In baboons, Papio sp. neoplasms tend to affect the hematopoietic system most commonly, with rare documentation of myxomatous neoplasms. In contrast, women can develop myxomatous masses within deep peripelvic tissues with some frequency during their reproductive years.
We have identified and examined, retrospectively, myxomatous perineal masses in twelve female baboons within one research facility and compared their histopathologic, immunohistochemical and electron microscopic features to their human variants.
Our results indicate that these myxomatous neoplasms, in humans and non-human primates, share common features.
Further research, particularly molecular genetic analysis, may be needed to identify the baboon as a true animal model for myxomatous perineal neoplasms.
Aggressive angiomyxoma; angiomyofibroblastoma; cdk4; estrogen receptor; MDM2; progesterone receptor
Colonic amyloidosis has been previously reported in animals, however its prevalence rate has not yet been explored. The aim of the present work was to assess the prevalence of colonic amyloidosis at the Southwest National Primate Research Center since 1986.
Materials and Methods
Colonic amyloidosis was sought in autopsy material from baboons collected under the diagnosis of systemic amyloidosis.
Between 1986 and 2007, a mean of 3,315 baboons per year (range 2,578–3,931) were housed at the Southwest National Primate Research Center. After examination, colonic amyloidosis was detected in 6 (6.8% ) of the 88 baboons with systemic amyloidosis, yielding a prevalence rate of 0.27 cases per year since 1986. Colonic amyloid deposits were found in the interstitial aspect of the lamina propria, often replacing normal mucosal crypts of Lieberkuhn.
It was observed that only 6.8% of animals with systemic amyloidosis examined between 1986 and 2007 developed colonic amyloidosis. The apparent natural resistance to colonic amyloidosis in baboons presenting systemic amyloidosis deserves to be further investigated.
Amyloidosis; colon; baboon
For anatomists, the cardia is a portion of the stomach. However, at the histological level, the cardiac mucosa, described as columnar-lined with mucus-producing glands (CLMMG), is for some pathologists part of the stomach (already present at birth) and for others a metaplastic change of the esophagus induced by gastro-esophageal reflux (GER).
Materials and Methods
The distal esophagus and the proximal stomach of 5 adult male baboons were removed en bloc at autopsy. The distance between the most distal part of the squamous epithelium of the esophagus and the first oxyntic fundic gastric gland (representing the entire CLMMG) was assessed using an ocular microscale.
The length of the CLMMG varied from 1.2 mm to 12.4 mm. The CLMMG had replaced the squamous epithelium of the distal esophagus in all 5 baboons.
Regurgitation with rumination is a natural physiological, daily, recurrent process in baboons that leads to GER. The luminal cytoplasmic vacuoles with neutral mucins contained in the columnar cells and the neutral mucins produced by the mucin glands buffer the low pH of the gastric juices that reflux into the distal esophagus. This protective action against the acid refluxate cannot be achieved by the squamous epithelium.
The results of this preliminary investigation suggest that in baboons, CLMMG is an adaptation process of the esophageal mucosal to the low pH microenvironment conveyed by protracted GER.
Metaplasia; esophagus; reflux; baboons
Systemic amyloidosis, caused by abnormal tissue accretion of plasma proteins, affects several organs of the gastrointestinal (GI) tract. Gastric amyloidosis, rare in humans, has only been reported once in animals.
Materials and Methods
Gastric amyloidosis was sought for in baboons with systemic amyloidosis.
During the past 22 years (between January 1986 and January 2007) a mean of 3,315 baboons/year (range 2,578–3,931) were housed at the Southwest National Primate Research Center. Gastric amyloidosis was found in 9 (10.2%) of the 88 baboons having a diagnosis of systemic amyloidosis. Consequently, the prevalence of gastric amyloidosis occurring since 1986 at this facility was 0.41 baboons/year. Gastric amyloid deposits were found in the interstitial aspect of the lamina propria, replacing normal mucosal structures, in the submucosal stroma along the interface with the muscularis mucosae and in the interstitial tissue of submucosal lymphoid aggregates. In one of the animals, lumps of amyloid deposits with giant cells were found in the gastric mucosa.
