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首页> 外文期刊>The European Journal of Neuroscience >Size variation and cell proliferation in chemosensory brain areas of a lizard (Podarcis hispanica): effects of sex and season.
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Size variation and cell proliferation in chemosensory brain areas of a lizard (Podarcis hispanica): effects of sex and season.

机译：蜥蜴（Podarcis hispanica）的化学感应大脑区域的大小变化和细胞增殖：性别和季节的影响。

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摘要

Many lizards rely on chemoreception for crucial aspects of their biology, including exploration, prey and predator detection, and intraspecific communication. Here we investigate sex and seasonal variation in size and proliferative activity in chemosensory areas of the lizard brain. We captured adult Iberian wall lizards (Podarcis hispanica) of either sex in the breeding (April) and non-breeding (November) season, injected them with 5-bromo-2'-deoxyuridine (BrdU) and killed them 3 weeks later. We removed the brains, measured the length of the olfactory bulbs, and counted BrdU-labelled cells in the main and accessory olfactory bulbs (MOB, AOB), lateral cortex (LC) and nucleus sphericus (NS). Our results show that, relative to body size, males have larger MOBs and AOBs than females; however, relative to brain size, males have larger AOBs, but not larger MOBs than females. Additionally, males produce more new cells than females in the olfactory bulbs, LC and NS. We failed to detect significant seasonal changes or sex x season interaction in size or proliferative activity in these areas. Sex differences in the addition of newly generated cells--mainly neurons--may be partly responsible for the size differences in chemosensory brain areas. The presence of sexual dimorphism in AOB is expected given the available behavioural evidence, which suggests that males of P. hispanica are more responsive than females to socially relevant chemical stimuli. This is the first demonstration of sexual dimorphism in size and proliferative activity in chemosensory areas of a non-mammalian species.
机译：许多蜥蜴在其生物学的关键方面都依赖化学感受，包括探索，捕食和掠食者检测以及种内交流。在这里，我们研究蜥蜴脑化学感应区域的大小和增殖活性的性别和季节性变化。我们在繁殖期（4月）和非繁殖期（11月）捕获了两性的成年伊比利亚壁蜥（Podarcis hispanica），并向它们注射了5-溴-2'-脱氧尿苷（BrdU），并在3周后将其杀死。我们摘除大脑，测量嗅球的长度，并计数主要和副嗅球（MOB，AOB），侧皮层（LC）和球状核（NS）中BrdU标记的细胞。我们的结果表明，相对于体型，雄性的MOB和AOB大于雌性;但是，相对于大脑的大小，男性的AOB较大，但MOB却不比女性大。此外，在嗅球，LC和NS中，雄性比雌性产生更多的新细胞。在这些区域，我们没有发现大小或增殖活动的显着季节变化或性别x季节相互作用。新增细胞（主要是神经元）的性别差异可能部分归因于化学感应性大脑区域的大小差异。鉴于可获得的行为证据，预计AOB中会存在性二态性，这表明西班牙裔体育男性比女性对社会相关的化学刺激更具反应性。这是在非哺乳动物物种的化学感应区域中大小和增殖活性发生性二态性的首次证明。

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