There are too many unknowns here to give complete and conclusive answers to these questions. Dopaminergic signaling in immunology is an [active research topic](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9832385/) and many knowledge gaps remain.
Also, looking at your post history asking for studies and concrete data, you may want to be asking over at r/askscience instead. It would probably also help if you organized your questions and find a common thread instead of posting lots of separate questions.
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