X-posted on reddit AskScience here.
I know that macrophages engulf foreign bodies and transport them to various waste excretion pathways (sorry if the terminology is wrong), and if the foreign bodies are cellular in nature, they get trapped in phagolysosomes and get digested by enzymes.
Does the macrophage get any "nutrition" by destroying the cells, the same way that a person would if those same cells were to pass through their digestive system? Is there any chemical energy produced by the catalysis that the macrophage then uses, e.g. pyruvate for its mitochondria? Or scavenged cellular components that it can use to build its own cytoskeleton?