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SPP1 is expressed in corticospinal neurons of the macaque sensorimotor cortex

Noriyuki Higo1, Akira Sato, Tatsuya Yamamoto

  • 1Neuroscience Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Umezono, Tsukuba, Ibaraki 305-8568, Japan. n.higo@aist.go.jp

The Journal of Comparative Neurology
|May 27, 2010
PubMed

Insights

SPP1 gene expression is specific to corticospinal neurons in the rhesus macaque sensorimotor cortex, unlike in marmosets or rats. This suggests SPP1 plays a key role in primate corticospinal system specialization.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Comparative Anatomy

Background:

  • SPP1 gene exhibits higher expression in macaque primary motor cortex.
  • Understanding the cellular distribution of SPP1 is crucial for elucidating its function.

Purpose of the Study:

  • To investigate the cellular distribution of SPP1 across different species.
  • To determine the specific neuronal populations expressing SPP1, particularly in the sensorimotor cortex.
  • To explore the role of SPP1 in corticospinal tract (CST) neurons.

Main Methods:

  • In situ hybridization histochemistry was employed to detect SPP1 mRNA.
  • Retrograde neuroanatomical tracing was used to label CST neurons.
  • Comparative analysis was performed across rhesus macaque, common marmoset, and rat brains.

Main Results:

  • SPP1 mRNA was specifically localized to layer V pyramidal neurons in the rhesus macaque sensorimotor cortex.
  • SPP1 expression was most abundant in primary motor, Brodmann area 5, and supplementary motor areas, correlating with corticospinal neuron distribution.
  • Retrograde tracing confirmed SPP1 expression in corticospinal neurons.
  • SPP1 was also found in the thalamus, brainstem, and spinal cord of macaques, but not in the cerebral cortices of marmosets or rats.

Conclusions:

  • SPP1 is selectively expressed in corticospinal neurons of the rhesus macaque sensorimotor cortex.
  • This selective expression suggests a critical role for SPP1 in the functional or structural specialization of primate corticospinal systems.
  • SPP1's absence in the cerebral cortex of marmosets and rats highlights species-specific adaptations in neural circuitry.

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