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Production of interleukin 1 from macrophages incubated with poly (DL-lactic acid) granules containing ovalbumin
Abstract:
The production profile of interleukin 1 (IL-1) from mouse peritoneal macrophages (M phi) was determined following their incubation with poly(DL-lactic acid) (PDLLA) granules containing ovalbumin (OVA). Upon incubation, M phi produced IL-1 at a significantly high rate compared with those incubated with OVA in the free form or OVA-free granules. A simple mixture of empty granules and free OVA exhibited the same level of IL-1 production as induced by free OVA alone. IL-1 production by the granules with a fixed OVA loading increased with an increase in their amount added to M phi. When incubated with a fixed amount of granules containing OVA of different loadings, M phi produced more IL-1 with an increase in the total OVA amount, but the IL-1 production decreased at OVA loadings higher than 10%. The presence of free OVA enhanced IL-1 production with the increased addition of empty granules, but the level induced by OVA loaded in granules was higher than that by mixtures of free OVA and empty granules, when compared at a similar OVA dose, irrespective of the absolute amount of PDLLA added. These findings indicate that the sustained release of OVA from the granules is critical to enhance the OVA-induced IL-1 production, in contrast to the OVA release accompanying a large initial burst, which reduced IL-1 production. It was concluded that the direct contact of PDLLA granules with M phi and the subsequent sustained release of OVA around M phi effectively activated M phi, resulting in enhanced IL-1 production.
Insights
Poly(DL-lactic acid) granules loaded with ovalbumin significantly enhance interleukin-1 production by macrophages. Sustained release of ovalbumin from these nanoparticles is key for effective immune activation.
Area of Science:
- Biomaterials Science
- Immunology
- Drug Delivery Systems
Background:
- Macrophages are key immune cells involved in inflammatory responses.
- Poly(DL-lactic acid) (PDLLA) is a biodegradable polymer used in drug delivery.
- Interleukin-1 (IL-1) is a critical cytokine in immune regulation and inflammation.
Purpose of the Study:
- To investigate the effect of PDLLA granules containing ovalbumin (OVA) on IL-1 production by mouse peritoneal macrophages.
- To determine the role of OVA loading and release kinetics from PDLLA granules in modulating macrophage activation.
Main Methods:
- Incubation of mouse peritoneal macrophages with PDLLA granules loaded with OVA under various conditions.
- Quantification of IL-1 production using cell culture assays.
- Analysis of IL-1 production in response to different concentrations and loadings of OVA and PDLLA granules.
Main Results:
- PDLLA granules with OVA significantly increased IL-1 production compared to free OVA or OVA-free granules.
- IL-1 production increased with higher amounts of OVA-loaded granules but decreased at OVA loadings above 10%.
- Sustained OVA release from granules, rather than a rapid burst release, was crucial for enhanced IL-1 production.
Conclusions:
- Direct contact between PDLLA granules and macrophages, coupled with sustained OVA release, effectively activates macrophages.
- PDLLA nanoparticles can be utilized to enhance immune responses through controlled delivery of antigens like OVA.
- The study highlights the importance of release kinetics from biodegradable carriers for modulating immune cell activation.