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Aerosol exposure to western equine encephalitis virus causes fever and encephalitis in cynomolgus macaques.

Cynomolgus macaques were exposed by aerosol to a virulent strain of western equine encephalitis virus (WEEV). Between 4 and 6 days after exposure, macaques had a significantly elevated temperature that lasted for 3-4 days. Clinical signs of encephalitis began as the body temperature decreased, and then they rapidly increased in severity. Cynomolgus macaques with clinical signs of encephalitis had elevated white cell counts in the blood caused mostly by increased numbers of segmented neutrophils and monocytes. Elevated serum glucose levels also correlated with the severity of the clinical signs of encephalitis. Three cynomolgus macaques died; immunohistochemical evidence of viral antigen was present in the brain and central nervous system (CNS). Microscopic analysis also revealed a marked lymphocytic infiltrate in the CNS. Cynomolgus macaques will serve as a useful model of aerosol exposure to WEEV for the evaluation of potential vaccine candidates.

Aerosols↗

A comparative evaluation of nasal and parenteral vaccine adjuvants to elicit systemic and mucosal HIV-1 peptide-specific humoral immune responses in cynomolgus macaques.

Cynomolgus macaques were immunized by either the intramuscular (i.m.) or intranasal (i.n.) route with a HIV-1 peptide-based immunogen (C4-V3 89.6P) alone, or formulated with novel adjuvants to evaluate the ability of the adjuvants to augment peptide-specific systemic and mucosal immune responses. A mutant cholera toxin, CT-E29H, or the combination of recombinant human IL-1alpha (rhIL-1alpha) protein and recombinant human GM-CSF (rhGM-CSF) protein were tested as adjuvants for i.n. immunization, while a stable emulsion of a synthetic monophosphoryl lipid A (MPL) analogue (RC529-SE) plus rhGM-CSF protein was tested as an adjuvant for i.m. immunization. Macaques immunized i.n. with peptide alone failed to elicit an anti-C4-V3 89.6P antibody response in serum. In contrast, all the tested peptide/adjuvant formulations elicited peptide-specific immune responses. RC529-SE/rhGM-CSF elicited the highest peak anti-peptide IgG geometric mean titer in serum (1:32,768 at week 25) followed by rhIL-1alpha/rhGM-CSF (1:1217 at week 10) and CT-E29H (1:256 at week 25). Measurable SHIV neutralizing antibody responses were detectable in only one macaque immunized i.m. with peptide formulated with RC529-SE/rhGM-CSF. Macaques immunized by the i.n. route with peptide in combination with CT-E29H failed to elicit measurable antibody responses at nasal or genital mucosal surfaces. In contrast, antibody responses at the nasal and genital mucosa were detected in macaques immunized by the i.n. route with peptide in combination with rhIL-1alpha/rhGM-CSF. However, antibody responses at the nasal and genital mucosa were highest in macaques immunized parenterally with peptide in combination with the adjuvants RC529-SE/rhGM-CSF. These results suggest that parenteral vaccine administration in combination with the appropriate adjuvant formulation can elicit vaccine-specific humoral immune responses in both systemic and mucosal compartments.

AIDS Vaccines↗

Exposure to the dioxin 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) induces squamous metaplasia in the endocervix of cynomolgus macaques.

Female cynomolgus macaques (n = 11) were treated orally with graded doses of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). Cervical tissue was recovered at necropsy 1.2-2.7 years later and examined using routine histopathology. Results were compared histologically with cervical tissue from untreated, age- and parity-matched controls. Significant squamous epithelial metaplasia was observed in the endocervix of 9 of 11 TCDD-treated animals, and the degree of severity was dose dependent. In contrast, minimal or no pathological changes were observed in eight of nine control animals and one animal had only mild squamous metaplasia. These results suggest that TCDD exposure induces epithelial transdifferentiation in the primate cervix. Consequently, the TCDD-treated macaque may serve as a predictable animal model for the study of cervical epithelial transdifferentiation and for examining the relationship between squamous metaplasia and cervical oncogenesis both at the cellular and at the molecular level.

Administration, Oral↗

The effect of satiety on responses of gustatory neurons in the amygdala of alert cynomolgus macaques.

