期刊
BLOOD
卷 125, 期 10, 页码 1623-1632出版社
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2014-07-586727
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资金
- National Institutes of Health National Eye Institute [R01 EY015625]
- National Heart, Lung, and Blood Institute [R01HL121323, R01 HL119070, R01 HL040387, P01 HL110860, R01 HL120846]
- National Institute of Diabetes and Digestive and Kidney Diseases [P30 DK090969]
- American Heart Association Research Grant [11SDG5720011, 10POST3870044]
Hermansky-Pudlak syndrome (HPS) is characterized by oculocutaneous albinism, bleeding diathesis, and other variable symptoms. The bleeding diathesis has been attributed to delta 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 alpha 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 alpha 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 alpha 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 alpha granules in HPS, and to some degree of lysosomes, is secondary to impaired dense granule secretion; and (3) diminished alpha granule and lysosome secretion might contribute to pathology in HPS.
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