- freely available
Vet. Sci. 2014, 1(1), 63-76; doi:10.3390/vetsci1010063
Published: 20 June 2014
Abstract: Common marmosets (Callithrix jacchus) are small non-human primates (NHPs) that are often used for respiratory research. Translational animal models of various pulmonary diseases in marmosets have been developed in favor of models in old world monkeys (OWM, e.g., rhesus or cynomolgus monkeys). The marmoset has the size of a rat (350–450 g), is easier to handle, and the husbandry, care, and management of colonies is much easier compared to OWMs. In contrast to rodents, marmosets provide a high homology to humans, which become especially visible in lung architecture and branching pattern. Features of inflammatory (e.g., COPD) pulmonary diseases can be modeled in marmosets as well the species is used to study bacterial and viral infection. Models for human melioidosis, tuberculosis, anthrax, as well as infections with SARS-associated coronavirus (SARS-CoV), influenza A virus and adenovirus are already established. Toxicological studies often use marmoset monkeys for the advantage of immunological identical twins that are produced by a Callitrichinae-specific placentation type, which ultimately causes blood chimerism. Relatively new approaches in gene therapy use marmosets for respiratory disease research. In this review we will give an overview of existing respiratory marmoset models and their impact on biomedical research.
The common marmoset (Callithrix jacchus) is a New World primate, native to northeastern Brazil and belongs to the family of the Callitrichidae. The species has several advantages when compared to Old World monkeys (OWM, e.g., rhesus (Macaca mulatta) or cynomolgus monkeys (M. fascicularis)). Its low body weight (350–450 g), for example, is comparable to the size of a rat (Figure 1) and makes marmosets an easy to handle and economically attractive NHP species for biomedical research [1,2]. Early sexual maturity and high reproductive efficacy allow fast breading capacities and therefore animal supply . Due to hematopoietic chimerism, marmosets but not OWMs, give birth to immunologically identical twins, which facilitates matched control study designs . The absence of herpes virus B (Macacine herpesvirus 1) in new world monkeys (NWMs), a virus that is highly lethal to man and commonly found in Asiatic macaques [2,5], contributes to a relative easy management of marmoset colonies. Table 1 provides an overview about species comparison between marmosets and the classically used Old World monkeys.
Marmosets are used as a non-rodent species in preclinical toxicology and safety studies. The close homology to humans makes the marmoset a suitable translational model for the human metabolism, enzyme structure and pharmacodynamic effects [3,6]. Furthermore, the high homology of marmoset and human immunological structures provides ground for predictive translational models of human diseases, e.g., to test new human specific biopharmaceuticals that do not find their target(s) in non-primate species [7,8].
The use of marmosets as an animal model for human lung diseases is based on its human-like structure of the lung parenchyma and lung architecture . Similar to humans and in contrast to the monopodial branching pattern in rodents, the marmoset’s bronchial tree shows dichotomous branching [10,11]. Marmosets’ alveolar size is comparable to other primates and monkey-specific islets of cartilage in the walls of bronchioles as well as highly alveolarized respiratory bronchioles can equally be found in the marmoset . Furthermore, the marmoset’s nasal cavity closely resembles the human nasal cavity’s morphology, a requirement for translational inhalation studies with a high predictive power for the human situation .
A comparable distribution of goblet cells, Clara cells and mixed type secretory cells in the tracheobronchial tree of humans and marmosets is described, whereas there are more Clara cells and less goblet cells in the proximal and distal conducting airway epithelium of marmosets . Another difference from the human situation is the distribution pattern of ciliated cells in the marmoset trachea with ciliated cells almost restricted to cartilage-free regions . Furthermore, ultrastructural alterations of cilia of the respiratory epithelium are a common background finding in marmosets and should be taken into account when analyzing respective data from respiratory studies .
