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2011 ; 15
(12
): 2569-74
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Telocytes are the common cell of origin of both PEComas and GISTs: an
evidence-supported hypothesis
#MMPMID21977985
Ardeleanu C
; Bussolati G
J Cell Mol Med
2011[Dec]; 15
(12
): 2569-74
PMID21977985
show ga
We advance the hypothesis that the telocyte might be the cell of origin of both
PEComas (perivascular epithelioid cell tumours) and GISTs (gastro-intestinal and
extra-gastrointestinal stromal tumours). The hypothesis is supported by data from
the literature reporting that both PEComas and GISTs, as well as telocytes, share
the expression of several markers. These data were supplemented by original
immunohistochemical tests on selected series. Specifically: (1) Melanoma markers
(Melan A, MiTF) typical of PEComas are expressed by a substantial fraction of
GISTs. A fraction of GISTs was also found positive for CD63, a tetraspanin
protein originally described in melanomas and marking exosomes. (2) c-KIT
(CD117), proper of the vast majority of GISTs, can be expressed by PEComas (as
well as by telocytes). (3) Markers described in telocytes (CD34, S-100, smooth
muscle actin and vascular endothelial growth factor) have been reported as
positive in cases of PEComas and GISTs. Telocytes show distinctive
ultrastructural features with thin, extended, telopodes and are likely involved
in inter-cellular signalling via paracrine secretion as well as by shed vesicles
and exosomes. These cells have been described in many locations (cavitary and
non-cavitary organs) and might display potentialities of a wide spectrum of
differentiation (and function). In conclusion we propose that telocytes could be
the common cells of origin for both PEComas and GISTs.