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Memórias do Instituto Oswaldo Cruz

Print version ISSN 0074-0276

Mem. Inst. Oswaldo Cruz vol.107 no.8 Rio de Janeiro Dec. 2012

http://dx.doi.org/10.1590/S0074-02762012000800014 

SHORT COMMUNICATIONS

 

Bone tuberculosis in Roman Period Pannonia (western Hungary)

 

 

Tamás HajduI, +; Erzsébet FóthiII; Ivett KőváriIII; Mónika MercziIV; Attila MolnárV; Gábor MaászVI, VII; Péter AvarVI; Antónia MarcsikVIII, László MárkVI, VII

IDepartment of Biological Anthropology, Institute of Biology, Faculty of Science, Eötvös Loránd University, Budapest, Hungary
IIDepartment of Anthropology, Hungarian Natural History Museum, Budapest, Hungary
IIIDepartment of Archaeology, Herman Ottó Museum, Miskolc, Hungary
IVDepartment of Archaeology, Balassa Bálint Museum, Esztergom, Hungary
VDepartment of Archaeology, Xántus János Museum, Gy
őr, Hungary
VIDepartment of Analytical Biochemistry, Institute of Biochemistry and Medical Chemistry, Medical School, University of Pécs, Pécs, Hungary
VIIJános Szentágothai Research Centre, University of Pécs, Pécs, Hungary
VIIIIndependent consultant

 

 


ABSTRACT

The purpose of this study was to analyse a skeleton (adult female, 25-30 years) that presented evidence of tuberculous spondylitis. The skeleton, dated from the Roman Period (III-VI centuries), was excavated near the town of Győr, in western Hungary. The skeleton was examined by gross observation supplemented with mycolic acid and proteomic analyses using MALDI-TOF/TOF tandem mass spectrometry. The biomolecular analyses supported the morphological diagnosis.

Key words: spinal tuberculosis - mycolic acid analysis - proteomic analysis


 

 

Paleopathology is an important branch of physical anthropology, it involves the study of injuries and disease processes in ancient human populations. Infectious diseases are the most significant selective factors affecting human populations and they cause the most important pathological processes resulting in changes in bones. Specific bacterial causes of disease are associated with characteristic bone lesions that do not occur with infection caused by other bacterias. Examples of such infections include tuberculosis (TB), treponematosis and leprosy (Manchester 1983).

Estimating the exact prevalence of skeletal TB in ancient populations is very difficult. Approximately 5% of chronic TB cases show typical lesions in the skeleton (Donoghue et al. 2004). Moreover, the results of the examination of a skeleton can be influenced by post-mortem damage to the skeletal remains resulting from burial. This paper presents the investigation of a skeleton that displayed changes suggestive of tuberculous spondylitis.

In 2009, three skeletons from the Roman Period (second half of the III-IV centuries) were excavated in Győr, in western Hungary (Győr-Frigyes Laktanya site). These skeletons were found at a smaller settlement located near Arrabona, along the trade route between Arrabona and Savaria, another Roman settlement. Arrabona was built on the site of a modern-day town and an earlier Celtic settlement and it was one of the most important auxiliary Roman forts of the Danube Limes (Gabler 1967, Visy 2003a, b). The skeletal materials were kept in the Xántus János Museum in Győr. Morphological sex was determined and the age at death was estimated by the recommendations of Rösing et al. (2007). The paleopathological analysis was conducted by gross observation (Ortner 2003).

Of the three specimens, one (KE69, male, 35-50 years old) showed no pathological changes in the skull or postcranial bones. Another (KE90, female, 25-35 years old) had no pathological lesions in the skull, but had non-specific changes in the bones of the lower limbs. This skeleton showed slight periostitis on the medial surface of the left tibia and osteomyelitis in the right tibia, at the nutrient foramen.

The third specimen (KE91), a complete skeleton of a 25-30-year-old female, had severe and distinctive lesions. The skeleton was well preserved and all the bones could be examined. Changes indicative of spinal TB were limited to certain sections of the spine, such as the thoracic region. The anterior and lateral surfaces of all the vertebral bones showed slight hypervascularisation and porosity was noted on these surfaces as well as on the upper and lower intervertebral plates. The porosity and hypervascularisation were more pronounced in the thoracic and lumbar vertebrae. Hypertrophic bone formation was observed in the second and third thoracic vertebrae (T2-T3) and marginal lipping, porosity and bone reaction were observed in the T4-T5 vertebral bodies. The most characteristic pathological changes were seen in the third and fourth thoracic vertebrae (Figs 1, 2). Reactive bone formation was also observed, as well as a large lytic focus in the vertebral bodies (Figs 3-6). The affected section of the spinal column showed no evidence of marked collapse or gibbous deformity and only a slight angulation was observed. The neural arches of the third and fourth thoracic vertebrae were not affected. Osteolytic changes and periosteal reaction in these thoracic vertebrae suggest an active-stage infectious process, most likely of tuberculous aetiology. Other pathological lesions included slight hypervascularisation on anterior and posterior surfaces of the sternum and periostitis on the femora, tibiae and fibulae. These changes may be associated with TB. Other observed lesions, including degenerative arthritis in the shoulder joints, incomplete spondylolysis in the fifth lumbar vertebra and a healed oblique fracture of the distal left ulnar shaft, are not associated with TB. There were no pathological lesions on the endocranial and ectocranial surfaces of the skull or on the ribs.

