J Arthropod-Borne Dis, September 2019, 13(3): 334–343 B Pourmohammadi and S Mohammadi-Azni: Molecular … 334 http://jad.tums.ac.ir Published Online: September 30, 2019 Short Communication Molecular Detection of Leishmania major in Hemiechinus auritus, A Potential Reservoir of Zoonotic Cutaneous Leishmaniasis in Damghan, Iran *Behrad Pourmohammadi1, 2; Sadegh Mohammadi-Azni3 1Department of Parasitology, School of Medicine, Semnan University of Medical Sciences, Semnan, Iran 2Department of Health Education and Promotion, School of Health, Semnan University of Medical Sciences, Semnan, Iran 3Damghan Health Center, Semnan University of Medical Sciences, Semnan, Iran (Received 1 Jan 2018; accepted 9 Jul 2019) Abstract Background: Zoonotic cutaneous leishmaniasis caused by Leishmania major is endemic in 17 of 31 Iranian provinces. Various species of rodents have been introduced as the main reservoirs of the disease. This study was conducted to de- termine the natural infection of hedgehogs with Leishmania spp. in an endemic area of the disease, northern Iran. Methods: Fifteen long-eared hedgehogs were captured alive during 18 months study period, from Apr 2015 to Sep 2016, in Damghan City, Semnan Province, Iran. The animals were identified using apparent characteristics and to determine the Leishmania infection, impression smears were prepared from their ear lobes, hind feet, livers, and spleens. Micro- scopic examination and semi-nested PCR were applied to determine the infection and to identify the parasites species respectively. Results: All examined animals were identified as Hemiechinus auritus (Family: Erinaceidae). In microscopic examination, 8 (53.3%) samples were shown to be infected with Leishmania parasites. The higher and lower rate of the infection was observed in the ears as well as the feet and in the liver specimens, 53.3%, and 33.3% respectively. Forty percent (6/ 15) of the samples were molecularly positive and all were identified as L. major parasites. All the examined animals in au- tumn and 50% of them in summer were shown to be infected with Leishmania parasites. Conclusion: This study demonstrated the natural infection of H. auritus with L. major for the first time in Damghan City and introduced these mammals as new potential reservoirs of ZCL in the study area. Keywords: Hemiechinus auritus; Potential reservoir; Leishmania major; Semi-nested PCR; Iran Introduction Leishmanioses, a significant group of pro- tozoan parasitic diseases caused by around 20 of 30 obligate intracellular parasite species of genus Leishmania in humans, are endemic and occur in more than 100 countries of four con- tinents of the world including; Asia, Africa, Eu- rope, and America. The disease represents four types of clinical manifestations from the self- healing cutaneous to the life-threatening, vis- ceral form, if untreated (1-3). So far, more than 50 species of genus Leishmania have been iden- tified, of which 31 species can infect mammals and 20 species can cause the various types of leishmaniasis in humans with either zoonotic or anthroponotic origins (1, 4). No more than 70 species of approximately 900 sand fly species have been implicated in the transmission of Leishmaniasis (5). Leishmaniasis is still one of the most ne- glected diseases in the world which affecting largely the poorest of the poor, mainly in devel- oping countries (3). Overall, 350 million people are at risk of all types of disease and an estimat- ed 1.6 million cases occur annually all over the world. There is also an estimation of 0.2–0.4 million cases of Visceral Leishmaniasis (VL) and 0.7–1.2 million cases of cutaneous leishman- iasis (CL) in the endemic areas of the world (6). Cutaneous leishmaniasis is an endemic dis- ease in 88 countries worldwide (7). Approxi- *Corresponding author: Dr Behrad Pourmoham- madi, E-mail: behrad89@gmail.com http://jad.tums.ac.ir/ J Arthropod-Borne Dis, September 2019, 13(3): 334–343 B Pourmohammadi and S Mohammadi-Azni: Molecular … 335 http://jad.tums.ac.ir Published Online: September 30, 2019 mately, 90% of CL cases have been reported from Iran, Algeria, Afghanistan, Saudi Arabia, Syria, Brazil and Peru (8). Iran is one of the ten countries that around 70–75% of new CL cases occur in it (6). Cutaneous leishmaniasis (CL), is one of the two clinical forms of the disease in Iran, is more prevalent with a prevalence rate of 1.8–37.9% and around 30000 new cases annually (9). Glob- ally, it is estimated to be the ninth cause of hu- man infectious diseases' burden (10). The zoon- otic form of the disease (ZCL) due to L. major is the most prevalent type of the CL mainly in rural areas