In nursing mice, brain cells link bone, fat, energy use and pain sensitivity

In mice, prolactin-responsive nerve cells in the hypothalamus altered food demand and pain sensitivity while influencing calcium release from bone.

Editorial illustration — not from the study.

Researchers identified prolactin receptor-bearing nerve cells in the hypothalamus that helped regulate metabolism and pain sensitivity in nursing mice. The cells responded to prolactin, a hormone involved in lactation, and affected signals linked to food demand and bone mineral mobilization.

The work also points to different hypothalamic regions contributing to these effects. Reducing either the prolactin receptor or neuropeptide Y in one region lowered food demand and pain sensitivity, while signaling in another region increased sympathetic nerve activity that mobilized calcium in bone.

What the brain cells did

The researchers studied prolactin receptor-positive neurons in the hypothalamus of lactating mice. Prolactin increased production of tyrosine hydroxylase in dopamine-producing neurons in the arcuate nucleus, a hypothalamic region. Neuropeptide Y levels also rose, and the researchers linked this change to altered energy demand and pain sensitivity during lactation.

Reducing either the prolactin receptor or neuropeptide Y in the arcuate nucleus significantly lowered food demand and pain sensitivity. Prolactin also increased tyrosine hydroxylase in the hypothalamic paraventricular nucleus, which increased sympathetic nerve signaling and mobilized calcium in bone. The researchers identified CCN3, a hormone associated with bone formation and produced in the brain, as a downstream signal of prolactin receptor activity in these dopamine-producing neurons.

Why the pathway matters

Lactation is associated with changes in energy use and bone metabolism, but the brain mechanisms involved are not fully understood. These mouse experiments identify prolactin-responsive hypothalamic neurons as a link between lactation hormones and changes involving food demand, fat and bone metabolism, and pain sensitivity. The results help define a possible brain pathway for maternal metabolic regulation, while their relevance to human lactation remains unknown.

Evidence and caveats

This was an article reporting experiments in lactating mice, including changes to prolactin receptor and neuropeptide Y signaling in hypothalamic neurons. The findings identify a brain pathway that regulates several aspects of lactation physiology in mice, but the abstract does not establish that the same pathway operates in humans. It also does not provide sample sizes or details of the pain and metabolism measurements.

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