An alert cynomolgus macaque was fed a sweet solution to satiety as the activity of a gustatory neuron in the amygdala was recorded to that solution and to four other taste stimuli. This experiment was conducted a total of 14 times in two monkeys. The responses of individual neurons to the satiety stimuli were suppressed by as little as 1%, and as much as 100% by the induction of satiety (mean suppression = 58%). Nine of the 14 cells responded to the satiety solution with excitation, and their responses were suppressed by a mean of 62% by satiety. Five neurons responded with inhibition, and their responses were suppressed by a mean of 50%. Responses to other taste stimuli, not associated with satiety, were affected to a lesser extent. The amygdala is a taste relay between the primary gustatory cortex, where satiety has no influence on responses to taste stimuli, and the lateral hypothalamic area where the effect of satiety is total. The data presented here indicate that the amygdala is a functional as well as anatomical intermediary between these two areas, and serves as a stage in the process through which sensory stimuli are imbued with motivational significance.

Amygdala↗

MhcDRB-sequences from cynomolgus macaques (Macaca fascicularis) of different origin.

Cynomolgus macaques are frequently used in biomedical research. However, in contrast to their closest relative, the rhesus macaque, little is known about their Mhc genes except for the DQB1 locus. In this study, 33 DRB-sequences belonging to 17 allelic lineages were detected in a total of 68 macaques, 58 originating from Mauritius and 10 from China. The majority of the sequences were detected in the few macaques from China, confirming the low degree of genetic variation in macaques from Mauritius. In summary, the DRB region in cynomolgus macaques is polymorphic. The sequences belong in general to the same allelic lineages as in their closest relative, the rhesus macaque. Two exon 2 DNA sequences were identical in both species and may represent a trans-species origin. In addition, protein sequences of members of the DRB*W1 lineage seem to be rather conserved in the three macaque species examined so far. Six DRB-haplotypes were detected in the macaques from Mauritius. While single DRB-alleles or some protein sequences seemed to be conserved among macaque species, we could not detect any evidence for a trans-species conservation of a complete DRB region. Overall, the data indicate that reorganization of the DRB region by recombination is a major force in creating diversity in cynomolgus macaques as it is in rhesus macaques.

Amino Acid Sequence↗

Spontaneous leprosy in a wild-caught cynomolgus macaque.

Naturally occurring Mycobacterium leprae has been previously documented in only two species of nonhuman primates from West Africa--the chimpanzee and the sooty mangabey. We report here the first known case of spontaneous leprosy in an Asian macaque. A wild-caught cynomolgus macaque imported from The Philippines developed a reaction to a tuberculin skin test after 3 years at the California Regional Primate Research Center (CRPRC), University of California-Davis, Davis, California, U.S.A. Biopsies of concurrent skin lesions suggested a cutaneous mycobacterial infection. Diagnosis of the infection was obtained by a polymerase chain reaction (PCR) assay specific for M. leprae. Clinical presentation, histopathological findings, and ELISA serology for M. leprae-specific PGL-I and to the LAM mycobacterial antigens were consistent with those of human borderline (BB) leprosy. Longitudinal serologic data suggest that the cynomolgus macaque had subclinical leprosy at the time of arrival in the CRPRC quarantine. Intradermal tuberculin testing is the traditional method for screening nonhuman primate populations for mycobacterial infections. Exposure to nontuberculous mycobacteria, such as M. leprae, amy sensitize some individual primates to nonspecific mycobacterial antigens, resulting in false-positive tuberculin reactions. Susceptibility of the cynomolgus macaque and other nonhuman primates to M. leprae should be re-evaluated. Cynomolgus macaques and, possibly, other nonhuman primates may serve as valuable experimental models of leprosy in humans.

Animals↗

Cloning and sequencing of cynomolgus macaque CCR3, GPR15, and STRL33: potential coreceptors for HIV type 1, HIV type 2, and SIV.

