Abstract
Schinus terebinthifolia leaf lectin (SteLL) was reported to be an antimicrobial and antitumor agent. In this work, we evaluated the immunomodulatory activity of SteLL on mice splenocytes and also determined its native molecular mass and putative sequence similarities with plant proteins. The effects of SteLL (12.5 μg/mL) on viability, cytosolic Ca2+ concentration ([Ca2+]cyt), cytosolic and mitochondrial levels of reactive oxygen species (ROS), and mitochondrial transmembrane potential (ΔΨm) of mice splenocytes were determined. In addition, the culture supernatants were collected for quantification of interleukins (IL), tumor necrosis factor (TNF), interferon-gamma (IFN-γ) and nitric oxide (NO). SteLL showed a native molecular mass of 12.4 kDa and tandem mass spectrometry (MS/MS) ions search revealed similarities with adenosine triphosphate (ATP) synthase and F1-ATPase from plants (4% and 6% coverage, respectively). SteLL was not toxic to splenocytes, did not alter the [Ca2+]cyt and ROS levels, and slightly reduced ΔΨm. The presence of SteLL stimulated the cells to release pro-inflammatory cytokines (IL-17A, TNF-α, IFN-γ and IL-2) and also of IL-4, an anti-inflammatory cytokine that can prevent exacerbated inflammation. SteLL induced decrease in the secretion of NO. In conclusion, SteLL has biotechnological potential as an immunomodulator agent for use in studies employing cultures of immune cells. In addition, the anti-infectious and antitumor properties of the leaves may involve the immunomodulation property of SteLL.
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Abbreviations
- ΔΨm:
-
Mitochondrial transmembrane potential
- [Ca2+]cyt :
-
Cytosolic Ca2+ concentration
- AnnV:
-
Annexin V
- ATP:
-
Adenosine triphosphate
- CBA:
-
Cytometric bead array
- CXCL:
-
Chemokine (C-X-C motif) ligand
- ESI-QUAD-TOF:
-
Electrospray ionization quadrupole time-of-flight
- FITC:
-
Fluorescein isothiocyanate
- HA:
-
Hemagglutinating activity
- HSP70:
-
70-kDa heat shock proteins
- IC50 :
-
Concentrations that reduced cell viability to 50%)
- IFN-γ:
-
Interferon-gamma
- IL:
-
Interleukin
- JAK/STAT:
-
Janus kinases/signal transducer and activator of transcription proteins
- MIP-1α:
-
Macrophage inflammatory protein 1α
- MS/MS:
-
Tandem mass spectrometry
- NO:
-
Nitric oxide (NO)
- PBS:
-
Phosphate buffered saline
- PI:
-
Propidium iodide
- ROS:
-
Reactive oxygen species
- SDS-PAGE:
-
Polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulphate
- SteLL:
-
Schinus terebinthifolia leaf lectin
- Th:
-
T helper
- TNF:
-
Tumor necrosis factor
- UFPE:
-
Universidade Federal de Pernambuco
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Acknowledgements
The authors express their gratitude to the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq; 408789/2016-6) for research grants and fellowships (RBZ, PMGP and THN) as well as to the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Finance Code 001) and Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco (FACEPE; APQ-0108-2.08/14; APQ-0661-2.08/15) for financial support. The authors thank the Núcleo de Plataformas Tecnológicas of the Instituto Aggeu Magalhães, Fundação Oswaldo Cruz (FIOCRUZ Pernambuco). We thank Ana Lucia Oliveira Carvalho and Augusto Vieira for technical assistance with mass spectrometry analysis.
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dos Santos, A.J.C.A., da Silva Barros, B.R., de Souza Aguiar, L.M. et al. Schinus terebinthifolia leaf lectin (SteLL) is an immunomodulatory agent by altering cytokine release by mice splenocytes. 3 Biotech 10, 144 (2020). https://doi.org/10.1007/s13205-020-2137-2
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DOI: https://doi.org/10.1007/s13205-020-2137-2