Pancreatic Islet Cell Proliferation via Cyclic Glucose Pathway Activation

The patent applies periodic action by alternately culturing pancreatic islet cells in high-glucose medium (25 mM) and low-glucose medium (11.5 mM) in a cyclic manner. This periodic glucose concentration switching maintains sustained proliferation activity of Mycl-transferred cells over multiple subcultures, preventing the decline that occurs with continuous high-glucose or static conditions. The alternating glucose environments create rhythmic stimulation that preserves cellular proliferative capacity throughout extended culture periods.

The patent implements parameter changes by dynamically adjusting glucose concentration as a key cultural parameter. Instead of maintaining a constant glucose level, the method switches between high (25 mM) and low (11.5 mM) glucose concentrations at specific time intervals. This parameter modulation optimizes both the promotion of cell growth and the maintenance of proliferation activity over time, resolving the contradiction between immediate productivity and long-term duration.

The patent uses periodic action to alternate between high-glucose (25 mM) and low-glucose (11.5 mM) cultural conditions. During high-glucose phases, proliferation rate is enhanced, while low-glucose phases allow cellular recovery and maintenance of function quality. This rhythmic switching prevents the detrimental effects of continuous high-glucose exposure while preserving overall proliferative output, thus balancing productivity with reliability.

The patent applies preliminary action by preparing cells in alternating glucose conditions before final transplantation or experimentation. The periodic pre-culturing in switched glucose environments pre-adapts cells to maintain both proliferative capacity and functional quality, ensuring that cells are in optimal condition prior to their intended use. This preliminary periodic conditioning prevents quality deterioration that would occur with continuous high-glucose culture.

The patent implements periodic action during repeated subcultures by alternating glucose concentrations at each passage. This periodic switching maintains proliferative activity throughout multiple subculture cycles, enabling both quantity increase and productivity preservation. The rhythmic glucose variation prevents the loss of proliferative capacity that typically occurs with conventional repeated subculturing, allowing sustained amplification of cell numbers with maintained activity.

The patent ensures continuity of useful action by maintaining proliferative activity throughout the entire subculture process through periodic glucose switching. Rather than allowing activity to decline between passages, the alternating high-low glucose regimen continuously sustains proliferative capacity across all subculture steps. This continuous maintenance of productivity enables uninterrupted cell amplification without the usual degradation of proliferative potential.