Behavioral and immune changes in v-Ha-ras transgenic mice

Area of Science:

• Oncology
• Immunology
• Neuroscience

Background:

• Transgenic mice (Oncomice) expressing an activated v-Ha-ras oncogene develop mammary tumors.
• The study investigated potential links between oncogene expression, behavioral changes, and immune system alterations.

Purpose of the Study:

• To assess if v-Ha-ras oncogene expression impacts mouse behavior.
• To explore associations between behavioral changes and immune system markers, specifically Interleukin-2 (IL-2) and Interleukin-1 alpha (IL-1α).

Main Methods:

• Behavioral activity was measured using an open field test, recording line crossings and rears.
• Immune markers were quantified in spleen and thymus cell supernatants and serum.
• Mice were subjected to dietary changes (Lieber-DeCarli diet) and pharmacological treatment (cocaine).

Main Results:

• Oncomice exhibited significantly lower activity levels in the open field test compared to control FVB mice.
• Lieber-DeCarli diet reduced activity in both Oncomice and FVB mice.
• Cocaine treatment increased line crossings in both mouse strains.
• Oncomice showed elevated levels of IL-2 in spleen and thymus supernatants and higher IL-1α in serum.
• A negative correlation was observed between IL-1α levels and open field activity.

Conclusions:

• Increased IL-1α levels are directly associated with reduced open field activity in Oncomice.
• Elevated IL-1α may play a crucial role in mediating oncogene-induced immune and behavioral modifications.
• IL-1α could be a necessary factor facilitating the transforming activity of oncogenes.