I don't know what you mean exactly, but if you want it to appear to "glow" from the inside, you need to set the material to "Translucent" blending. You still need the light source, though.
Also, messed around creating a see-through green slime, but am unimpressed by the lighting when you can see through it. The texture needs to be more or less flat, or it looks weirdly "dirty" on the surface, whilst remaining clear in the inside. Perhaps if I did a particle system with bubbles inside it...?