Baboons with systemic amyloidosis usually show increasing frequency of amyloid deposits in the liver, large intestine, lymph nodes, spleen and the small intestine. We now demonstrate that it may also involve the stomach. Why certain organs of the GI tract in baboons are more susceptible than others to be affected by the process of systemic amyloidosis remains unexplained. The apparent natural resistance of the stomach of baboons to be affected by systemic amyloidosis deserves further investigation. The review of the literature indicates that this is only the second report on gastric amyloidosis in baboons.
Amyloidosis; stomach; baboons
The frequency of histological changes mimicking those described for reflux esophagitis in humans was assessed in a cohort of non-human primates (NHP).
Materials and Methods
A total of 121 consecutive esophagi (from 103 baboons and 18 macaques) were classified according to Ismail-Beiji for reflux esophagitis in humans into grade 1, grade 2 and grade 3 esophagitis.
Histological features compatible with reflux esophagitis were found in 28.2% of the baboons and in 22.2% of the macaques. Esophagitis grade 1 was more common in baboons (24%) than in macaques (6%), while esophagitis grade 2 was more common in macaques (17%) than in baboons (2%).
Although the prevalence of reflux esophagitis in man is at least 2%, only a fraction of patients demonstrate histological features consistent with grades 1, 2 or 3 esophagitis. Hence, the finding that 27% of a cohort of consecutive, unselected NHP had grades 1, 2 or 3 esophagitis at histology is remarkable. The possible causes for the difference between species, such as the oblique position often adopted by NHP during the gastric phase of digestion, the diet, regurgitation and subsequent re-ingestion, as well as the stress of NHP when kept in captivity, are reviewed.
Esophagitis; reflux; non-human primates indent
Glands with glassy cells (GGCs) were recently found in 1.8% of patients showing Barrett’s mucosa in esophageal biopsies. Similar GGCs were more recently detected in a baboon having glandulo-metaplastic esophageal mucosa (GMEM). The aim was to assess the frequency of baboons with GMEM having GGCs.
Materials and Methods
GGCs were searched for in 68 consecutive baboons having GMEM. Sections were stained with H&E and with alcian blue (pH 2.5), to detect sialomucins in goblet cells (a marker of Barrett’s mucosa in GMEM).
Two out of the 68 baboons with Barrett’s mucosa (2.9%) showed GGCs.
In similarity to humans, the Barrett’s mucosa in baboons may show GGCs. Although the significance of GGCs in baboons (and in humans) remains poorly understood, their presence might not be a fortuitous event but linked to the molecular events leading to the development of intestinal metaplasia in Barrett’s mucosa, a known pre-neoplastic mucosal change in the distal esophagus in humans.
Nonhuman primate; pathology; disease; intestinal metaplasia
The primary purpose of the present set of studies was to provide a direct comparison of the effects of the angiotensin-converting enzyme inhibitor enalapril and the angiotensin receptor blocker losartan on body composition, physical performance, and muscle quality when administered late in life to aged rats. Overall, enalapril treatment consistently attenuated age-related increases in adiposity relative to both placebo and losartan. The maximal effect was achieved after 3 months of treatment (between 24 and 27 months of age), at a dose of 40 mg/kg and was observed in the absence of any changes in physical activity, body temperature, or food intake. In addition, the reduction in fat mass was not due to changes in pathology given that enalapril attenuated age-related increases in tumor development relative to placebo- and losartan-treated animals. Both enalapril and losartan attenuated age-related decreases in grip strength, suggesting that changes in body composition appear dissociated from improvements in physical function and may reflect a differential impact of enalapril and losartan on muscle quality. To link changes in adiposity to improvements in skeletal muscle quality, we performed gene array analyses to generate hypotheses regarding cell signaling pathways altered with enalapril treatment. Based on these results, our primary follow-up pathway was mitochondria-mediated apoptosis of myocytes. Relative to losartan- and placebo-treated rats, only enalapril decreased DNA fragmentation and caspase-dependent apoptotic signaling. These data suggest that attenuation of the severity of skeletal muscle apoptosis promoted by enalapril may represent a distinct mechanism through which this compound improves muscle strength/quality.