The characterization of several seven-transmembrane G protein-coupled receptors, which function as coreceptors for HIV-1, HIV-2, and/or SIV, has opened up a whole new area of AIDS research. Animal models that have played a central role in the understanding of lentivirus pathogenesis and the design of novel vaccine strategies may also be invaluable in studying the role of these secondary receptors in infection and disease progression. However, since it is known that minor species-specific sequence changes in CCR3 and STRL33 affect their ability to act as coreceptors for HIV-1, HIV-2, and/or SIV, it is important to ascertain whether the relevant receptors function as expected in the animal model of choice. Many studies have been performed on the function of rhesus macaque receptors, but not on the cynomolgus macaque equivalents. Both species are used as animal models for lentivirus pathogenesis, but since there are differences in their susceptibility to viral infection, we felt it was important for information to be available for both rhesus and cynomolgus macaque receptors. The sequence of three cynomolgus macaque receptors, CCR3, GPR15, and STRL33, are presented in this sequence note. These sequences are compared with already published human and rhesus macaque homologs. Functional studies are currently being performed on these three cynomolgus macaque receptors to determine their ability to function as coreceptors for HIV-2, SIV, and/or SHIV isolates.

Amino Acid Sequence↗

A BAC-based contig map of the cynomolgus macaque (Macaca fascicularis) major histocompatibility complex genomic region.

The construction of a cynomolgus macaque (Macaca fascicularis, Mafa) BAC library for genomic comparison between rhesus and cynomolgus macaques is necessary to promote the cynomolgus macaque as one of the important experimental animals for future medical and biological research. In this paper, we constructed a cynomolgus macaque BAC library and a map of the MHC (Mafa) genomic region for comparison of the genomic organization and nucleotide similarities between the human, the chimpanzee, and the rhesus macaque. The BAC library consists of 221,184 clones with an average insert size of 83 kb, providing a sixfold coverage of the haploid genome. A total of 114 BAC clones and 54 PCR primer sets were used to construct a 4.3-Mb contig of the MHC region. Diversity analysis of genomic sequence from selected subregions of the MHC revealed that the cynomolgus sequence varied compared to rhesus macaque, human, and chimpanzee sequences by 0.48, 4.15, and 4.10%, respectively. From these findings, we conclude that the BAC library and Mafa genomic map are useful tools for genome analysis and will have important applications for comparative genomics and identifying regions of consequence in medical research.

Animals↗

Specific detection of human coagulation factor IX in cynomolgus macaques.

After screening for species-specific antihuman factor (F)IX monoclonal antibodies, we found that antibody 3A6 did not bind to cynomolgus FIX. The 3A6 epitope was found to include Ala262 of human FIX. The 3A6 antibody was used as a catching antibody in an enzyme immunoassay (EIA) for specific detection of human FIX in cynomolgus macaque plasma. No significant increase of substrate hydrolysis was observed when EIA buffer containing cynomolgus macaque plasma was subjected to the 3A6-based EIA. Addition of up to 30% cynomolgus macaque plasma or canine plasma to the assay did not alter detection of human FIX. Three cynomolgus macaques were injected with human FIX (10 U kg-1; i.v.) and the circulating human FIX was quantified in the macaque plasma. The FIX level in the circulation increased to 470 +/- 37.6 ng mL-1 at 1 h after the injection and gradually decreased to 1.79 +/- 1.1 ng mL-1 by day 5, which is approximately 0.06% of the normal human plasma FIX concentration. These data suggest that the cynomolgus macaque can be used as a primate model for studying hemophilia B gene therapy by transduction of macaque organs with vectors to express human FIX in vivo and detection of human FIX using the 3A6 monoclonal antibody.

Animals↗

The role of Branhamella catarrhalis in the "bloody-nose syndrome" of cynomolgus macaques.

During a 15-month period, 25 cynomolgus macaques (Macaca fascicularis) at the Johns Hopkins University were observed to have nasal discharge. Fifteen (60%) of these animals had positive nasal cultures for Branhamella catarrhalis. Clinical signs associated with infection by this bacterium were sneezing, epistaxis, and mucohemorrhagic nasal discharge. Treatment with antibiotics resulted in prompt resolution of clinical signs. Post-therapeutic nasal cultures were negative for B. catarrhalis. Two groups of clinically normal, culture-negative, cynomolgus macaques were inoculated with natural isolates of B. catarrhalis which had been passaged in culture for various amounts of time. Five of the eight animals inoculated became culture-positive and had mild nasal discharge. Presence of blood on nasal swabs was indicative of infection with B. catarrhalis. Three of the inoculated animals had post-swabbing epistaxis. This report documents the role of B. catarrhalis as an upper respiratory pathogen in the cynomolgus monkey which causes mild self-limiting disease reminiscent of the so-called "Bloody-Nose Syndrome." In addition to the obvious clinical significance of this finding to primate clinicians, development of an animal model for human disease caused by this organism may be possible.

