Common overpair situation

[Ghazban]

With no reads, what do you do here?

Party Poker No-Limit Hold'em, $4 BB (6 max, 6 handed) converter

UTG ($207)
MP ($2638.99)
Hero ($400)
Button ($368.68)
SB ($387.80)
BB ($328.80)

Preflop: Hero is CO with A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $2.
<font color="#666666">1 fold</font>, MP calls $4, <font color="#CC3333">Hero raises to $16</font>, Button calls $16, <font color="#666666">2 folds</font>, MP calls $12.

Flop: ($54) T[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
MP checks, Hero bets $50, button raises to $150, MP folds, Hero?