Age-related adiposity; Body composition; Sarcopenia; Renin–angiotensin system; Physical function; Muscle quality
Baboons are useful animal models for biomedical research, but the natural pathology of the baboon is not as well defined as other non-human primates.
A computer search for all morphologic diagnoses from baboon necropsies at the Southwest National Primate Research Center was performed and included all the natural deaths and animals euthanized for natural causes.
A total of 10,883 macroscopic or microscopic morphologic diagnoses in 4297 baboons were documented and are presented by total incidence, relative incidence by sex and age-group, and mean age of occurrence. The most common diagnoses in descending order of occurrence were hemorrhage, stillborn, amyloidosis, colitis, spondylosis, and pneumonia. The systems with the most diagnoses were the digestive, urogenital, musculoskeletal, and respiratory.
This extensive evaluation of the natural pathology of the baboon should be an invaluable biomedical research resource.
diseases; monkey; non-human primates; pathology; spontaneous; survey
Congenital transmission of Trypanosoma cruzi has been described in humans and experimental work has been conducted with mice, but not with non-human primates (NHPs).
We conducted a retrospective study of female baboons (Papio hamadryas spp.) naturally seropositive or seronegative for T. cruzi with history of fetal loss, and we report a stillbirth in a cynomolgus macaque (Macaca fascicularis) with placental T. cruzi amastigotes.
There were no differences in menstrual cycle parameters and the number of fetal losses between seropositive and seronegative baboons with history of fetal loss. The amount of parasite DNA detected using quantitative polymerase chain reaction (Q-PCR) in M. fascicularis placenta was within the range detected in infected baboon tissues.
There is no evidence that chronic maternal T. cruzi infection causes fetal loss in baboons. Q-PCR is a useful diagnostic tool to study archived NHP placentas.
Baboon; macaque; placental lesions; reproductive performance; serology; trypanosomiasis
Bone marrow stem cells (BMSCs) are mobilized in response to ischemic attacks, e.g. myocardial infarction, to repair the damage, or by cytokines, e.g. granulocyte colony-stimulating factor (G-CSF), which is used to harvest BMSCs for autologous transplantation. In order to optimize BMSC mobilization strategy for cardiovascular repair, we investigated whether BMSCs mobilized by G-CSF share the same subtype profile as that by ischemia in a nonhuman primate model.
Methods and results
We subjected 5 baboons to subcutaneous G-CSF injection and 5 baboons to femoral artery ligation. Blood BMSCs were measured by surface antigens; functional differentiation to endothelial cells (ECs) was assessed by colony forming capacity, expression of mature EC antigens and tube-like formation. The number of circulating CD34+/CD45RA- cells spiked on day 3 post-stimulation in both groups. While the number of CD34+ cells released by artery ligation was 2-fold lower by comparison with the number released by G-CSF administration, significantly more CD133+/KDR+/CXCR4+/CD31+ cells were detected in the baboons that underwent artery ligation. After culture in endothelial growth medium, mononuclear cells from baboons with artery ligation formed more EC colonies and more capillary-like tubes (p<0.05), expressed higher vWF and phagocytosed more Dil-Ac-LDL (p<0.05).
While G-CSF and artery ligation can mobilize BMSCs capable of differentiating into ECs, BMSCs mobilized by the artery ligation simulating in vivo ischemic attacks have higher potential for vascular differentiation. Our findings demonstrate that different mobilization forces release different sets of BMSCs that may have different capacity for cardiovascular differentiation.
Bone marrow stem cells; nonhuman primate; endothelial progenitor cells
Oncolytic virotherapy for cancer treatment utilizes viruses for selective infection and death of cancer cells without any adverse effect on normal cells. We previously reported that the human respiratory syncytial virus (RSV) is a novel oncolytic virus against androgen-independent PC-3 human prostate cancer cells. The present study extends the result to androgen-dependent prostate cancer, and explores the underlying mechanism that triggers RSV-induced oncolysis of prostate cancer cells.