Similarities in human and marmoset neural airway responses, e.g., a comparable reaction towards electrical field stimulation, favor marmosets over rodent models in studies of airway pharmacology . Yet, many aspects are still understudied and contrary results may cause uncertainty in the use of marmoset monkeys. For example, there are conflicting results regarding bronchoconstriction induced by the sensory neuron activator capsaicin in marmosets [16,17]. Despite these pitfalls, human-relevant bronchoconstrictors such as methacholine or histamine, the latter one which is inefficient in rodents, are potent in marmosets [18,19]. At the same time, serotonin, a powerful bronchoconstrictor in rodents, shows no effect in human and marmoset precision-cut lung slices , which underlines the importance of species homology for the predictive power of animal models. From the technical point of view, common respiratory techniques such as orotracheal intubation, bronchoscopy and bronchoalveolar lavage (BAL; uni- and bilateral) are well established in marmoset monkeys (Figure 2) [19,20,21].
2. Models of Lung Inflammation
Due to substantial similarities between the airway wall compartments of NHPs and humans, models of inflammatory lung diseases in nonhuman primates are expected to have advantages over classical rodent models that, to a high degree, lack those morphological similarities . A marmoset model of bleomycin-induced pulmonary fibrosis has been reported to mimic human adult respiratory distress syndrome (ARDS) . Transtracheal injection of bleomycin led to pulmonary fibrosis with elevated collagen deposition as well as increased lung lavage desmosine indicating lung elastin destruction . Lung injury was expressed by initial edema, followed by an acute interstitial inflammation . BAL showed a neutrophil dominated cell picture and lung function involved a decrease in lung compliance .
To model inflammatory features of human chronic obstructive pulmonary disease (COPD) and acute lung injury (ALI) a marmoset model of lipopolysaccharide (LPS)-induced acute lung inflammation was established recently . Animals showed, temporarily, a distinct pulmonary inflammation . Inflammation was characterized by an increase of pro-inflammatory cytokines such as tumor necrosis factor alpha (TNF-α) and macrophage inflammatory protein-1 beta (MIP-1β) . High numbers of neutrophils were found in BAL fluid 18 hours post LPS application . In a therapeutic intervention with orally administered anti-inflammatory drugs, dexamethasone and a phosphodiesterase-4 (PDE4) inhibitor (roflumilast), it was shown that lung inflammation could be suppressed significantly . The model therefore provides an interesting approach to test new human specific anti-inflammatory drugs . In addition to this, the same group of researchers characterized the model by comprehensive invasive lung function measurement . Compared to naïve animals, airway hyperresponsiveness towards the bronchoconstrictor methacholine occurred post-LPS provocation . Yet, the novel lung function device for marmoset monkeys, that allows inhalation of defined doses of provocative substances and simultaneous (real-time) recording of pulmonary data including key parameters such as lung resistance (RL) and dynamic compliance (Cdyn) , makes the marmoset an attractive model for human airway diseases and its treatment.
3. Models of Viral Infection
Marmosets have been utilized several times as a model for viral diseases [2,23]. While these models are not restricted to the respiratory tract, we in the following will focus on respiratory viral infection models. As a consequence of the SARS (Severe Acute Respiratory Syndrome) outbreak in 2002–2003, which killed almost 800 people , a marmoset model of the disease was developed that shares features with human SARS. Intratracheal application of SARS-associated coronavirus (SARS-CoV) induced an interstitial pneumonia attended by multinucleated syncytia, type 2 pneumocyte hyperplasia, and edema in the lung of infected animals . Similar to human infection, extrapulmonary pathological findings included multifocal hepatitis in all, mild diffuse colitis in most, and mild multifocal lymphocytic myocarditis in some of the infected animals . In addition to the clinical findings, the study showed that marmosets were susceptible to SARS-CoV infection by detection of viral RNA in lung tissue samples and localization of viral antigen in type I pneumocytes, mononuclear alveolar exudate, and multinucleated syncytial cells .
Marmosets were likewise susceptible to influenza A infection as shown in a study using the human pandemic virus A/California/07/2009 (H1N1pdm) . The virus did not only replicate successfully in infected animals but was also transmitted to a naïve individual in one case . Human-like influenza symptoms such as nasal secretion, sneezing and labored breathing accompanied infection in marmosets . Tissue damage was demonstrated by elevated BAL fluid protein levels . Proof of infection was obtained from recovery of viral RNA from BAL samples and nasal washout samples, using quantitative RT-PCR . Interestingly, sequences of the viral genome isolated from the respiratory tract of infected marmosets revealed that the applied H1N1pdm swarm did only need minimal adaption to cause productive infection, indicating that the species barrier between humans and marmoset influenza infection is low . Anti-H1N1pdm antibodies were detected in serum by hemagglutination inhibition assay . The model seems to provide the exceptional opportunity to study influenza infection in a, for the human situation, highly homologous animal model .
