Juvenile hormone (JH), ecdysteroids, and insulin/IGF-like signaling (IIS) are often described as separable endocrine systems controlling insect development, metabolism, and reproduction. Evidence from selected insects instead reveals regulatory connections among these systems, but it does not support a single invariant endocrine cascade. This article develops an original molecular-physiological synthesis in which JH, ecdysteroid, and IIS components form a proposed conditionally reconfigurable regulatory network. Directly supported relationships include endocrine control of insulin-like peptide transcription, nutrient-dependent differentiation of IIS outputs, IIS-associated modulation of JH reproductive physiology, JH-effector repression of ecdysteroid biosynthesis, and convergence of insulin and ecdysteroid signaling on reproductive effectors. The same literature also identifies critical boundaries: regulatory direction changes with target gene and developmental state, endocrine sources can remain unresolved, and IIS-dependent oogenesis can occur without detectable alteration of JH or ecdysteroid signaling in at least one model. We therefore distinguish coupling, hierarchy, convergence, reciprocal regulation, and conditional independence as different network states rather than treating endocrine integration as obligatory. Developmental and reproductive decisions are interpreted as context-dependent outputs of these changing relationships across tissues, stages, nutritional states, sexes, and taxa. The resulting synthesis generates experimentally distinguishable predictions while retaining explicit limits on cross-species and organism-level generalization.