The oncolytic effect of RSV on androgen-sensitive LNCaP human prostate cancer cells and on androgen-independent RM1 murine prostate cancer cells was studied in vitro in culture and in vivo in a xenograft or allograft tumor model. In vitro, cell viability, infectivity and apoptosis were monitored by MTT assay, viral plaque assay and annexin V staining, respectively. In vivo studies involved virus administration to prostate tumors grown in immune compromised nude mice and in syngeneic immune competent C57BL/6J mice. Anti-tumorogenic oncolytic activity was monitored by measuring tumor volume, imaging bioluminescent tumors in live animals and performing histopathological analysis and TUNEL assay with tumors
We show that RSV imposes a potent oncolytic effect on LNCaP prostate cancer cells. RSV infectivity was markedly higher in LNCaP cells compared to the non-tumorigenic RWPE-1 human prostate cells. The enhanced viral burden led to LNCaP cell apoptosis and growth inhibition of LNCaP xenograft tumors in nude mice. A functional host immune response did not interfere with RSV-induced oncolysis, since growth of xenograft tumors in syngeneic C57BL/6J mice from murine RM1 cells was inhibited upon RSV administration. LNCaP cells failed to activate the type-I interferon (IFNα/β)-induced transcription factor STAT-1, which is required for antiviral gene expression, although these cells could produce IFN in response to RSV infection. The essential role of IFN in restricting infection was further borne out by our finding that neutralizing IFN activity resulted in enhanced RSV infection in non-tumorigenic RWPE-1 prostate cells.
We demonstrated that RSV is potentially a useful therapeutic tool in the treatment of androgen-sensitive and androgen-independent prostate cancer. Moreover, impaired IFN-mediated antiviral response is the likely cause of higher viral burden and resulting oncolysis of androgen-sensitive prostate cancer cells.
Several risk factors are associated with the incidence of human stillbirths. The prevention of stillbirths in women is a pressing clinical problem.
We reviewed 402 pathology records of fetal loss occurring in a large baboon (Papio spp.) colony during a 15-year period. Clinical histories of 565 female baboons with one or more fetal losses during a 20-year period were analyzed for weight, age, and reproductive history.
Fetal loss was most common at term (35.57%) and preterm (28.61%) and less common in the first half of gestation (11.20%) and post-term (5.22%). Greater maternal weight, older age, history of stillbirth and higher parity were independent predictors for stillbirth. An exponential increase in the incidence of fetal loss was observed beginning at age 14 years in baboons.
Fetal loss and maternal risk factors associated with stillbirths in baboons were similar to those documented in women.
fetal loss; reproduction; animal model; epidemiology; non-human primates
The anti-tumor effects of calorie restriction (CR) and the possible underlying mechanisms were investigated using ethylnitrosourea (ENU)-induced glioma in rats. ENU was given transplacentally at gestational day 15, and male offspring were used in this experiment. The brain from 4-, 6-, and 8-month-old rats fed either ad libitum (AL) or calorie-restricted diets (40% restriction of total calories compared to AL rats) was studied. Tumor burden was assessed by comparing the number and size of gliomas present in sections of the brain. Immunohistochemical analysis was used to document lipid peroxidation [4-hydroxy-2-nonenal (HNE) and malondialdehyde (MDA)], protein oxidation (nitrotyrosine), glycation and AGE formation [methylglyoxal (MG) and carboxymethyllysine (CML)], cell proliferation activity [proliferating cell nuclear antigen (PCNA)], cell death [single-stranded DNA (ssDNA)], presence of thioredoxin 1 (Trx1), and presence of heme oxygenase-1 (HO-1) associated with the development of gliomas. The results showed that the number of gliomas did not change with age in the AL groups; however, the average size of the gliomas was significantly larger in the 8-month-old group compared to that of the younger groups. Immunopositivity was observed mainly in tumor cells and reactive astrocytes in all histological types of ENU-induced glioma. Immunopositive areas for HNE, MDA, nitrotyrosine, MG, CML, HO-1, and Trx1 increased with the growth of gliomas. The CR group showed both reduced number and size of gliomas, and tumors exhibited less accumulation of oxidative damage, decreased formation of glycated end products, and a decreased presence of HO-1 and Trx1 compared to the AL group. Furthermore, gliomas of the CR group showed less PCNA positive and more ssDNA positive cells, which are correlated to the retarded growth of tumors. Interestingly, we also discovered that the anti-tumor effects of CR were associated with decreased hypoxia-inducible factor-1α (HIF-1α) levels in normal brain tissue. Our results are very exciting because they not only demonstrate the anti-tumor effects of CR in gliomas, but also indicate the possible underlying mechanisms, i.e. anti-tumor effects of CR observed in this investigation are associated with reduced accumulation of oxidative damage, decreased formation of glycated end products, decreased presence of HO-1 and Trx1, reduced cell proliferation and increased apoptosis, and decreased levels of HIF-1α.