 

 

 

 

 

 

 

 

 

 

 

 

Regarding the morphological changes in the spine that were suggestive of tuberculous spondylitis, several differential diagnoses could be considered: fracture, osteoporosis, brucellosis, metastatic cancer, staphylococcal infection or osteomyelitis. To clarify the exact aetiology of the skeletal changes, biomolecular analysis was performed on skeletal samples from the KE69, KE90 and KE 91 specimens.

Samples of ancient mycolic acids and Mycobacterium tuberculosis specific proteins were investigated by mass spectrometry to provide additional molecular evidence of mycobacterial infection. The sample preparation and mass spectrometric analysis of lipid and protein biomarkers were conducted as previously described (Márk et al. 2010, 2011, Boros-Major et al. 2011). Briefly, 65 mg of crude bone powder was decalcified with 1 mL of 0.5 M ethylenediamine tetraacetic acid (pH = 8.0) and extracted with 100 µL of 6 M guanidine-HCl in 0.1 M Tris (pH = 7.5) at room temperature. The extracted proteins were separated by sodium dodecyl sulfate polyacrylamide gel electrophoresis and in-gel enzymatic hydrolysis of the proteins of interest was achieved using a trypsin solution. Proteomic analysis was conducted using peptide mass fingerprinting and direct sequencing of single charged monoisotopic peaks of the tryptic peptides. Mycolic acids and their derivatives were extracted from 100 mg of bone powder with 200 µL chloroform-methanol (80/20 v/v) mixture in an ultrasonic bath with an extraction time of 10 min. A mixture of 3 µL of extract or control standard solution with an equal volume of a 2.5-dihydroxybenzoic acid matrix solution was loaded onto the target plate (MTP 384 massive target T, Bruker Daltonics, Bremen, Germany). Several peptide fragments of mycobacterial proteins, including a fumarate reductase flavoprotein subunit (gi:15608690) and adenylate kinase (gi:15607873), were identified from the bone samples. The results of the proteomic analysis to identify mycobacterial proteins are summarised in Table. Specific mycobacterial lipid biomarkers were detected by MALDI-TOF/TOF MS in the KE91 sample, providing further support for the hypothesis of a tuberculous aetiology. In our extracts, both positively charged monoisotopic peaks of free mycolic acids (Figs 7, 8) and fragments of trehalose mycolates were observed (Figs 9, 10) (Shui et al. 2007). Our mass spectrometry results showed significant M. tuberculosis infection in the investigated skeletal remains. The KE69 and KE90 samples tested negative for the presence of M. tuberculosis (Fig. 7).

 

 

Many cases of osseous TB have been discovered in different regions of Europe. Published cases suggest that TB was widespread in Europe in the VII-VIII centuries and XIV-XVII centuries (Pálfi et al. 1999, Roberts & Buikstra 2003, Stone et al. 2009).

The elevated frequency of skeletal TB in the ancient populations of Hungary (predominantly on the Great Plain of eastern Hungary) has been a focus of investigation for years. These cases are primarily from the VII-IX centuries AD (Avar period) and later (Pálfi & Marcsik 1999, Marcsik et al. 2006). A case of hypertrophic osteoarthropathy consistent with TB has been described in a Late Neolithic (4790-4594 BC) population (Masson et al. 2008). Another specimen, from the Late Neolithic Period (5th millennium BC), was reported to have signs of Pott's disease (Köhler et al. 2012). To date, there has been only one case of spinal TB (lumbosacral TB) dating from the II-V centuries (Sarmatian Period) (Szelekovszky & Marcsik 2010). Cases of skeletal TB have also been reported in western Hungary (Transdanubia), including the earliest reported case, from the Roman Period (340-430 AD) (Merczi 2001) and later cases (IX-XII centuries) (Évinger et al. 2011). Spinal TB has been observed in mummified individuals and in excavated dry skeletons from the XVIII-XIX centuries (Pap et al. 1999, Fletcher et al. 2003a, b, Szikossy et al. 2010).

Although there is little published evidence of TB in Hungary before the Roman Period, skeletal TB may have been present in Hungary at that time. During the Roman Period, urbanisation and an increase in public utilities, new living conditions and an increased population density in Hungary and throughout the Roman Empire may have led to the dissemination of infectious diseases including TB (Nagy 2003). Based on this process of urbanisation, one might presume that skeletons with TB would be discovered with greater frequency in the osteoarcheological findings of excavations of Roman-Period cemeteries in western Hungary. However, paleopathological investigations of such materials have not yet been performed. This case of skeletal remains with evidence of spinal TB (presumed morphologically and confirmed by biomolecular analyses) contributes to available knowledge of the health of Roman-Period populations and the morphological aspects of bone TB. Our results show that biomolecular investigations are of vital importance for precise diagnosis and should be included as routine procedures in paleopathological investigations (Taylor et al. 1996, Zink et al. 2001, Fletcher et al. 2003a, b, Donoghue et al. 2005, Hershkovitz et al. 2008, Évinger et al. 2011, Hajdu et al. 2012).

 

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Received 13 January 2012
Accepted 10 September 2012
Financial support: Faculty of Medicine Research Fund (AOK-KA 34039-11/2009, AOK-KA 2011), University of Pécs, the Hungarian National Scientific Research Foundation (OTKA K72592, D048294, CNK 78480), TIOP 1.3.1-10/1-2010-0008, TIOP 1.3.1-07/1

 

 

+ Corresponding author: hajdut@elte.hu

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