A lot of this depends on your table image and what happened previously. Did you lose your stack with a strong hand to a suckout? Slowly over a period of medium to strong hands? Aggressively w/ weak hands?

If you're only shown down good cards so far, I think it's okay to raise 3xBB even down to A8. If weaker cards were shown, I'd probably just pass except for AK or AQ. It's too early to get in a confrontation with a reraise from one of the blinds.