Kisspeptin · research summary

Obesity, Oxidative Stress, and Inflammation in Precocious Puberty: Do All Roads Lead to the Hypothalamus?

International journal of molecular sciences · 2026. Summary drawn from the study's full text. Each statement is followed by the exact sentence it comes from. This is a research summary, not medical advice.

Study type

Narrative review
“This narrative review summarizes current evidence on the hypothalamic mechanisms controlling pubertal timing, with particular emphasis on the KNDy neuronal network and its interactions with metabolic and environmental signals.”

Subjects

Children with obesity and central precocious puberty (CPP), as well as animal and cellular models
“This narrative review summarizes current evidence on the hypothalamic mechanisms controlling pubertal timing, with particular emphasis on the KNDy neuronal network and its interactions with metabolic and environmental signals.”

Sample size

150 references
“The final synthesis draws on 150 references spanning 1986 to 2026, approximately 87% of which were published from 2010 onward.”

Duration

1986 to 2026
“The final synthesis draws on 150 references spanning 1986 to 2026, approximately 87% of which were published from 2010 onward.”

Reported findings

Childhood obesity is associated with earlier pubertal timing, particularly in girls, but direct evidence that obesity induces true central precocious puberty is limited.
“Childhood obesity is consistently associated with earlier pubertal timing, particularly in girls, whereas its relationship with true central precocious puberty (CPP), defined by premature activation of the hypothalamic–pituitary–gonadal (HPG) axis, is less clearly established.”
Mechanistic understanding of how obesity influences pubertal timing derives predominantly from experimental models involving metabolic, inflammatory, and epigenetic pathways.
“Mechanistic understanding of how these peripheral signals may influence pubertal timing derives predominantly from experimental models.”
Direct evidence in children with CPP regarding hypothalamic oxidative stress, glial activation, or microbiome-mediated activation remains limited or absent.
“Direct evidence in children with CPP—of hypothalamic oxidative stress, glial activation, Nrf2 dysfunction, SIRT1 remodeling, or microbiome-mediated activation—remains limited or absent.”

Limitations stated by the authors

Predominance of animal and cellular evidence over direct human data, and lack of formal risk-of-bias assessment or quantitative meta-analysis.
“Because this is a narrative synthesis, no protocol was registered and no formal risk-of-bias assessment or quantitative meta-analysis was performed; the resulting limitations, including the predominance of animal and cellular evidence over direct human data, are discussed in Section 8.”

Source: PubMed 42794587 · DOI 10.3390/ijms27188159 · all study summaries

Subjects

Children with obesity and central precocious puberty (CPP), as well as animal and cellular models

“This narrative review summarizes current evidence on the hypothalamic mechanisms controlling pubertal timing, with particular emphasis on the KNDy neuronal network and its interactions with metabolic and environmental signals.”

Reported findings

Childhood obesity is associated with earlier pubertal timing, particularly in girls, but direct evidence that obesity induces true central precocious puberty is limited.

“Childhood obesity is consistently associated with earlier pubertal timing, particularly in girls, whereas its relationship with true central precocious puberty (CPP), defined by premature activation of the hypothalamic–pituitary–gonadal (HPG) axis, is less clearly established.”

Mechanistic understanding of how obesity influences pubertal timing derives predominantly from experimental models involving metabolic, inflammatory, and epigenetic pathways.

“Mechanistic understanding of how these peripheral signals may influence pubertal timing derives predominantly from experimental models.”

Direct evidence in children with CPP regarding hypothalamic oxidative stress, glial activation, or microbiome-mediated activation remains limited or absent.

“Direct evidence in children with CPP—of hypothalamic oxidative stress, glial activation, Nrf2 dysfunction, SIRT1 remodeling, or microbiome-mediated activation—remains limited or absent.”

Limitations stated by the authors

Predominance of animal and cellular evidence over direct human data, and lack of formal risk-of-bias assessment or quantitative meta-analysis.

“Because this is a narrative synthesis, no protocol was registered and no formal risk-of-bias assessment or quantitative meta-analysis was performed; the resulting limitations, including the predominance of animal and cellular evidence over direct human data, are discussed in Section 8.”