Some have understood the angel mentioned in each letter to the seven churches of chapters 2-3 to refer to the pastor of the respective congregation. In order to come to this view of the seven angels, the term angeloi (ἄγγελοι) needs to be understand in the generic sense of a messenger, so the human messengers of the churches.
It is unlikely that this is what John meant. First, it is doubtful that John used a symbol of another symbol, with the seven stars representing seven angels, who are the pastors of the churches. Such a usage would be unique to the rest of the usages of angeloi (ἄγγελοι) in the remainder of the book (1:1; 5:2 et al).
But is it likely that angels exercise authority and responsibility toward churches? The answer is yes. There is precedent for angels being involved in human activity in the Old and New Testaments (cf Daniel, 1 Corinthians 11, Heb 1:14 et al).
Without further explanation, one would expect angels to refer to spirit beings, as they are throughout the book. Angels from God having involvement and responsibility within the assemblies of Asia Minor makes the most sense.