Air carrier flight crew reported loss of pressurization in descent. Flight crew continued to destination and landed uneventfully.

Narrative

After leveling off from an ATC instructed descent to cross ZZZZZ at FL280; we received a cabin altitude warning horn and corresponding warning light while there seemed to be no noticeable physiological warning signs by either of us. While silencing the horn I saw the cabin altitude approaching 10;000 ft and slowly climbing. As I had just been handed off to the next center and hadn't checked in; yet; I quickly checked in and called for an immediate descent to a lower altitude for a loss of cabin pressure while [requesting priority handling]. The FO hit LVL CHG and began a descent. Immediately; and as the thrust levers moved to idle; the cabin pressure stabilized near 10;000 ft and began to slowly decrease toward 8500-9;000 ft. We continued to 10;000 ft to ensure the cabin altitude would not climb again. Once there; I briefed the purser and gave a brief explanation to the pax over the PA. We had plenty of fuel and the weather was decent at ZZZ. We were on the arrival already; so with the QRC for cabin altitude warning reviewed again down to the deferred descent and landing checklists; we continued on to ZZZ uneventfully where we debriefed the mechanics who were waiting for us on arrival.The aircraft was on MEL XXXXX High Stage Valves. Engine anti-icing was off during the pressure loss as we were not in icing conditions.