Levels of serum leptin are not a useful biomarker of the severity of spinal muscular atrophy (SMA) type 2 or type 3 in children and adolescents, a cross-sectional study suggests.

The results did not show any statistically significant correlation between motor function, as indicated by the Hammersmith Functional Motor Scale–Expanded scores of the patients, and the levels of leptin in their serum. 

The findings were published in the journal Archives de Pédiatrie.


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SMA is an autosomal recessive neurodegenerative disease caused by mutations in the survival motor neuron 1 (SMN1) gene, which is the principal gene coding for the SMN protein. SMN deficiency leads to neurodegeneration and muscular atrophy. 

Read more about the different types of SMA

In humans, there is a second gene called SMN2 from which some functional SMN protein can also be made. The copy number of the SMN2 gene correlates with disease severity, with patients with more copies having a milder disease.

Leptin is a hormone derived from adipocytes, which induces a decrease in food intake and increases energy expenditure. 

Research has shown that patients with SMA with lower levels of motor function have low levels of serum leptin. Moreover, low levels of serum leptin have been found in patients with SMA who were underweight.

To analyze the possible link between serum leptin levels and SMA, a team of researchers from Serbia led by Vera Zdravkovic, MD, PhD, conducted a study of 37 patients with SMA type 2 or 3. Participants were 2 to 19 years of age.

The team assessed the patients’ anthropometric measurements, pubertal status, motor function, and serum leptin levels. The results did show a strong positive correlation between serum leptin levels and body mass index z-scores.

Reference

Djordjevic S, Milic-Rasic V, Brankovic V, et al. Serum leptin levels in children and adolescents with spinal muscular atrophy types 2 and 3. Arch Pediatr. 2022;12:S0929-693X(22)00185-3. doi:10.1016/j.arcped.2022.08.015