calorie restriction; ethylnitrosourea; glioma; oxidative stress; HIF-1α
Maternal obesity is present in 20–34% of pregnant women and has been associated with both intrauterine growth restriction and large-for-gestational age fetuses. While fetal and placental functions have been extensively studied in the baboon, no data are available on the effect of maternal obesity on placental structure and function in this species. We hypothesize that maternal obesity in the baboon is associated with a maternal inflammatory state and induces structural and functional changes in the placenta. The major findings of this study were 1) decreased placental syncytiotrophoblast amplification factor, intact syncytiotrophoblast endoplasmic reticulum structure and decreased system A placental amino acid transport in obese animals; 2) fetal serum amino acid composition and mononuclear cells (PBMC) transcriptome were different in fetuses from obese compared with non-obese animals 3) maternal obesity in humans and baboons is similar in regard of increased placental and adipose tissue macrophage infiltration, increased CD14 expression in maternal PBMC and maternal hyperleptinemia. In summary, these data demonstrate that in obese baboons in the absence of increased fetal weight, placental and fetal phenotype are consistent with those described for large- for-gestational age human fetuses.
Study of endocrine pathology in animal models is critical to understanding endocrine pathology in humans.
We evaluated 434 endocrine-related diagnoses from 4,619 baboon necropsies, established the incidence of spontaneous endocrine pathology, and analyzed the clinical and biochemical data associated with the individual cases.
The most common diagnoses in descending order, were pancreatic islet cell amyloidosis (n=259), ovarian cysts (n=50), pituitary adenoma (n=37), pancreatic islet cell adenoma (n=20), granulosa cell tumor (n=15), thyroid adenoma (n=11), adrenal hyperplasia (n=10), thyroid carcinoma (n=8), and pheochromocytoma (n=6). The incidence of pancreatic islet cell amyloidosis progressively increased with age. Pheochromocytomas were associated with renal and heart failure. The incidence of pancreatic islet cell amyloidosis and adrenal pathology was similar to humans; the incidence of pituitary adenoma and thyroid pathology was lower than in humans.
Endocrine disease in baboons is common and shares clinical and biochemical characteristics with endocrine disease in humans.
Papio; nonhuman primate; thyroid; pancreas; endocrine; disease; cancer
Marmosets and tamarins are increasingly used in research, but their pathology remains poorly defined compared to old world primates.
Necropsy records of 129 marmosets and 52 tamarins were reviewed; none were used experimentally.
The most common marmoset lesions were dehydration, emaciation, nephritis, colitis and inanition. The most common tamarin lesions were dehydration, ascites, emaciation and congestive heart failure. Colitis and heart disease were the most common cause of death in marmosets and tamarins, respectively. Immature marmoset and tamarin deaths often occurred within the first month of life. Immature marmosets usually died from inanition, stillbirth and colitis; immature tamarins from atelectasis, stillbirth, heart failure and colitis. Lymphoma was the most common neoplasm for both marmosets and tamarins.
