Helicobacter pylori Induced Anxiety and Anorexia
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PGP9.5 was used as a Hypothalamic Neuronal Marker in this study-Hajime Suzuki, Koji Ataka, Akihiro Asakawa, Kai-Chun Cheng, Miharu Ushikai, Haruki Iwai, Takakazu Yagi, Takeshi Arai, Kinnosuke Yahiro, Katsuhiro Yamamoto, Yoshito Yokoyama, Masayasu Kojima, Toshihiko Yada, Toshiya Hirayama, Norifumi Nakamura & Akio Inui (2019).
Helicobacter pylori Vacuolating Cytotoxin A Causes Anorexia and Anxiety via Hypothalamic Urocortin 1 in Mice. Scientific Reports volume 9, Article number: 6011.
Images: Ucn1- and DAPI-positive cells (yellow arrow heads), or Ucn1- and PGP9.5-positive cells (white arrow heads) in the PVN cells.
This is the first study demonstrating the anorexigenic and anxiogenic effects of VacA. The authors propose the following. VacA secreted by Hp in the stomach travels via the peripheral circulation and passes through the BBB. VacA binds to LRP1 and activates the intracellular PLC-PKC pathway, resulting in the activation of Ucn1-positive neurons, such as in the PVN of the hypothalamus. Secreted Ucn1 induces the inhibition of food intake through CRF2 receptors and anxiety through CRF1 receptors (Fig. 6). The central Ucn1-CRF receptor axis activated by VacA might be a new important pathway that contributes to the anorexigenic and anxiogenic effects of Hp infection and could be a therapeutic target for Hp-induced alterations.
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