Inhibition of mTOR delayed but could not prevent experimental collapsing focal segmental glomerulosclerosis
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Inhibition of mTOR delayed but could not prevent experimental collapsing focal segmental glomerulosclerosis. / Miesen, Laura; Eymael, Jennifer; Sharma, Shagun; Loeven, Markus A; Willemsen, Brigith; Bakker-van Bebber, Marinka; Mooren, Fieke; Meyer-Schwesinger, Catherine; Dijkman, Henry; Wetzels, Jack F M; Jansen, Jitske; van der Vlag, Johan; Smeets, Bart.
in: SCI REP-UK, Jahrgang 10, Nr. 1, 22.05.2020, S. 8580.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Inhibition of mTOR delayed but could not prevent experimental collapsing focal segmental glomerulosclerosis
AU - Miesen, Laura
AU - Eymael, Jennifer
AU - Sharma, Shagun
AU - Loeven, Markus A
AU - Willemsen, Brigith
AU - Bakker-van Bebber, Marinka
AU - Mooren, Fieke
AU - Meyer-Schwesinger, Catherine
AU - Dijkman, Henry
AU - Wetzels, Jack F M
AU - Jansen, Jitske
AU - van der Vlag, Johan
AU - Smeets, Bart
PY - 2020/5/22
Y1 - 2020/5/22
N2 - Anti-Thy1.1 transgenic mice develop glomerular lesions that mimic collapsing focal segmental glomerulosclerosis (FSGS) in humans with collapse of the glomerular tuft and marked hyperplasia of the parietal epithelial cells (PECs). Immunostaining of phosphor-S6 ribosomal protein (pS6RP) revealed high mTOR activity in PECs of the FSGS lesions of these mice. In this study we questioned whether the mTOR inhibitor rapamycin (sirolimus) could attenuate the development and progression of glomerulosclerotic lesions in the anti-Thy1.1 transgenic mice. We observed reduced mTOR signalling and proliferation in human parietal epithelial cells after rapamycin treatment. Experiments with anti-Thy1.1. mice showed that early treatment with sirolimus reduced the development of glomerular lesions and glomerular cell proliferation at day 4. Levels of albuminuria, podocyte injury and podocyte number were similar in the sirolimus and vehicle treated groups. The initial beneficial effects of sirolimus treatment were not observed at day 7. Late sirolimus treatment did not reduce albuminuria or the progression of glomerulosclerosis. Taken together, rapamycin attenuated PEC proliferation and the formation of early FSGS lesions in experimental FSGS and reduced human PEC proliferation in vitro. However, the initial inhibition of PEC proliferation did not translate into a decline of albuminuria nor in a sustained reduction in sclerotic lesions.
AB - Anti-Thy1.1 transgenic mice develop glomerular lesions that mimic collapsing focal segmental glomerulosclerosis (FSGS) in humans with collapse of the glomerular tuft and marked hyperplasia of the parietal epithelial cells (PECs). Immunostaining of phosphor-S6 ribosomal protein (pS6RP) revealed high mTOR activity in PECs of the FSGS lesions of these mice. In this study we questioned whether the mTOR inhibitor rapamycin (sirolimus) could attenuate the development and progression of glomerulosclerotic lesions in the anti-Thy1.1 transgenic mice. We observed reduced mTOR signalling and proliferation in human parietal epithelial cells after rapamycin treatment. Experiments with anti-Thy1.1. mice showed that early treatment with sirolimus reduced the development of glomerular lesions and glomerular cell proliferation at day 4. Levels of albuminuria, podocyte injury and podocyte number were similar in the sirolimus and vehicle treated groups. The initial beneficial effects of sirolimus treatment were not observed at day 7. Late sirolimus treatment did not reduce albuminuria or the progression of glomerulosclerosis. Taken together, rapamycin attenuated PEC proliferation and the formation of early FSGS lesions in experimental FSGS and reduced human PEC proliferation in vitro. However, the initial inhibition of PEC proliferation did not translate into a decline of albuminuria nor in a sustained reduction in sclerotic lesions.
KW - Albuminuria/drug therapy
KW - Animals
KW - Cell Proliferation
KW - Glomerulosclerosis, Focal Segmental/drug therapy
KW - Humans
KW - Immunosuppressive Agents/pharmacology
KW - Male
KW - Mice
KW - Mice, Inbred C57BL
KW - Mice, Transgenic
KW - Sclerosis/drug therapy
KW - Signal Transduction
KW - Sirolimus/pharmacology
KW - TOR Serine-Threonine Kinases/antagonists & inhibitors
KW - Thy-1 Antigens/physiology
U2 - 10.1038/s41598-020-65352-y
DO - 10.1038/s41598-020-65352-y
M3 - SCORING: Journal article
C2 - 32444668
VL - 10
SP - 8580
JO - SCI REP-UK
JF - SCI REP-UK
SN - 2045-2322
IS - 1
ER -