The findings were similar to prior reports with differences in frequency and severity. We report the first case of endometriosis in a marmoset.
nonhuman primate; Callitrichidae; disease; epidemiology; cancer
There is little information available concerning trichobezoars in the nonhuman primate literature.
We evaluated 118 cases of trichobezoar in baboons over a 29 year period at the Southwest National Primate Research Center.
The anatomic locations affected in decreasing order were the stomach, small intestine, cecum, esophagus, and colon. The most common clinical history was weight loss. The most frequent associated pathology included gastrointestinal inflammation and ulceration, emaciation, peritonitis, intussusception, pneumonia, and aspiration. Trichobezoars were the cause of death in 9 baboons and the reason for euthanasia in 12. Females were 2.14 times more likely than males to be affected. The greater the percentage of group housing time, the more likely the baboon was to develop trichobezoars.
The baboon may present a useful model to evaluate the etiology, genetic predisposition, physiopathology, neurobiology, and treatment response of trichobezoars.
Stomach; hairball; trichophagia; trichotillomania; hair pulling; nonhuman primate; Papio
As the baboon is a model of primary generalized epilepsy, we were interested in mortality of captive animals with a history of witnessed seizures. Causes of natural death were investigated in 46 seizure baboons (SZ) and 78 nonepileptic controls (CTL), all of which underwent a complete pathological examination at the Southwest Foundation for Biomedical Research (SFBR) in San Antonio. SZ animals died at a younger age than the control baboons (p<0.001). Almost all epileptic baboons that died suddenly without an apparent cause (SZ-UKN), had pulmonary congestion or edema without evidence of trauma, systemic illness or heart disease, compared to 9 (12%) controls (p<0.001), most of which demonstrated evidence of a concurrent illness. Serosanguinous bronchial secretions were found in 15 (58%) SZ-UKN baboons, but only in 3 (4%) controls (p<0.001). Chronic multifocal fibrotic changes in myocardium were noted in only 3 (12%) of SZ-UKN baboons and one control baboon. Based upon these results, untreated seizures appear to reduce the life expectancy of captive baboons. Sudden unexpected death in epilepsy (SUDEP) may be a common cause of natural death in epileptic baboons.
Papio; Baboon; Mortality; Epilepsy; SUDEP
A high incidence of heart disease, especially idiopathic cardiomyopathy, is seen in chimpanzees (Pan troglodytes).
We reviewed clinical records and necropsy reports of 87 adult chimpanzees for possible causes of heart disease/idiopathic cardiomyopathy. We examined age, sex, cause of death, weight, diet, environment, infectious diseases, experimental uses, and clinical pathology.
The overall prevalence of heart disease in chimpanzees was 67.81%; the prevalence of idiopathic cardiomyopathy was 51.72%. The prevalence of idiopathic cardiomyopathy was significantly higher in males (60.32%) than females (29.17%, p=0.009). The prevalence of other heart disease was higher in females (25%) than males (12.70%, p=0.165). Heart failure occurred in 47.13% of chimpanzees. Heart disease was the primary cause of death in 34.49% of chimpanzees; 29.88% died of unknown causes.
We found no evidence that diet, environment, viral agents, experimental use or disease exposure contributed to the deaths resulting from idiopathic cardiomyopathy in chimpanzees.
ape; cardiomyopathy; atherosclerosis; arteriosclerosis; nonhuman primate
Brucellosis is veterinary and human health problem.
A 13-year-old wild caught multiparous and an 8-year-old colony-born nulliparous baboon had stillbirths in the second trimester of pregnancy. Culture isolates from both postpartum uteruses were characterized using traditional biochemical analysis, PCR, and multilocus sequencing.
The isolates morphologically resembled Brucella although their phenotypic characteristics were not consistent with any currently described species. The isolates represent a novel lineage within the genus with unique alleles, not previously seen in surveys of greater than 300 isolates representing the known diversity of the genus, present at 5/9 loci examined.
