-58
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Keywords :
apoptosis; organ of Corti; outer hair cell; trophic factor; guinea pig
Abstract :
[en] Both outer hair cells (OHCs) and inner hair cells (IHCs) survive and mature in 3 days old rat organ of Corti explants cultured for I month in a minimal essential medium. In contrast. under the same culture conditions, only IHCs survive in explants from adult guinea pig organ of Corti while many of the OHCs are lost within the first 48 It. Hair cell Count,, show OHCs loss to be greater in the lower portion (i.e. middle turn) of the cochlea than Lit the apex. Terminal deoxynucleotidyl transferase-mediated dUTP nick end labelling (TUNEL) indicates that there is DNA damage in adult OHCs, within 8 h of explantation. Treatment of the adult organ of Corti explants with either actinomycin D (10(-7) M) or cycloheximide (10(-6) M) prevents most OHC losses . According to these results apoptosis may be the mechanism of OHC loss in adult organ of Corti explants, Stable membrane potentials recorded from the OHCs in both uncultured and actinomycin D-treated organ of Corti explants cultured for 72 h demonstrate the functional integrity of these hair cells. OHC losses in the adult guinea pig, organ of Corti cultures can also be prevented by treatment with several of the growth factors tested. i.e. acidic fibroblast growth factor (aFGF), insulin-like growth factor-1 (IGF-1), epidermal growth factor (EGF), transforming growth factor-beta1 (TGF-beta1). and glial cell-derived neurotrophic factor (GDNF). The results of this study suggest that growth factor therapy may be applicable to the treatment of some hearing disorders. (C) 2002 Elsevier Science B.V. All rights reserved.
Disciplines :
Otolaryngology
Anatomy (cytology, histology, embryology...) & physiology
Author, co-author :
Malgrange, Brigitte  ;  Université de Liège - ULiège > CNCM/ Centre fac. de rech. en neurobiologie cell. et moléc.
Rigo, Jean-Michel;  Universiteit Hasselt - UH
Coucke, Paul;  Université de Liège - ULiège > Département des sciences de la vie > Biologie cellulaire
Thiry, Marc  ;  Centre Hospitalier Universitaire de Liège - CHU > Anesthésie et réanimation
Hans, Grégory ;  Université de Liège - ULiège > Département des sciences cliniques > Neurologie
Nguyen, Laurent  
van de Water, Thomas R.;  Université de Liège - ULiège > Département des sciences cliniques > Neurologie - Doyen de la Faculté de Médecine
Moonen, Gustave  ;  Centre Hospitalier Universitaire de Liège - CHU > O.R.L.
Lefebvre, Philippe 
Language :
English
Title :
Identification of factors that maintain mammalian outer hair cells in adult organ of Corti explants
Publication date :
August 2002
Journal title :
Hearing Research
ISSN :
0378-5955
eISSN :
1878-5891
Publisher :
Elsevier Science Bv, Amsterdam, Netherlands
Volume :
170
Issue :
1-2
Pages :
48-58
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 28 January 2009

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