Histocytological specificities of adrenal cortex in the New World Monkeys, <i>Aotus lemurinus</i> and <i>Saimiri boliviensis</i>

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  • TACHIBANA Toru
    Laboratory of Basic Veterinary Science, The United Graduate School of Veterinary Science, 1677–1 Yoshida, Yamaguchi 753–8515, Japan
  • KUSAKABE Ken Takeshi
    Laboratory of Basic Veterinary Science, The United Graduate School of Veterinary Science, 1677–1 Yoshida, Yamaguchi 753–8515, Japan
  • OSAKI Sayuri
    Laboratory of Basic Veterinary Science, The United Graduate School of Veterinary Science, 1677–1 Yoshida, Yamaguchi 753–8515, Japan
  • KURAISHI Takeshi
    Amami Laboratory of Injurious Animals, Institute of Medical Science, The University of Tokyo, 802 Teyasu, Setouchi-cho, Ohshima-gun, Kagoshima 894–1531, Japan
  • HATTORI Shosaku
    Amami Laboratory of Injurious Animals, Institute of Medical Science, The University of Tokyo, 802 Teyasu, Setouchi-cho, Ohshima-gun, Kagoshima 894–1531, Japan
  • YOSHIZAWA Midori
    Graduate School of Agricultural Science, Utsunomiya University, 350 Mine-machi, Utsunomiya, Tochigi 321–8505, Japan
  • KAI Chieko
    Amami Laboratory of Injurious Animals, Institute of Medical Science, The University of Tokyo, 802 Teyasu, Setouchi-cho, Ohshima-gun, Kagoshima 894–1531, Japan
  • KISO Yasuo
    Laboratory of Basic Veterinary Science, The United Graduate School of Veterinary Science, 1677–1 Yoshida, Yamaguchi 753–8515, Japan

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  • Anatomy : Histocytological specificities of adrenal cortex in the New World Monkeys, Aotus lemurinus and Saimiri boliviensis

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The New World monkey Aotus spp. (night monkeys) are expected for use of valuable experimental animal with the close species of Saimiri spp. (squirrel monkeys). Saimiri is known to show spontaneous hypercortisolemia, although few reports in Aotus. We compared basic states of blood steroid hormones and histological structure of the adrenal glands in two monkeys. Serum cortisol and ACTH levels were statistically lower in Aotus than Saimiri. Conversely, Aotus adrenocortical area showed significant enlargement, especially at the zona fasciculata. Electron microscopic observation at Aotus fasciculata cells revealed notable accumulation of large lipid droplets and irregular shapes of the mitochondrial cristae. These results suggest potential differences in cellular activities for steroidogenesis between Aotus and Saimiri and experimental usefulness in adrenocortical physiology and pathological models.

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