An Ixodes scapularis cell line with a predominantly neuron-like phenotype

Area of Science:

• Tick cell line research
• Neurobiology
• Vector-borne disease research

Background:

• The Ixodes scapularis embryo-derived cell line (ISE6) is crucial for studying tick- and non-tick-vectored pathogens.
• Limited information exists regarding the tissue origin and biological background of ISE6 cells.

Purpose of the Study:

• To investigate the tissue origin and biological characteristics of the ISE6 cell line.
• To compare protein expression profiles of ISE6 cells with another Ixodes scapularis-derived cell line (IDE12) and tick synganglia.
• To assess the in vivo response of ISE6 cells to the tick hemocoel environment.

Main Methods:

• Comparative proteomic analysis of ISE6 cells, IDE12 cells, and dissected tick synganglia.
• Identification of neuronal and immune response-associated proteins.
• In vivo implantation of ISE6 cells into unfed larval, unfed nymphal, and molting nymphal ticks.

Main Results:

• Presence of the neuronal marker type 3 β-tubulin and other shared neuronal proteins in ISE6, IDE12, and synganglia.
• ISE6 cells expressed several neuronal proteins at higher levels than IDE12 cells.
• In vivo implantation into larval and molting nymphal ticks induced neuron-like morphological changes in ISE6 cells.

Conclusions:

• ISE6 cells possess neuronal characteristics and share similarities with tick synganglia.
• The hemocoel environment influences ISE6 cell morphology, suggesting a potential for neuronal differentiation.
• These findings support the utility of ISE6 cells in neurobiology and tick-borne disease research.