The invention provides methods and compositions for stimulating or promoting bone regeneration or repairing bone fracture or for stimulating or increasing differentiation or activation of osteoblasts by administering to a subject a therapeutically effective amount of an adenosine receptor agonist, or an analog, derivative or combination thereof, an adenosine receptor antagonist, or an analog, derivative or combination thereof, or adenosine or a compound that upregulates, increases the amount of or increases the biological activity of adenosine. The invention also extends to pharmaceutical compositions such as those comprising an agent that modulates an adenosine receptor such as an adenosine A2A agonist or A1 antagonist.
