Birkbeck (University of London), School of Biological and Chemical Sciences, Malet Street, London WC1E 7HX, United Kingdom.
Peptides. 2011 Mar;32(3):493-9. doi: 10.1016/j.peptides.2010.11.009. Epub 2010 Nov 18.
Spined soldier bugs, Podisus maculiventris, are heteropteran insects that feed voraciously on other insects, particular the soft bodied larval forms of Lepidoptera and Coleoptera. The response of P. maculiventris Malpighian tubules (MTs) to serotonin and known diuretic and antidiuretic peptides has been investigated, and is compared with that of MT from the hematophagous and phytophagous heteropteran bugs Rhodnius prolixus and Acrosternum hilare, respectively. A CRF-related peptide diuretic hormone (DH) from the termite Zootermopsis nevadensis (Zoone-DH) stimulated MT secretion, which was reversed by a member of the CAP(2b) family of peptides from A. hilare (Acrhi-CAP(2b)-2), an antidiuretic effect. Serotonin had no effect on secretion, neither did a representative calcitonin-like DH, kinin, tachykinin-related peptide, and an antidiuretic factor from the mealworm Tenebrio molitor (Tenmo-ADFb) in both P. maculiventris or A. hilare. Serotonin is a DH in R. prolixus, and its lack of effect on MT from P. maculiventris and A. hilare suggests this is an adaptation to hematophagy. On the other hand, the antidiuretic activity of members of the CAP(2b) family in all three bugs is consistent with this being a heteropteran feature rather than a specialism for hematophagy.
刺蝽兵，Podisus maculiventris，是一种异翅目昆虫，它贪婪地捕食其他昆虫，尤其是鳞翅目和鞘翅目幼虫的柔软身体形式。已经研究了 P. maculiventris 马尔皮基氏小管（MT）对血清素和已知利尿肽和抗利尿肽的反应，并与来自吸血和食草异翅目昆虫 Rhodnius prolixus 和 Acrosternum hilare 的 MT 进行了比较。来自白蚁 Zootermopsis nevadensis 的 CRF 相关肽利尿激素（DH）（Zoone-DH）刺激 MT 分泌，而来自 A. hilare 的 CAP(2b)家族成员之一（Acrhi-CAP(2b)-2）则逆转了这种分泌，产生了抗利尿作用。血清素对 P. maculiventris 和 A. hilare 的 MT 分泌均无影响，也没有代表性的降钙素样 DH、激肽、与速激肽相关的肽和来自黄粉虫 Tenebrio molitor 的抗利尿因子（Tenmo-ADFb）。血清素是 R. prolixus 中的 DH，其对 P. maculiventris 和 A. hilare 的 MT 没有影响，这表明这是对吸血的适应。另一方面，CAP(2b)家族成员在所有三种昆虫中的抗利尿活性表明这是一种异翅目特征，而不是专门用于吸血。
