Early passage primate cell immortality is independent of tumorigenicity

Summary Seven continuous primate cell lines were tested in three systems (nude mice, muscle organ culture, and soft agarose) for their ability to express characteristics usually associated with malignant cell lines. Five of the seven cell lines failed to produce tumors in nude mice, failed to show a tumor-like pattern of growth in muscle organ culture, and failed to produce colonies in soft agarose. The remaining two cell lines showed different degrees of tumorigenicity in nude mice, and gave frankly positive results in the twoin vitro assays. In addition, one of these lines appeared to progress from potential to overt tumorigenicity. We conclude that acquisition of infinite life in primate cell lines is not invariably equivalent to the ability to form tumors.     

The question of animal culture

In this paper I consider whether traditional behaviors of animals, like traditions of humans, are transmitted by imitation learning. Review of the literature on problem solving by captive primates, and detailed consideration of two widely cited instances of purported learning by imitation and of culture in free-living primates (sweet-potato washing by Japanese macaques and termite fishing by chimpanzees), suggests that nonhuman primates do not learn to solve problems by imitation. It may, therefore, be misleading to treat animal traditions and human culture as homologous (rather than analogous) and to refer to animal traditions as cultural.     

A view from the bridge: Subjectivity,embodiment and animal minds

Abstract

In contemporary discussions of animal mind the difficulty of studying the nature of private, subjective awareness in animals is often seen as a barrier to a fuller understanding of animal experience. Relatively little work has focused on more recent psychological accounts of mind that emphasize its extended, embodied and social aspects. We examine some of the main conceptual difficulties in this area, and then consider a number of more embodied approaches. We suggest that a consideration of the nature of the animal-human relationship is crucial to a consideration of animal awareness.     

Empathy,home environment,and attitudes toward animals in relation to animal abuse

Abstract

Recent years have seen an increase in interest in the social, behavioral, psychological, and developmental correlates of animal abuse. The current study examined the relationships between empathy, family environment, attitudes toward animals and participation in animal abuse using a self-report methodology among a sample of college students. Within a sample of 286 college students, scores on the Attitudes Toward the Treatment of Animals Scale (ATTAS) were significantly correlated with scores on the Interpersonal Reactivity Index (IRI), a measure of empathy. The Caregiving subscale of the ATTAS was found to significantly differentiate abusers from non-abusers, and to differentiate abusers who reported having first engaged in abuse prior to age 13 years from those who reported having first engaged in abuse at age 13 or later. Abusers scored significantly higher on the IRI Fantasy subscale than did non-abusers. Men who reported a history of sexual abuse were more likely to report participating in animal abuse than were those who reported no history of sexual abuse. Finally, the effect of sexual abuse on animal abuse was found to be independent of individual differences in empathy and attitudes toward animals. The potential roles of trauma and fantasy in the genesis of animal abuse are discussed.     

Hepatic iron deposition in human disease and animal models

Iron deposition occurs in parenchymal cells of the liver in two major defects in human subjects (i) in primary iron overload (genetic haemochromatosis) and (ii) secondary to anaemias in which erythropolesis is increased (thalassaemia). Transfusional iron overload results in excessive storage primarily in cells of the reticule endothelial system. The storage patterns in these situations are quite characteristic. Excessive iron storage, particularly in parenchymal cells eventually results in fibrosis and cirrhosis. There is no animal model or iron overload which completely mimics genetics haemochromatosis but dietary iron loading with carbonyl iron or ferrocene does produce excessive parenchymal iron stores in the rat. Such models have been used to study iron toxicity and the action of iron chelators in the effective removal of excessive iron stores.     

模式动物与人类疾病的动物模型

围绕疾病所开展的基础研究已成为当今生物医学研究领域中的主要内容,而利用模式动物建立疾病的动物模型已是其研究的重要手段,对疾病的基础研究和转化研究均具有重要意义,已成为影响该领域发展的一个关键因素。我国医学研究领域中加强人类疾病动物模型研究既是一个现实问题,更是一个迫切问题,国家自然科学基金委员会医学科学部将在这方面予以倾斜支持。     

The relationship between the stockperson's personality and attitudes and the productivity of dairy cows

This study investigated the relationships amongst personality traits and attitudes of 311 dairy stockpeople and the milk yield they obtained. A questionnaire pack consisting of a big-five measure of personality (which includes the traits of extraversion, agreeableness, conscientiousness, emotional stability and intellect), a four-factor attitude questionnaire and associated demographic and production questions was posted out to Northern Ireland dairy farmers. Pearson correlations were used to assess the relationship between personality and attitudes and partial correlations were calculated between milk yield and these psychometric measures. The personality traits of agreeableness and conscientiousness were most strongly correlated to positive attitudes towards working with dairy cows. None of the stockpeople's personality traits were significantly correlated with the milk yield they obtained. Three of the attitude scales, however, were significantly correlated with milk yield; milk yield was related to higher levels of empathy and job satisfaction and lower levels of negative beliefs. These findings, along with previous research, suggest stockperson attitudes may be important in relation to dairy cow welfare and production.     