Animals↗

Methods for predicting sexual maturity in male cynomolgus macaques on the basis of age, body weight, and histologic evaluation of the testes.

In pharmaceutical drug safety testing, sexual maturity is an important experimental parameter. Histologic immaturity of the tissues of the reproductive system can interfere with the interpretation of compound-related effects on the reproductive organs. In female cynomolgus macaques, determination of sexual maturity is simplified by the presence of a menstrual cycle. For male cynomolgus macaques, predicting maturity is much more difficult. In this study, we evaluated methods that would reliably predict sexual maturity in male cynomolgus macaques. The results of histologic examination of testes of control male cynomolgus macaques used for drug safety studies were examined retrospectively for evidence of sexual maturity. These data were compared with age and body weight determinations to establish statistical models for determining the probability that a male cynomolgus macaque is sexually mature. This model presents a simple prospective method of predicting sexual maturity in male cynomolgus macaques.

Aging↗

Histologic and immunohistochemical characterization of spontaneous pituitary adenomas in fourteen cynomolgus macaques (Macaca fascicularis).

Pituitary adenomas were identified in 14 of 491 (2.9%) cynomolgus macaques evaluated from 1994 to 2004. Cases included male (8) and female (6) cynomolgus macaques ranging from 18 to 32 years of age. Seven of the pituitary adenomas caused gross enlargement of the pituitary gland that was visible on postmortem examination, whereas the remaining 7 were multifocal microadenomas identified on histologic examination. A total of 35 adenomas were identified in the 14 macaques, 6 of which were being treated for diabetes mellitus. Mean (+/- SD) pituitary weight was 0.31 +/- 0.42 g, compared with 0.07 +/- 0.02 g for 430 historical control animals (P < 0.0001). Immunohistochemical staining for follicle-stimulating hormone, luteinizing hormone, prolactin, human growth hormone, thyroid-stimulating hormone, and adrenocorticotropic hormone was applied to pituitary tissue from all cases. Immunostaining revealed 22 of 35 (62.9%) lactotroph adenomas, 5 of 35 (14.3%) plurihormonal cell adenomas, 3 of 35 (8.6%) corticotroph adenomas, 2 of 35 (5.7%) null cell adenomas, 1 of 35 (2.9%) somatotroph adenomas, 1 of 35 (2.9%) mixed corticotroph-somatotroph adenomas, 1 of 35 (2.9%) mixed lactotroph-corticotroph adenomas, 0 of 35 gonadotroph adenomas, and 0 of 35 thyrotroph adenomas. This study represents the first extensive retrospective case series performed to evaluate the histologic and immunohistochemical characteristics of pituitary adenomas in cynomolgus macaques. Our findings indicated that macaque pituitary adenomas frequently had mixed histologic appearance and hormone expression, and that, similar to human pituitary adenomas, prolactin-secreting neoplasms were the most prevalent type.

Adrenocorticotropic Hormone↗

Novel cynomolgus macaque MHC-DPB1 polymorphisms in three South-East Asian populations.

Cynomolgus macaques (Macaca fascicularis, Mafa), alias the crab-eating monkeys or long-tailed macaques, live across a vast range of South-East Asia. These non-human primates have emerged as important animal models in infectious and chronic diseases and transplantation studies, necessitating a more extensive characterization of their major histocompatibility complex polymorphic regions. The current information on the polymorphic variation or diversity of the Mafa-DPB1 locus is largely limited in comparison with the more commonly studied rhesus macaque DPB1 locus. In this article, to better elucidate the degree and types of polymorphisms and genetic differences of Mafa-DPB1 locus among three South-East Asian populations and to investigate how the allele differences between macaques and humans might affect their respective immune responses, we identified 40 alleles within exon 2 of the Mafa-DPB1 locus by DNA sequencing using 217 individuals. We also performed evolutionary and population analyses using these sequences to reveal some population-specific alleles and trans-species allelic conservation between the cynomolgus macaques and the rhesus macaques. Of the 40 new alleles, eight belong to a newly identified lineage group not previously found in the rhesus macaque species. This allele information will be useful for medical researchers using the cynomolgus macaques in disease and immunological studies.