of 17 out of 31 provinces of the coun- try (11, 12). According to the geographical dis- tribution and various types of reservoirs and vec- tors of ZCL, three epidemiological types of the disease have been classified in Iran (13). Various species of rodents including Rhom- bomys opimus, Nesokia indica, Meriones liby- cus, Tatera indica, M. hurrianae, Rattus norvegi- cus, M. persicus, and Mus musculus have been identified as reservoir and or potential reser- voir hosts of the parasite in the country (11, 14-19). Furthermore, the parasite species have recently been isolated and reported in gorillas (20) and hedgehogs in several parts of the world (21-24). Phlebotomus papatasi, the most preva- lent species of Phlebotomus genus, is the pre- dominant and the only proven vector of ZCL (13, 25). Hedgehogs are distributed in various parts of Iran. These mammals are found in the wild and in a lower amount of pet animals. Despite wide distribution in Iran, these animal species have not been studied enough about their par- asites (26). Hedgehogs are omnivorous. They feed mostly on invertebrates such as slugs, bee- tles, caterpillars, earthworms, and some other in- sects. Furthermore, grass snakes, frogs, vipers, fish, young birds, birds′ eggs and small rodents can be fed by those small mammals (27). The long-eared hedgehog lives in burrows that it makes or finds. It is recognized by its long ears. They inhabit a few various types of dry steppes, deserts and semi-deserts. They often inhabit in oasis and around human settlements. The long-eared hedgehogs live in burrows that they dig under bushes with a length of 45cm long with one opening. They may live in aban- doned burrows of other small mammals. They are nocturnal solitary hedgehogs. During the day, they are found resting under rocks, hollows or rock piles (28). In a study to determine the reservoirs and vectors of Leishmania parasites in Damghan City, an endemic focus of ZCL in Iran, we ac- cidentally encountered with a hedgehog cap- tured in wire live trap set out for rodents in the southern part of the city, where the rodents in- fection with L. major parasites have been prov- en more recently (11). The existence of some recent reports about the infection of the hedge- hogs with Leishmania parasites in other parts of the world drew our interest in assessing Leish- mania spp. in these animals. Therefore, the present study was conduct- ed to investigate the possible leishmania in- fection of these small mammals in the city in an eighteen month period, from Apr 2015 to Sep 2016. Materials and Methods Study area and period The present study was carried out during 4 Apr 2015 to 22 Sep 2016 in Damghan, a well- known endemic region of ZCL in Iran. Zoon- otic Cutaneous Leishmaniasis have been report- ed in an epidemic form in Damghan district (at about 36°10′ N, 54°20ʹ E) with around 1000 cases in 1999. Since 1999 until now the disease re- mains in endemic form with around 100 cases every year (29, 30). Damghan is a city situated between Semnan and Shahroud cities of Sem- nan Province with an altitude of 1170m and arid climate. The temperature and annual rainfall av- erages of the city are about 16.3 °C and 120mm respectively. The city is bounded on the plain areas in the south with 23.5 °C and the moun- tainous areas in the north with 9.8 °C average http://jad.tums.ac.ir/ J Arthropod-Borne Dis, September 2019, 13(3): 334–343 B Pourmohammadi and S Mohammadi-Azni: Molecular … 336 http://jad.tums.ac.ir Published Online: September 30, 2019 temperature. However, it is classified as a de- sert region with an arid climate (31, 32). Animal capturing The first animal was captured in a wire live trap (Sherman) laid at the entrance of the rodent burrow in farmland of wheat close to houses (Fig. 1) and the rest of the animals were found in their daily resorts, holes in the old brick walls, and were caught by hand. The captured animals were put in a carton and were transferred to the laboratory. The ethical code (IR.SEMUMS.REC.1397. 