旨在探究酪氨酸相关蛋白酶1(tyrosinase related protein 1,TYRP1)对香猪原代表皮黑素细胞黑色素生成的影响。本研究选用具有“两头乌”毛色特征的3月龄健康香猪3头,每头猪采取头部黑色皮肤组织和背部白色皮肤组织。通过HE染色观察不同...旨在探究酪氨酸相关蛋白酶1(tyrosinase related protein 1,TYRP1)对香猪原代表皮黑素细胞黑色素生成的影响。本研究选用具有“两头乌”毛色特征的3月龄健康香猪3头,每头猪采取头部黑色皮肤组织和背部白色皮肤组织。通过HE染色观察不同颜色香猪皮肤的毛囊结构及黑素细胞的分布特征;体外培养香猪原代表皮黑素细胞并通过多巴(L-Dopa)染色、实时荧光定量PCR和Western Blot方法进行鉴定;根据TYRP1基因序列构建5条siRNA,采用实时荧光定量PCR筛选出干扰效率最高的siRNA进行转染。成功干扰黑素细胞内TYRP1的表达后,分别通过实时荧光定量PCR、Western Blot、黑色素含量检测方法对黑素细胞内TYR、TYRP1及TYRP2的mRNA与蛋白相对表达量、细胞内总黑色素含量进行检测。结果显示,在香猪黑色和白色皮肤中都观察到完整的毛囊结构,黑素细胞主要分布在香猪黑色被毛皮肤中的毛囊外根鞘部位以及表皮。在MelM培养基作用下,黑素细胞生长旺盛,细胞形态、生长曲线、多巴染色、实时荧光定量PCR及Western Blot结果均表明培养的黑素细胞维持正常的生物学特性。敲降TYRP1后下调香猪表皮黑素细胞中黑色素生成相关基因TYR、TYRP1和TYRP2的mRNA和蛋白的表达,同时对黑色素的形成具有抑制作用。TYRP1基因能够影响香猪表皮黑素细胞黑色素的生成,研究结果可为探索TYRP1基因对香猪黑色素沉积的分子机制提供试验参考和基础数据。展开更多
The most prominent colors observed in insects are black or brown, whose production is attributed to the melanin pathway. At present, though, the contribution of this pathway to overall body pigmentation throughout ont...The most prominent colors observed in insects are black or brown, whose production is attributed to the melanin pathway. At present, though, the contribution of this pathway to overall body pigmentation throughout ontogenesis is still lacking. To address this question we examined the roles of 2 key melanin genes （TH and DDC）, in embryonic and postembryonic development of the American cockroach, Periplaneta americana. Our results show that the melanin pathway does not contribute to the light brown coloration observed in the first nymphs. However, the dark brown coloration in mid nymphs and adults is produced solely from the melanin pathway. In addition, the DDC RNAi results reveal that it is dopamine melanin, not DOPA melanin, acts as the main contributor in this process. Overall, present study provides a new insight into insect pigmentation suggesting that genetic mechanisms of coloration can change during ontogenesis. Future studies of additional basal insect lineages will be required to assess in more details the generality of this phenomenon.展开更多
文摘旨在探究酪氨酸相关蛋白酶1(tyrosinase related protein 1,TYRP1)对香猪原代表皮黑素细胞黑色素生成的影响。本研究选用具有“两头乌”毛色特征的3月龄健康香猪3头,每头猪采取头部黑色皮肤组织和背部白色皮肤组织。通过HE染色观察不同颜色香猪皮肤的毛囊结构及黑素细胞的分布特征;体外培养香猪原代表皮黑素细胞并通过多巴(L-Dopa)染色、实时荧光定量PCR和Western Blot方法进行鉴定;根据TYRP1基因序列构建5条siRNA,采用实时荧光定量PCR筛选出干扰效率最高的siRNA进行转染。成功干扰黑素细胞内TYRP1的表达后,分别通过实时荧光定量PCR、Western Blot、黑色素含量检测方法对黑素细胞内TYR、TYRP1及TYRP2的mRNA与蛋白相对表达量、细胞内总黑色素含量进行检测。结果显示,在香猪黑色和白色皮肤中都观察到完整的毛囊结构,黑素细胞主要分布在香猪黑色被毛皮肤中的毛囊外根鞘部位以及表皮。在MelM培养基作用下,黑素细胞生长旺盛,细胞形态、生长曲线、多巴染色、实时荧光定量PCR及Western Blot结果均表明培养的黑素细胞维持正常的生物学特性。敲降TYRP1后下调香猪表皮黑素细胞中黑色素生成相关基因TYR、TYRP1和TYRP2的mRNA和蛋白的表达,同时对黑色素的形成具有抑制作用。TYRP1基因能够影响香猪表皮黑素细胞黑色素的生成,研究结果可为探索TYRP1基因对香猪黑色素沉积的分子机制提供试验参考和基础数据。
文摘The most prominent colors observed in insects are black or brown, whose production is attributed to the melanin pathway. At present, though, the contribution of this pathway to overall body pigmentation throughout ontogenesis is still lacking. To address this question we examined the roles of 2 key melanin genes （TH and DDC）, in embryonic and postembryonic development of the American cockroach, Periplaneta americana. Our results show that the melanin pathway does not contribute to the light brown coloration observed in the first nymphs. However, the dark brown coloration in mid nymphs and adults is produced solely from the melanin pathway. In addition, the DDC RNAi results reveal that it is dopamine melanin, not DOPA melanin, acts as the main contributor in this process. Overall, present study provides a new insight into insect pigmentation suggesting that genetic mechanisms of coloration can change during ontogenesis. Future studies of additional basal insect lineages will be required to assess in more details the generality of this phenomenon.
