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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 Biochem+Biophys+Rep
2017 ; 11
(ä): 161-173
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An evolutionary perspective on the role of mesencephalic astrocyte-derived
neurotrophic factor (MANF): At the crossroads of poriferan innate immune and
apoptotic pathways
#MMPMID28955781
Sereno D
; Müller WEG
; Bausen M
; Elkhooly TA
; Markl JS
; Wiens M
Biochem Biophys Rep
2017[Sep]; 11
(ä): 161-173
PMID28955781
show ga
The mesencephalic astrocyte-derived neurotrophic factor (MANF) belongs to a
recently discovered family of neurotrophic factors. MANF can be secreted but is
generally resident within the endoplasmic reticulum (ER) in neuronal and
non-neuronal cells, where it is involved in the ER stress response with
pro-survival effects. Here we report the discovery of the MANF homolog SDMANF in
the sponge Suberites domuncula. The basal positioning of sponges (phylum
Porifera) in the animal tree of life offers a unique vantage point on the early
evolution of the metazoan-specific genetic toolkit and molecular pathways. Since
sponges lack a conventional nervous system, SDMANF presents an enticing
opportunity to investigate the evolutionary ancient role of these neurotrophic
factors. SDMANF shares considerable sequence similarity with its metazoan
homologs. It also comprises a putative protein binding domain with sequence
similarities to the Bcl-2 family of apoptotic regulators. In Suberites, SDMANF is
expressed in the vicinity of bacteriocytes, where it co-localizes with the
toll-like receptor SDTLR. In transfected human cells, SDMANF was detected in both
the organelle protein fraction and the cell culture medium. The intracellular
SDMANF protein level was up-regulated in response to both a Golgi/ER transport
inhibitor and bacterial lipopolysaccharides (LPS). Upon LPS challenge,
transfected cells revealed a decreased caspase-3 activity and increased cell
viability with no inducible Bax expression compared to the wild type. These
results suggest a deep evolutionary original cytoprotective role of MANF, at the
crossroads of innate immune and apoptotic pathways, of which a neurotrophic
function might have arisen later in metazoan evolution.