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Updated: Aug 11, 2026
09:14
Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
Published on: June 13, 2014
A C-type lectin from the tunicate, Styela plicata, that modulates cellular activity
S V Nair1, M Burandt, A Hutchinson
1Department of Biological Sciences, Macquarie University, 2109, North Ryde, NSW, Australia. snair@gwu.edu
Summary
Researchers identified a tunicate protein that mimics interleukin 1 (IL-1) functions. This protein stimulates cell proliferation and immune responses in both tunicates and mammals, suggesting conserved immune signaling pathways.
Area of Science:
- Immunology
- Marine Biology
- Biochemistry
Background:
- Tunicates, invertebrate chordates, possess proteins with properties similar to mammalian inflammatory cytokine interleukin 1 (IL-1).
- Understanding these homologous proteins can provide insights into conserved immune mechanisms across species.
Purpose of the Study:
- To characterize a specific protein from Styela plicata with potential IL-1-like activity.
- To investigate the functional effects of this tunicate protein on both tunicate and mammalian immune cells.
- To explore the molecular basis of its interaction with mammalian immune cells.
Main Methods:
- Characterization of a protein isolated from the tunicate Styela plicata.
- Assays to measure cell proliferation in tunicate and mammalian cells.
- Functional assays including phagocytosis activation, interleukin 2 (IL-2) secretion, and IL-2 receptor (IL-2R) expression.
- Partial amino acid sequencing and comparison with known lectin sequences.
Main Results:
- The Styela plicata protein stimulates proliferation in both tunicate and mammalian cells.
- It activates phagocytosis, increases IL-2 secretion by mammalian peripheral blood mononuclear cells, and enhances IL-2 receptor expression on EL-4.IL-2 cells.
- Amino acid sequence analysis reveals similarity to C-type lectins, specifically TC14 family members, suggesting a role in carbohydrate recognition.
Conclusions:
- The characterized Styela plicata protein exhibits IL-1-like immune-modulating functions.
- Its structural similarity to C-type lectins suggests it may interact with glycosylated cell surface receptors on mammalian immunocompetent cells.
- This finding highlights conserved immune pathways and the potential of invertebrate-derived molecules in understanding mammalian immunity.
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