Alleles↗

Enterically transmitted non-A, non-B hepatitis: serial passage of disease in cynomolgus macaques and tamarins and recovery of disease-associated 27- to 34-nm viruslike particles.

An experimental model of enterically transmitted non-A, non-B hepatitis (ET-NANBH) was established in tamarins (Saguinus mystax mystax) and cynomolgus macaques (Macaca fascicularis). First-passage animals were inoculated with two different stool suspensions obtained from human patients with well-defined ET-NANBH that originated from Burma and Pakistan, where epidemics of ET-NANBH occur. Both inocula contained 27- ato 34-nm-diameter viruslike particles (VLPs) that were specifically aggregated by acute-phase ET-NANBH sera. ET-NANBH was subpassaged in both tamarins and cynomolgus macaques by using pools of stool suspensions from first-passage animals. One additional passage of disease in cynomolgus macaques resulted in a significantly shortened incubation period and increased severity of disease. VLPs similar to those found in the human inocula were observed in stool specimens of first-, second-, and third-passage cynomolgus macaques and in first- and second-passage tamarins. Our findings indicate that cynomolgus macaques are particularly suitable experimental models for studies of human ET-NANBH. The 27- to 34-nm VLPs found in infected human and primate stools appear to be etiologically linked to disease.

Animals↗

Selenium kinetics, placental transfer, and neonatal exposure in cynomolgus macaques (Macaca fascicularis).

Forty pregnant cynomolgus macaques were treated daily from gestational day 20 to 50 by nasogastric intubation of 0, 25, 150, or 300 micrograms selenium as L-selenomethionine/kg body weight. In each group, 7-8 pregnancies were terminated by hysterotomy at gestational day 100 +/- 2 and the fetuses were examined, while 2-3 pregnancies in each group were allowed to proceed to term. Selenium and soluble glutathione peroxidase were measured in: maternal, neonatal, and fetal plasma and erythrocytes; fetal kidney, liver, muscle, and placenta; and maternal breast milk. The area under the multidose maternal plasma selenium concentration:time curve, the maximum maternal plasma selenium concentration, and the maternal urinary selenium excretion rates were proportional to the L-selenomethionine dose. Selenium concentrations in all fetal and neonatal, tissues were also proportional to maternal L-selenomethionine dose. Glutathione peroxidase was affected only in maternal erythrocytes, fetal kidney, and neonatal plasma. The selenium concentration in fetal plasma was an average 33% of that in maternal plasma. Although selenium concentrations in macaque milk were doubled by the highest dose, intrauterine selenium accumulation accounted for the majority of the neonatal selenium body burden. Despite the elevated selenium concentrations in fetal tissues, neonatal blood, and milk, no deleterious effects on neonates were observed. These results suggest that primate fetuses are well protected against selenium toxicity arising from high maternal L-selenomethionine intakes.

Animals↗

A multiple schedule model of limited access drinking in the cynomolgus macaque.

The present study reports on the development of a multiple schedule procedure of oral ethanol self-administration in cynomolgus macaques. Six adult cynomolgus macaques (four female, two male) were trained to self-administer ethanol and water under a 60 min, four-component multiple schedule of ethanol and water access with 1 g food pellets presented every 900 s (fixed-time 900 s). Water was available for the first and third 15 min components, ethanol in the second and fourth components. Total ethanol dose was stable at between 1-1.25 g/kg at ethanol concentration of 4%, 6% and 8%. Subsequently water was replaced with a sweetened drink (sugar-free Tang powder, General Foods). Ethanol and Tang were self-administered in similar volumes and both served as reinforcers compared with water. Acute pretreatment with 0.25 to 1.5 g/kg of intragastrically gavaged (i.g.) ethanol failed to alter ethanol or Tang self-administration significantly despite producing mean blood ethanol levels of up to 199 mg/dl when combined with self-administered ethanol. However, 1.0 g/kg i.g. ethanol administered for 15 consecutive days significantly decreased ethanol self-administration by 23%. The results suggest that ethanol self-administration under a multiple schedule is insensitive to alteration by acute ethanol pretreatment, but can be decreased by more prolonged chronic ethanol pretreatment.