Wild Minds: What People Think about Animal Thinking

ABSTRACT

The question of how nonhuman animals think is pervasive in the scientific and popular media, yet there is an apparent lack of concordance between findings from research in animal cognition and how this information emerges in popular discourse. The present study investigated the way people conceive of animal thinking, in order to inform the development of an exhibit on animal minds that will address this issue and foster a deeper connection between people and animals. This two-part, sequential study of perceptions of animal thinking used qualitative interviews of visitors to the New York Hall of Science and Staten Island Zoo to develop a quantitative, online consumer survey of American museum visitors. The results show that American museum visitors vary in their perceptions of animal thinking, but appear to be open to new ideas about how animals might think. Participants' responses to the interviews revealed they could easily recognize survival strategies in wild animals, but had reservations about discussions of empathy, deception, and awareness. In addition, animals kept as pets or companion animals in Western culture were commonly perceived to have higher cognitive capacities for thinking than food or other domestic animals. Participants' responses to the online consumer survey appeared to focus on an overall concept of animal thinking, rather than different cognitive dimensions. Although participants were generally neutral in their responses, demographic analysis revealed participants who had dogs and/or cats, a college education, or watched nature shows were more likely to support the belief that animals can think. Participants who had children at home were less likely to support this belief. Further research is needed to determine how different kinds of thought processes are understood by general audiences and how demographic factors might influence perceptions of animal thinking.     

Assay of superoxide dismutase activity in animal tissues

Convenient assays for superoxide dismutase have necessarily been of the indirect type. It was observed that among the different methods used for the assay of superoxide dismutase in rat liver homogenate, namely the xanthine-xanthine oxidase ferricytochromec, xanthine-xanthine oxidase nitroblue tetrazolium, and pyrogallol autoxidation methods, a modified pyrogallol autoxidation method appeared to be simple, rapid and reproducible. The xanthine-xanthine oxidase ferricytochromec method was applicable only to dialysed crude tissue homogenates. The xanthine-xanthine oxidase nitroblue tetrazolium method, either with sodium carbonate solution, pH 10.2, or potassium phosphate buffer, pH 7·8, was not applicable to rat liver homogenate even after extensive dialysis. Using the modified pyrogallol autoxidation method, data have been obtained for superoxide dismutase activity in different tissues of rat. The effect of age, including neonatal and postnatal development on the activity, as well as activity in normal and cancerous human tissues were also studied. The pyrogallol method has also been used for the assay of iron-containing superoxide dismutase inEscherichia coli and for the identification of superoxide dismutase on polyacrylamide gels after electrophoresis.     

基因编辑动物模型在人类疾病研究中的应用

近年来,随着以CRISPR/Cas9为代表的多种CRISPR系统的开发和不断改进,基因编辑技术逐渐完善,并广泛应用于人类疾病动物模型的制备。基因编辑动物模型为人类疾病的发病机理、病理过程以及预防和治疗等方面的研究提供了重要的素材。目前,用于人类疾病研究的基因编辑动物模型主要有小鼠、大鼠为代表的啮齿类动物模型和以猪为代表的大动物模型。其中啮齿类动物在机体各方面与人类差别较大,且寿命短,无法对人类疾病的研究和治疗提供有效评估和长期追踪;而猪在生理学、解剖学、营养学和遗传学等各方面与人类更接近,是器官移植和人类疾病研究领域重要的动物模型。文中主要介绍了基因编辑动物模型在神经退行性疾病、肥厚心肌病、癌症、免疫缺陷类疾病和代谢性疾病等5种人类疾病研究中的应用情况,以期为人类疾病研究及相关动物模型的制备提供参考。     

Dither: A unifying model of the effects of visitor numbers on zoo animal behavior

Interest in the impact of human presence on the behavior and well-being of zoo and aquarium animals is increasing. Previous work has conceptualized the presence of zoo visitors as having one of three impacts on the behavior of animals in zoos: positive, negative, or neutral. Research suggests the same species may exhibit all three responses under different conditions, calling into question whether the positive/negative/neutral framework is the most useful way of considering visitor impact on animal behavior. Here we present a model of visitor effects that unifies these three predictions. Our model suggests that zoo-goers may provide a “dither effect” for some animals living in zoos. We posit animals may show nonlinear behavioral responses over a range of visitor densities, effectively exhibiting changes in both comfortable and anxiety-like behaviors under different levels of human presence. We tested this model during two COVID-19 related closures at the San Francisco Zoo, studying seven species for evidence of nonlinear relationships between visitor numbers and animal behavior. Our results support the dither effect acting in several species observed.     

The changing role of terrestrial and autochthonous organic matter in newly flooded lakes

Examination of the gut contents of mud-dwelling animals in three newly flooded lakes shows terrestrial organic matter to be a major component, particularly during filling of the lake basin. After filling is complete, a fall-off in total biomass of fauna is usually accompanied by significant reduction in the proportion of terrestrial detritus in favour of algal food. It is concluded that newly formed lakes pass through two phases. During flooding they are dependent on the terrestrial ecosystem. This is followed by a switch, immediately after filling, to more self-sustained autochthonous-based food chains.