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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Pathol
2016 ; 186
(7
): 1825-1836
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Evidence Supporting a Lymphatic Endothelium Origin for Angiomyolipoma, a TSC2(-)
Tumor Related to Lymphangioleiomyomatosis
#MMPMID27289491
Yue M
; Pacheco G
; Cheng T
; Li J
; Wang Y
; Henske EP
; Schuger L
Am J Pathol
2016[Jul]; 186
(7
): 1825-1836
PMID27289491
show ga
Angiomyolipoma (AML) is a tumor closely related to lymphangioleiomyomatosis
(LAM). Both entities are characterized by the proliferation of smooth muscle
actin and melanocytic glycoprotein 100 (recognized by antibody HMB-45)-positive
spindle-shaped and epithelioid cells. AML and LAM are etiologically linked to
mutations in the tsc2 and tsc1 genes in the case of LAM. These genes encode the
proteins tuberous sclerosis complex (TSC)-1 and TSC2, which are directly involved
in suppressing the mechanistic target of rapamycin cell growth signaling pathway.
Although significant progress has been made in characterizing and
pharmacologically slowing the progression of AML and LAM with rapamycin, our
understanding of their pathogenesis lacks an identified cell of origin. We used
an AML-derived cell line to determine whether TSC2 restitution brings about the
cell type from which AML arises. We found that AML cells express lymphatic
endothelial cell markers consistent with lymphatic endothelial cell precursors
in vivo and in vitro. Moreover, on TSC2 correction, AML cells mature into adult
lymphatic endothelial cells and have functional attributes characteristic of this
cell lineage, suggesting a lymphatic endothelial cell of origin for AML. These
effects are dependent on TSC2-mediated mechanistic target of rapamycin
inactivation. Finally, we demonstrate the in vitro effectiveness of
norcantharidin, a lymphangiogenesis inhibitor, as a potential co-adjuvant therapy
in the treatment of AML.