Adenovirus infections are known to cause respiratory illness and are responsible for pneumonia outbreaks in humans . Since human and nonhuman primate adenoviruses are closely related there is a risk of interspecies transmission [28,29]. Cross-species infection of marmosets with titi monkey (Callicebus cupreus) adenovirus (TMAdV) was shown . Marmosets which were intranasally inoculated with TMAdV, developed clinical signs of acute mild respiratory illness . A sustained infection was proven by positive TMAdV qPCR in nasal swab material and the detection of neutralizing antibody titers against the virus . Animals recovered completely within two weeks . Interestingly, TMAdV infection in titi monkeys produced a fulminant pneumonia with high mortality rates, whereas it caused a mild self-limiting respiratory infection in marmosets which resembled TMAdV infection in humans [30,31]. While the reason for this is, yet, unclear, Titi monkeys and marmosets belong to separate families  which could explain differences in clinical manifestations.
4. Models of Bacterial Infection
Several marmoset models of bacterial infection with respiratory implications are described with the objective to mimic the human situation and as alternatives to other nonhuman primates or rodent models. Legionnaires’ disease, a severe form of pneumonia, is caused by Legionella pneumophila. The disease is transmitted by inhaling aerosolized contaminated water. Bacteria endure in alveolar macrophages where they cause inflammation [33,34]. Marmosets infected with small particle aerosols of L. pneumophila developed pulmonary lesions which resemble those of human Legionnaires’ disease . Likewise several days after infection, bronchopneumonia emerging from respiratory and terminal bronchioles and oedemas in the alveoli were observed . Macrophage and polymorphonuclear leukocyte exudation into alveoli occurred and incorporated L. pneumophila were demonstrated by electron microscopy .
Melioidosis, induced by Burkholderia pseudomallei, is endemic and a considerable cause of mortality in Southeast Asia and northern Australia from where it is disseminating to other areas [37,38]. Treatment is difficult due to lack of vaccines and resistance to many antibiotics . The first NHP animal model for studies of respiratory melioidosis was established in common marmosets by Nelson and colleagues . Marmosets were highly susceptible to airborne infection with Burkholderia pseudomallei and developed human-like melioidosis including high mortality [40,41]. The rapidly progressive illness was associated with high fever, decreased activity and dyspnoea . Abnormal liver function enzymes were observed as well as a blood neutrophil increase followed by neutropenia through neutrophil recruitment to the lungs . Ultimately, bacteremia in the animals was observed in conjunction with an extensive bacterial load in the lung . Pathological findings included necrotizing pneumonia, extensive haemorrhage and expanded alveolar oedema in the marmoset lungs . Since melioidosis in the common marmoset resembled human Burkholderia pseudomallei infection this animal model is promising to study new therapeutic interventions against the disease . Thus, it is not surprising, that the melioidosis model in marmosets was used to test phosphoantigen treatment towards a T cell subset (γ9+δ2+) that is exclusively found in primate species [42,43].
For several potentially fatal human infections including anthrax clinical trials in man are not possible which highlights the urgent need for convincing animal models to test antimicrobials and vaccines [44,45]. Especially for testing human anthrax vaccines, NHP models may have benefits over classical rodent models . On the other hand, increased biosafety measures increase costs for housing and managing animals, which is particularly true for experiments with OWMs (e.g., rhesus and cynomolgus monkeys) . Therefore, the marmoset monkey may serve as an attractive alternative to anthrax models in macaques. Aerosol infection with the Bacillus anthracis Ames strain in marmoset monkeys caused clinical signs of anthrax including dyspnoea, decreased stimuli response and disorientation. Half of the animals had to be put to sleep due to clinical signs of infection 40–140 h post-challenge . Severely infected and therefore euthanized animals showed B. anthracis infection in several organs including the spleen and blood . Histopathological results included pulmonary oedema and haemorrhage as it was also observed in NHP and humans as well as acute interstitial pneumonia . Unlike in macaques or humans infection via aerosols caused no signs of meningitis in the common marmoset . Ciprofloxacin, an antibiotic used to treat anthrax in humans , was used for therapeutic intervention in infected marmosets and proved to be sufficient to prevent mortality .
