ATP Induces IL-1β Secretion in Neisseria gonorrhoeae-Infected Human Macrophages by a Mechanism Not Related to the NLRP3/ASC/Caspase-1 Axis

• Main Authors: Killen García (Author), Gisselle Escobar (Author), Pablo Mendoza (Author), Caroll Beltran (Author), Claudio Perez (Author), Sergio Arancibia (Author), Rolando Vernal (Author), Paula I. Rodas (Author), Claudio Acuña-Castillo (Author), Alejandro Escobar (Author)
• Format: Book
• Published: Hindawi Limited, 2016-01-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.

Summary

Neisseria gonorrhoeae (Ngo) has developed multiple immune evasion mechanisms involving the innate and adaptive immune responses. Recent findings have reported that Ngo reduces the IL-1β secretion of infected human monocyte-derived macrophages (MDM). Here, we investigate the role of adenosine triphosphate (ATP) in production and release of IL-1β in Ngo-infected MDM. We found that the exposure of Ngo-infected MDM to ATP increases IL-1β levels about ten times compared with unexposed Ngo-infected MDM (P<0.01). However, we did not observe any changes in inflammasome transcriptional activation of speck-like protein containing a caspase recruitment domain (CARD) (ASC, P>0.05) and caspase-1 (CASP1, P>0.05). In addition, ATP was not able to modify caspase-1 activity in Ngo-infected MDM but was able to increase pyroptosis (P>0.01). Notably ATP treatment defined an increase of positive staining for IL-1β with a distinctive intracellular pattern of distribution. Collectively, these data demonstrate that ATP induces IL-1β secretion by a mechanism not related to the NLRP3/ASC/caspase-1 axis and likely is acting at the level of vesicle trafficking or pore formation.

Item Description

0962-9351
1466-1861
10.1155/2016/1258504