Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=28301521
&cmd=llinks): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests
in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 215
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\28301521
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+One
2017 ; 12
(3
): e0173771
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Lysosomal adaptation: How cells respond to lysosomotropic compounds
#MMPMID28301521
Lu S
; Sung T
; Lin N
; Abraham RT
; Jessen BA
PLoS One
2017[]; 12
(3
): e0173771
PMID28301521
show ga
Lysosomes are acidic organelles essential for degradation and cellular
homoeostasis and recently lysosomes have been shown as signaling hub to respond
to the intra and extracellular changes (e.g. amino acid availability). Compounds
including pharmaceutical drugs that are basic and lipophilic will become
sequestered inside lysosomes (lysosomotropic). How cells respond to the lysosomal
stress associated with lysosomotropism is not well characterized. Our goal is to
assess the lysosomal changes and identify the signaling pathways that involve in
the lysosomal changes. Eight chemically diverse lysosomotropic drugs from
different therapeutic areas were subjected to the evaluation using the human
adult retinal pigmented epithelium cell line, ARPE-19. All lysosomotropic drugs
tested triggered lysosomal activation demonstrated by increased lysosotracker red
(LTR) and lysosensor green staining, increased cathepsin activity, and increased
LAMP2 staining. However, tested lysosomotropic drugs also prompted lysosomal
dysfunction exemplified by intracellular and extracellular substrate accumulation
including phospholipid, SQSTM1/p62, GAPDH (Glyceraldehyde 3-phosphate
dehydrogenase) and opsin. Lysosomal activation observed was likely attributed to
lysosomal dysfunction, leading to compensatory responses including nuclear
translocation of transcriptional factors TFEB, TFE3 and MITF. The adaptive
changes are protective to the cells under lysosomal stress. Mechanistic studies
implicate calcium and mTORC1 modulation involvement in the adaptive changes.
These results indicate that lysosomotropic compounds could evoke a compensatory
lysosomal biogenic response but with the ultimate consequence of lysosomal
functional impairment. This work also highlights a pathway of response to
lysosomal stress and evidences the role of TFEB, TFE3 and MITF in the stress
response.