Limitations of mouse  and cynomolgus models of tuberculosis (TB) led to the development of a marmoset model of Mycobacterium tuberculosis complex infection . Different strains of M. tuberculosis, partly emerging and drug resistant, were used to infect marmosets by aerosol exposure  which resulted in strain and dose dependent disease progression . The higher virulence of an M. tuberculosis Beijing strain compared to the Euro-American lineage in other animal models of TB was reinforced in the marmoset . In vivo computed tomography (CT) and positron emission tomography (PET) scans were used to quantify TB lung lesions over the course of infection . Both abnormal lung density, as revealed by CT, and glycolytic activity visualized by 2-deoxy-2-[18F]fluoro-D-glucose (FDG) uptake, increased as M. tuberculosis infection progressed . The highest bacterial load was found in the lung, spleen, liver, and lymph nodes of animals infected with M. tuberculosis Beijing strain K04 . Infected marmosets exhibited pulmonary lesions and tuberculous pneumonia similar to human TB . Furthermore, the study was interesting because it included chimeric marmoset twins to appraise reproducibility of infection and to assess strain-related differences. Twins infected with the same M. tuberculosis strains exhibited almost identical features of disease whereas twin animals exposed to different strains showed disparities specific for the group . Animals infected with an ancient M. africanum-like strain for example showed a more extensive extrapulmonary disease and some marmosets infected with the Euro-American lineage developed cavitary disease which is associated with recidivism in humans [50,51]. In fact, marmoset models of TB infection with various M. tuberculosis strains include the different characteristics of human TB infection and thus may help to develop new therapeutic strategies to fight the disease.
The severe pulmonary form of leptospirosis (SPFL) associated with pulmonary hemorrhages and respiratory failure causes high mortality rates in humans and represents a particular aggressive form of the emerging zoonosis, which is induced by the spirochete Leptospira [52,53,54]. Marmosets were inoculated intra peritoneal with Leptospira interrogans serovar Copenhageni which was formerly isolated from a fatal human SPFL case . Infection caused dehydration, weight loss and hepatic injury . Bacteria were recovered from blood samples of infected animals and antibodies against the bacterium indicated seroconversion . Gross pathology revealed hemorrhages on the pleural surface of the lung and histology showed intense intra-alveolar hemorrhages and thickened alveolar septa, caused by inflammatory cellular infiltrates as a response to infection on day 6, 9 and 12 post-inoculation . It was possible to depict leptospiral antigens in the affected areas of lung parenchyma with immunofluorescence techniques . In summary the disease elicited by experimental leptospirosis infection of marmosets with an SPFL-causing serovar resembled human courses of SPFL making the marmoset an attractive model species for human lung disease and pulmonary hemorrhages as a result of leptospirosis in particular .
5. Further Models with Respiratory Implications
For the reason that research on toxins needs reliable animal models as a surrogate for human trials  toxicological research and work safety is another field where marmoset models are useful. Sarin, known as a potent war gas, is an organophosphorus compound which leads to hyperstimulation of muscarinic and nicotinic receptors by inhibiting acetylcholinesterase (AChE) . Beside its unacceptable use as a mass destruction agent, there is a high risk of occupational exposure to low levels of sarin, e.g., for personnel that has to destroy stockpiles or any kind of medical staff which comes into contact with intoxicated victims [58,59]. Long-term low-level exposure to sarin vapor was modeled in marmosets using a novel sensitive apparatus that facilitated vapor generation, exposure in a chamber, and analysis via gas chromatography . Lowest observable effect levels (LOEL) were derived from sarin quantification in the blood . Ascertained LOELs were much lower than previously assumed recommending occupational exposure limits to be re-examined .