136) was obtained from the Ethics Committee of Semnan University of Medical Sciences. Measurements and sampling After transferring to the laboratory and tak- ing photographs, the animals were slightly anes- thetized using chloroform for recording the ap- parent characteristics; sex, probable ulcers in each part of the body, and external measures of the ear, the hind foot, the head, the body and the tail of each animal. Impression smears were made from the hindfoot and the ear lobe on clean glass slides. Then, the sampling of spleen and liver were done after euthanizing the animals fol- lowing deep anesthesia and autopsy. The ani- mals were identified according to morpholog- ic characteristics and using valid identification key (33). Microscopic investigation All in absolute methanol fixed smears were stained using 5% Giemsa stain for 25min and were carefully examined under a light micro- scope at 1000× magnification. At least two slides of each sampled organs (ear lobe, hind foot, spleen, and liver) were checked to make the fi- nal decision about parasitological results. Molecular identification For parasite species identification, the ears and feet smears of all fifteen samples were checked by a sensitive molecular technique, Semi-nested PCR assay. DNA extraction The dry Giemsa-stained smears of the ears and feet of each animal were scratched off the slides using lysis buffer and Leishmania para- sites total DNA was extracted by the YTA Genomic DNA Extraction Mini Kit (YEKTA Tajhiz Azma, Iran) following the manufactur- er's training. Semi-Nested PCR amplification The Semi-Nested PCR was performed, as formerly described and applied by other re- searchers (34-36), for detection of Kinetoplast DNA (kDNA) of L. major in the specimens pre- pared from ear lobes and hind feet of the hedge- hogs. The applied primers were the forward LINR4 (5′- GGG GTT GGT GTA AAA TAG GG-3′), the first-round reverse LIN17 (5′- TTT GAA CGG GAT TTC TG-3′), and the second- round reverse LIN19 (5'-CAG AAC GCC CCT ACC CG-3'). In the first-round amplification re- action totally 10μl mixture containing 1μM 10X Buffer, 200μM of each dNTP, 1.5mM MgCI2, 1μM primer LINR4, 0.2μM primer LIN17, 1 unit Taq polymerase (CinnaGen, Tehran, Iran) and 1.5μl of target kDNA from each hedgehog’s specimens were prepared. The mixture was over- laid with mineral oil and then incubated in a CG1-96 thermocycler (Corbett Research, Syd- ney, Australia) at 94 °C for 5min succeeded by 17 cycles, each consisting of 30sec at 94 °C, 30 sec at 52 °C and 30sec at 72 °C. After the last cycle, the extension was continued for a further 10min then held at 4 °C. The second-round am- plification was accomplished following the ad- dition of 90μl of buffer comprising MgCl2, dNTPs and Taq polymerase, as described for the first round, and primer LINl9 (final concentra- tion 1μM) for 33 cycles (94 °C for 30sec, 58 °C for 30sec and 72 °C for 1min). kDNA of refer- ence strain of L. major (MHOM/IR/54/LV39) and distilled water were used as positive and neg- ative controls respectively. 15μl of each PCR products were resolved in 5μl loading buffer and then electrophoresed in a 1.5% agarose gel in TBE buffer containing 0.75% ethidium bromide and visualized under ultraviolet transilluminator. http://jad.tums.ac.ir/ J Arthropod-Borne Dis, September 2019, 13(3): 334–343 B Pourmohammadi and S Mohammadi-Azni: Molecular … 337 http://jad.tums.ac.ir Published Online: September 30, 2019 Leishmania parasites were identified by com- parison of PCR products of specimens with the reference strains and molecular weight markers. Results Animal measurements and descriptions During an 18-month period of the study, 4 Apr 2015 to 22 Sep 2016, 15 (8 male and 7 female) porcupines were caught from differ- ent locations in the city. The samples were caught in three seasons of the year. Ten of 15 examined animals were captured in the sum- mer. None of the animals were caught in win- ter. All animals were morphologically identi- fied as long-eared hedgehog, Hemiechinus auritus (Gmelin, 1770) belong into Family; Er- inaceidae (33). The animals' dorsal spines were white on the peak with darker banding inferi- or. They had a light-colored underside along with long and highly visible ears (length, 41– 49mm) on the head with whitish hairs on the tips of them. The tops and heels of their feet (hind feet length, 37–45mm) were covered with hair but the soles were bare (Fig. 2). The length of the heads, the bodies, the tails and the ears were 50–65mm, 205–230mm, 21–26mm and 41–50 mm respectively (Table 1). None of the animals had any skin ulcers. Microscopic and molecular investigation In the microscopic examination of the prepared smears from four organs (ear lobes, hind feet, liver, and spleen) of each 15 ani- mals, eight (53.3%) of samples were shown to be infected with Leishmania parasites. The higher rates of infection were seen in the samples of ears the same as feet with 53.3% for each. The lower rates of infections (33.3%) were observed in liver specimens (Table 1). All the captured and the examined animals in autumn (3/3, 100%) and 50% (5/10) of the examined animals in summer were shown to be infected with Leishmania parasites. In the molecular assay, six of the specimens (40%) were identified as