Alcohol Drinking↗

Estradiol dynamics during superovulation are associated with oocyte quantity and maturation stage in cynomolgus macaques.

OBJECTIVE: To examine whether dynamic changes in circulating estradiol during ovarian stimulation are associated with the number and maturation status of oocytes recovered in cynomolgus macaques. DESIGN: Observational study based on retrospective analysis of ovarian stimulation cycles. SUBJECTS: Sixty-six ovarian stimulation cycles from adult female cynomolgus macaques (Macaca fascicularis) housed at the Primate Resources Center. EXPOSURE: Animals underwent a standardized gonadotropin-based ovarian stimulation protocol. Circulating estradiol concentrations were measured at multiple time points during the late follicular phase before oocyte recovery, and estradiol dynamics were defined as the difference between the maximum and minimum values observed across these measurements. MAIN OUTCOME MEASURES: Total number of oocytes recovered per stimulation cycle, number of mature oocytes at the metaphase two stage, and proportional distribution of oocyte maturation stages. RESULTS: Dynamic changes in estradiol concentrations were positively associated with the total number of oocytes recovered per cycle (correlation coefficient 0.45). A similar but weaker association was observed with the number of mature oocytes recovered (correlation coefficient 0.36). In contrast, estradiol dynamics were not associated with the proportional distribution of oocyte maturation stages. Donor age and body weight were not significantly associated with oocyte recovery outcomes. CONCLUSION: Dynamic changes in circulating estradiol during ovarian stimulation primarily reflect the quantitative dimension of ovarian response in cynomolgus macaques, with limited relevance for the maturation stage composition of recovered oocytes.

Animals↗

Pharmacokinetics of the antimalarial drug, AQ-13, in rats and cynomolgus macaques.

The purpose of this study was to evaluate the bioavailability and pharmacokinetics of a new antimalarial drug, AQ-13, a structural analog of chloroquine (CQ) that is active against CQ-resistant Plasmodium species, in rats and cynomolgus macaques. Sprague-Dawley rats (n = 4/sex) were administered a single dose of AQ-13 intravenously (i.v.) (10 mg/kg) or orally (20 or 102 mg/kg). Blood and plasma samples were collected at several timepoints. AQ-13 achieved C(max) after oral administration at approximately 3 to 4 h and could be detected in blood for 2 to 5 days after oral administration. The ratio of area under the curve (AUC) values at the high and low dose for AQ-13 deviated from an expected ratio of 5.0, indicating nonlinear kinetics. A metabolite peak was noted in the chromatograms that was identified as monodesethyl AQ-13. Oral bioavailability of AQ-13 was good, approximately 70%. The pharmacokinetics of AQ-13 was also determined in cynomolgus macaques after single (i.v., 10 mg/kg; oral, 20 or 100 mg/kg) and multiple doses (oral loading dose of 50, 100, or 200 mg/kg on first day followed by oral maintenance dose of 25, 50, or 100 mg/kg, respectively, for 6 days). The AUC and C(max) values following single oral dose administration were not dose proportional; the C(max) value for AQ-13 was 15-fold higher following an oral dose of 100 mg/kg compared to 20 mg/kg. Monodesethyl AQ-13 was a significant metabolite formed by cynomolgus macaques and the corresponding C(max) values for this metabolite increased only 3.8-fold over the dose range, suggesting that the formation of monodesethyl AQ-13 is saturable in this species. The bioavailability of AQ-13 in cynomolgus macaques following oral administration was 23.8% for the 20-mg/kg group and 47.6% for the 100-mg/kg group. Following repeat dose administration, high concentrations of monodesethyl AQ-13 were observed in the blood by day 4, exceeding the AQ-13 blood concentrations through day 22. Saturation of metabolic pathways and reduced metabolite elimination after higher doses are suggested to play a key role in AQ-13 pharmacokinetics in macaques. In summary, the pharmacokinetic profile and metabolism of AQ-13 are very similar to that reported in the literature for chloroquine, suggesting that this new agent is a promising candidate for further development for the treatment of chloroquine-resistant malaria.

Administration, Oral↗