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2015 ; 125
(10
): 1623-32
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Defective release of ? granule and lysosome contents from platelets in mouse
Hermansky-Pudlak syndrome models
#MMPMID25477496
Meng R
; Wu J
; Harper DC
; Wang Y
; Kowalska MA
; Abrams CS
; Brass LF
; Poncz M
; Stalker TJ
; Marks MS
Blood
2015[Mar]; 125
(10
): 1623-32
PMID25477496
show ga
Hermansky-Pudlak syndrome (HPS) is characterized by oculocutaneous albinism,
bleeding diathesis, and other variable symptoms. The bleeding diathesis has been
attributed to ? storage pool deficiency, reflecting the malformation of platelet
dense granules. Here, we analyzed agonist-stimulated secretion from other storage
granules in platelets from mouse HPS models that lack adaptor protein (AP)-3 or
biogenesis of lysosome-related organelles complex (BLOC)-3 or BLOC-1. We show
that ? granule secretion elicited by low agonist doses is impaired in all 3 HPS
models. High agonist doses or supplemental adenosine 5'-diphosphate (ADP)
restored normal ? granule secretion, suggesting that the impairment is secondary
to absent dense granule content release. Intravital microscopy following
laser-induced vascular injury showed that defective hemostatic thrombus formation
in HPS mice largely reflected reduced total platelet accumulation and affirmed a
reduced area of ? granule secretion. Agonist-induced lysosome secretion ex vivo
was also impaired in all 3 HPS models but was incompletely rescued by high
agonist doses or excess ADP. Our results imply that (1) AP-3, BLOC-1, and BLOC-3
facilitate protein sorting to lysosomes to support ultimate secretion; (2)
impaired secretion of ? granules in HPS, and to some degree of lysosomes, is
secondary to impaired dense granule secretion; and (3) diminished ? granule and
lysosome secretion might contribute to pathology in HPS.
|Adaptor Protein Complex 3/deficiency/genetics/physiology
[MESH]