The described cases are to the best of our knowledge the first presentation of a naturally acquired Brucella infection in non-human primates associated with stillbirths from the same colony where Brucella seropositivity in the baboons was described 45 years ago. The organism appears to represent a previously undescribed Brucella species.
brucella; non-human primates; stillbirth
Squamous cell carcinoma (SCC) is a neoplastic proliferation of epithelial cells undergoing squamous differentiation and represents a diagnostic challenge in nonhuman primates (NHP), especially in baboons with perineal SCC.
Fourteen SCC (13 baboons, 1 spider monkey) were identified over a 20-year period. A literature search identified 86 additional published cases of spontaneous NHP SCC.
SCC was most commonly reported in macaques, baboons, marmosets, and squirrel monkeys. Metastasis occurred in 23%, of NHP. The most frequently reported primary locations were the oral cavity, integument, esophagus, and cervix-uterus. Perineal SCC occurred mainly in baboons. All reported SCC in marmosets occurred in the head. Nasal cavity SCC was only reported in male marmosets. All reported pulmonary SCC occurred in males, mostly in tree shrews.
SCC is a common neoplasm in NHP and exhibits species differences. NHPs may provide a useful SCC animal model.
Cancer; neoplasm; Papio; skin; oral cavity; esophagus
Chagas disease (CD) or American trypanosomiasis is caused by a hemoflagellate protozoan, Trypanosoma cruzi (TC). This organism has been isolated from more than 100 mammalian species and several insect vectors demonstrating a wide host distribution and low host specificity.
A 23 year old male chimpanzee died acutely and a complete necropsy was performed to evaluate gross and microscopic pathologic changes. After observation of trypanosomal amastigotes in the myocardium, PCR and immunohistochemistry was employed to confirm the diagnosis of TC.
Gross findings were consistent with mild congestive heart failure. Microscopic findings included multifocal myocardial necrosis associated with severe lymphocytic to mixed inflammatory infiltrates, edema, and mild chronic interstitial fibrosis. Multifocal intracytoplasmic amastigotes morphologically consistent with TC were observed in cardiac myofibers. TC was confirmed by PCR and immunohistochemistry.
We report, to the best of our knowledge, the first fatal spontaneous case of TC infection in a chimpanzee.
Ape; nonhuman primate; protozoa; fatal case; Trypanosoma cruzi
Endometrial and cervical polyps are masses of endometrium or cervical epithelium that bulge into the uterine or cervical lumen. The physiopathology and contributing factors of endometrial polyps development are still unknown.
Clinical and pathology records of 28 nonhuman primates with histologically confirmed endometrial and cervical polyps were reviewed. Twenty-one baboons with endometrial polyps were evaluated for age at diagnosis; body weight; menstrual cycle length, presence of endometriosis and adenomyosis; and number of offspring, cesarean sections, and stillbirths.
Endometrial polyps in baboons were associated with increased age, decreased menstrual cycle lengths, endometriosis, and decreased parity. No differences were found for weight, adenomyosis, or number of cesarean sections or stillbirths.
Baboons are a promising model for the study of endometrial polyps because of their similarity to humans in both the development of endometrial polyps and association of many of the same risk factors.
endometrium; uterus; mass; cancer; nonhuman primate
Non-specific lymphocytic myocarditis (NLM) is frequently observed in baboons within the endemic range of Trypanosoma cruzi. We sought to determine whether T. cruzi infection is a cause of baboon NLM. We evaluated serial histologic sections of cardiac muscle, blood cultures, immunohistochemistry, serology, polymerase chain reaction, and clinical pathology from 31 baboons with NLM to determine whether T. cruzi infection is associated with NLM. Eleven baboons with no evidence of T. cruzi infection by serology and no NLM were used as controls. Seropositivity for T. cruzi was 45% in baboons with NLM compared with a 2–3% colony prevalence. NLM lesion severity was significantly higher in seropositive than seronegative baboons with NLM. NLM was significantly more common in older baboons. No statistical association between NLM and sex, weight, or clinical pathology was found. These results suggest an association between NLM and T. cruzi infection in the baboon.