How does Buddhist pratītyasamutpāda respond to the objection of infinite regress?

In many Buddhist explanations, pratītyasamutpāda (dependent origination) states that all phenomena arise dependent on causes and conditions. However, a common philosophical objection is that if every phenomenon depends on a prior cause, this seems to imply an infinite regress of causes, with no ultimate grounding. If every conditioned phenomenon requires another conditioned phenomenon to give rise to it, how does Buddhism avoid either: an infinite regress of causes, or the need for some first, unconditioned cause (which most schools reject)?