L. major with sharp bands (Fig. 3). Two of the parasi- tological positive samples were negative in the molecular assay. Table 1. Morphologic characteristics, measurements, parasitological and molecular results of the hedgehogs captured from Damghan City, Semnan Province, Iran, 2015 to 2016 Animals G CD Measurements (mm) Parasitological result Molecular result H F B T E E L S F H1 F 22 May 2015 63 44 225 24 47 + + - + L. major H2 M 28 May 2015 59 43 213 24 49 + - + + - H3 M 25 Jun 2015 65 45 222 25 50 - - - - - H4 F 3 Jul 2015 64 41 230 26 45 - - - - - H5 M 4 Sep 2015 51 40 212 23 41 + - + + L. major H6 F 14 Sep 2015 50 38 205 21 46 + + + + L. major H7 M 27 Sep 2015 62 42 225 25 45 - - - - - H8 M 1 Nov 2015 53 40 215 23 43 - - - - - H9 F 3 Dec 2015 53 37 210 23 42 + + + + L. major H10 F 1 Jul 2016 60 42 224 24 44 - - - - - H11 M 8 Jul 2016 52 41 215 22 42 + - + + - H12 M 22 Jul 2016 54 39 217 23 43 - - - - L. major H13 F 5 Aug 2016 62 41 224 25 47 - - - - - H14 M 19 Aug 2016 57 42 218 24 48 + + - + - H15 F 9 Sep 2016 61 43 225 25 50 + + + + L. major Total 15 8 5 6 8 6 (40%) 8 (53.3%) Abbreviations: G= Gender, CD= Capture Date, H= Head, F= Foot, B= Body, T= Tail, E= Ear, L= Liver, S= Spleen http://jad.tums.ac.ir/ J Arthropod-Borne Dis, September 2019, 13(3): 334–343 B Pourmohammadi and S Mohammadi-Azni: Molecular … 338 http://jad.tums.ac.ir Published Online: September 30, 2019 Fig. 1. The hedgehog captured in wire trap set up at rodent’s burrow entrance and the animal found in a resort in the radix of an ancient wall surrounding the city Fig. 2. The examined hedgehogs in dorsal and ven- trolateral view Fig. 3. The PCR-based productsʹ gel electrophoresis of the samples prepared from the Hemiechinus auritus samples captured from Damghan City. The bands cor- respond to Reference strain of Leishmania major (Lane 1), Hind feet smears (Lanes 2 and 5), Ear lobes sam- ples (Lanes 6, 7 and 8), Ladder marker (Lane 4) and Negative control (Lane 3) Discussion Four species of hedgehogs including H. au- ritus (Long-eared hedgehog), P. hypomelas (Brandtʹs hedgehog), P. aethiopicus (Desert hedgehog), and E. concolar (European hedge- hog) have been identified and reported in dif- ferent parts of Iran (26, 37, 38). All the captured animals in the present study were belonging to Hemiechinus auritus (Long- eared hedgehog). These spiny-coated small mam- mals are widely distributed throughout the coun- try particularly in provinces surrounding the studied area, Damghan City, Semnan Province. They have been reported from Kurdistan, Khuzestan, Golestan, Khorasan, Qazvin, Teh- ran, Sistan and Baluchistan and some other Ira- nian provinces (37, 38). The long-eared hedge- hogs like better to stay in middle climates, avoid- ing the hot desert and the colder mountain areas. Moreover, these species of animals prefer mod- erate areas with average rainfall of 100–400mm. Regarding arid climate of Damghan City, with an average of 120mm annual rainfall, these species of mammals seem to be well adopted in the study region. However, environmental mod- ifications induced by humans can lead to the im- http://jad.tums.ac.ir/ J Arthropod-Borne Dis, September 2019, 13(3): 334–343 B Pourmohammadi and S Mohammadi-Azni: Molecular … 339 http://jad.tums.ac.ir Published Online: September 30, 2019 migration of some wild animals such as hedge- hogs from their common geographical zones to humansʹ inhabited areas and subsequently be- ing infected with new pathogens in new habitat (39). Similar modifications increasingly occur recently in the study area. Leishmania parasites were observed in 53.3 % (8/15) of the examined animals. In microscop- ic positive samples, the parasites were seen in at least three of five examined organs. All the infected animals were positive for Leishmania species in ear lobes and hind feet smears. Us- ing the Semi-Nested PCR method, 40% (6/15) of the samples were identified as L. major. Mo- lecular methods have already been used as use- ful and sensitive methods for identifying Leish- mania parasites in potential reservoir hosts with- out the need to parasites isolation and culture (40). Leishmania major parasite has also been identified and reported in one of the three (33.3 %) examined H. auritus from Turkmen Sahra, Golestan Province, a northern neighboring of the Semnan Province, using molecular and con- ventional methods (21). Natural infection of hedgehogs with Leishmania parasites have also been demonstrated in some other countries of the world such as Tunisia and an endemic area of ZCL in Algeria. The examined hedgehogs have been identified as Atelerix algirus, infected with L. major and L. infantum, in