Another toxin, Aflatoxin B1 (AFB1) is mainly known to promote hepatocellular carcinoma . However, effects of this potent carcinogen are also observed in other parts of the body, such as the respiratory tract [61,62]. To investigate extra-hepatic sites of AFB1 accumulation and bioactivation in a primate model, marmosets were i.v. injected with radiolabelled 3H-AFB1 . Cytochrome P-450-dependent bioactivation of AFB1 in epithelia of the nasal olfactory mucosa and the upper respiratory tract was observed in marmosets  indicating that these tissues were potentially susceptible for AFB1 related carcinogenicity .
Gene therapy is an approach to encounter genetic disorders through replacing deficient by functional genes. In marmoset monkeys, beside hematologic applications , gene transfers to the retina facilitated by adeno-associated virus vectors , was demonstrated. Furthermore, gene transfer in marmosets was studied to evaluate the potential of this species for gene therapies in cystic fibrosis . Results indicated that marmoset lungs were successfully transduced in vivo using a VSV-G pseudo-typed HIV-based lentiviral vector . Expression of the LacZ reporter gene was observed 7 days after gene transfer in deep lying conducting airway epithelial cells as well as alveolar epithelial cells . Marmosets may represent a promising model species for gene therapy of human airway diseases such as cystic fibrosis . Also, the high reproductive rate of this NHP species compared to OWMs should not be underestimated and contributes to the use of marmosets in stem cell research and gene therapy.
While there are promising translational animal models in marmoset monkeys, the species also has its limitations compared to OWMs. The limited blood sample volume or lower rates of human antibody cross-reactivity are potential drawbacks that need to be considered. However, due to its characteristics, the marmoset monkey is especially attractive when it comes to experiments and models with a high demand of animal numbers or high reproduction rates that are needed to foster a quick generation turnover rate, e.g., in stem cell or gene therapy. Also, the cost-benefit ratio is exceptionally good regarding preclinical studies with the additional advantage of using immunological identical twins for controlled study designs. The marmoset’s close homology to humans is especially reflected in its lung architecture and airway branching pattern, which makes it a good model species for human lung diseases. Not only non-infectious, but also infectious disease models have been established in the marmoset with promising results.
|Table 1. Species comparison of advantages and disadvantages of macaque (rhesus, cynomolgus) and common marmoset animal models for respiratory diseases.|
|Weight||3.0–15.0 kg||0.35–0.45 kg|||
|Sexual maturity||41–66 months||18–24 months|||
|Gestation length||24 weeks||21 weeks|||
|Interbirth interval||12 months||6 months|||
|Housing requirements (floor area × height)||0.55 m2 × 1.5 m||2 m2 × 1.8 m||European Directive 2010/63/EU|
|Purchase price 2014||~6,000–10,000 €||~3,000–5,000 €||p.c.|
|Material costs (esp. drug compound) for pharmacology and toxicology studies||high||low|||
|Hematopoietic chimerism of dizygotic twins||no||yes|||
|Inter-individual variation of MHC class I and II loci||high||low|||
|Identical aa residues in average for immunity-related genes compared to human||95 ± 3.4||87 ± 5.4|||
|Susceptible for viral and bacterial infection with human-relevant pathogens||yes||yes|||
|Highly alveolarized respiratory bronchioles||yes||yes|||
|Bronchial branching pattern||dichotomous||[10,11]|
|Presence of Clara cells in the lung||not in trachea and major bronchi||in all airway segments|||
|Respiratory rate (under anesthesia)||~34 breaths/min||~27 breaths/min|||
|Latent Herpes Virus B infection||yes||no|||
|Wasting syndrome in captive colonies||absent||evident|||
|Complete clinical examination||feasible||feasible|||
|Blood sample volume (in vivo every two weeks)||48 mL||2.5 mL||Society for Laboratory
|BAL (uni- and bilateral)||yes||yes||[21,68,69]|
|BAL flush volume||10–15 mL||2 × 3 mL||[21,68,69]|
|Lung function assessment||yes||yes||[19,68,69]|
|Cross-reactivity of human-specific antibodies||frequent||limited|||
Conflicts of Interest
The authors declare no conflict of interest.
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