Toward an optimal contraception dosing strategy

Area of Science:

• Reproductive Endocrinology
• Mathematical Biology
• Pharmacology

Background:

• Anovulation, the absence of ovulation, is a target for hormonal contraception.
• Current methods using high-dose exogenous estrogen and progesterone carry risks like thrombosis and myocardial infarction.
• Optimizing hormone therapy is crucial for effective and safe ovulation suppression.

Purpose of the Study:

• To determine the minimum total dose and optimal administration timing of exogenous estrogen and progesterone to induce anovulation.
• To utilize optimal control theory on a modified menstrual cycle model for dose optimization.
• To provide insights for clinicians on formulating and scheduling ovulation-suppressing therapies.

Main Methods:

• Development and application of a modified mathematical model of the menstrual cycle.
• Incorporation of optimal control theory to minimize exogenous hormone dosage.
• Simulation of pituitary (LH, FSH) and ovarian (E2, P4, Inh) hormone dynamics under various therapeutic scenarios.

Main Results:

• The mathematical model accurately predicted hormone levels during normal and altered menstrual cycles.
• Estrogen monotherapy demonstrated a potential dose reduction of 92%.
• Progesterone monotherapy showed a 43% dose reduction, most effective in the mid-follicular phase.
• Combined estrogen and progesterone therapy further reduced required hormone doses.

Conclusions:

• Optimal control theory can significantly minimize exogenous hormone doses for anovulation induction.
• Specific timing, particularly mid-follicular estrogen administration, enhances therapeutic efficacy.
• Findings suggest potential for developing safer and more effective hormonal contraceptive formulations and regimens.