Tunisia and both Paraechinus aethiopicus and Atelerix al- girus, infected with L. major, in Algeria (23, 24). Moreover, Leishmania DNA has been de- tected in the hair of another species of hedgehog, Erinaceus europaneus, in Spain (22). These find- ings have been suggested that hedgehogs com- prise potential reservoir hosts for Leishmania parasites. The parasite species were not identified in two of the eight microscopic positive samples with applied specific primers. A similar result has been found in a survey among rodents, main reservoir hosts of ZCL in the study area (11). However, some Leishmania species other than L. major may exist and circulate between sand fly vectors and animal reservoirs in the region. Leishmania gerbilli and L. turanica have already been reported in rodents from the other endemic areas of Iran (41, 42). In the present study, all the hedgehogs were caught during three seasons; spring, summer, and autumn. The most examined animals (10/15) were caught in the summer. Five of ten (50%) animals caught in summer and all captured in autumn were shown to be infected with Leish- mania parasites. Any animal was observed and caught in winter, possibly due to the cold weath- er and the animals’ hibernation state. The long- eared hedgehog spends the daytime in a burrow and may hibernate for up to 3.5 months over winter. In warmer areas, there is no extended winter hibernation but during periods of food scarcity, there may be aestivation (43). Leish- mania species were observed and identified in the samples obtained from the hedgehogs cap- tured in each three above mentioned seasons of the year, from May to December. The activ- ity period of the main vector of ZCL, Phleboto- mus papatasi, in Iran has been reported from early Apr to mid-Oct (44). In Damghan district, two peaks of activity, in Jun and Sep, have been reported for sand flies, but most of the sand fly infection has been occurred in Sep (29). Regard- ing the Leishmania infection of two examined animals (H1 and H2) captured in May, the ani- mals were probably infected in the last peaks of sand flies activity and they have acted as the "maintenance hosts" of Leishmania parasites in the region. The nests of captured animals were quite close to the rodents barrows. This condition could prepare a good chance of being bitten the hedgehogs by infected sand flies in resting and activity place of the animals. The presence of rodents (Nesokia indica) and sand flies in- fected with L. major have been demonstrated in the studied locations (11). None of the examined mammals were shown to have any apparent skin lesions. Other studies on hedgehogs (23) and rodents as reservoir hosts of Leishmania species have shown similar re- sults in a different focus of ZCL. Leishmania http://jad.tums.ac.ir/ J Arthropod-Borne Dis, September 2019, 13(3): 334–343 B Pourmohammadi and S Mohammadi-Azni: Molecular … 340 http://jad.tums.ac.ir Published Online: September 30, 2019 major may create no or just slight skin lesions in rodents. Therefore, it is not always simple to recognize the Leishmania infection in wild an- imal reservoirs such as rodents (11, 17). Regarding the infection of the H. auritus with L. major parasites in three studied seasons (late spring to late autumn), they can be incriminated as potential reservoir hosts of the Leishmania spp. particularly in endemic areas of ZCL. More- over, they can be considered as a “maintenance hosts” or even “amplifier hosts”. The “mainte- nance hosts” were defined as mammals infect- ed and maintain the infection and the “amplifier hosts” were defined as the mammals that can dis- play a characteristic that favors transmission the infection in addition to maintaining it (45). There- fore, to confirm these characteristics, more field and also experimental studies are needed in the study area. Conclusion The present study demonstrated the natural infection of H. auritus with L. major parasites for the first time in Damghan City, an endem- ic area of ZCL in Iran. Close contact between infected rodents mainly Nesokia indica, hedge- hogs, sensitive human population and also the presence of suitable sand fly vectors, principally Phlebotomus papatasi, can lead to easily expo- sure of H. auritus, a potential reservoir of ZCL, in the transmission cycle of the disease in the studied area. Besides performing the fighting programs against rodents as the main reservoir hosts of the disease in endemic areas of ZCL, infection of other susceptible mammals with Leishmania parasites and possibly reservoir al- teration must be seriously paid attention. 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