Treatment of Acute Cutaneous Leishmaniasis by Oral Zinc Sulfate and Oral Ketocanazole Singly and in Combination ()
Received 3 May 2016; accepted 3 June 2016; published 6 June 2016
1. Introduction
Cutaneous Leishmaniasis (CL) is caused by different species of Leishmania with specific inclination of each species to a particular geographical region. It is endemic in 88 countries including Iraq, Iran, Brazil, Afghanistan, Peru, Sudan and Syria. It has afflicted 12 million people with 1 - 1.5 million new cases each year, putting 350 million people at risk. It is becoming a global problem with increasing incidence due to immigration and travel [1] . Hyperendemicity of leishmaniasis in Iraq has made it an important health problem and demanding high annual expenses when it is running in an epidemic state. Although cutaneous leishmaniasis is a self-limiting disease, its healing takes months to years and in some cases it becomes chronic. On the other hand, healing is associated with a deformed ugly scar [2] . Despite multiple treatment suggestions for cutaneous leishmaniasis, pentavalent antimony compounds are used as first-line treatment [3] ; however, due to their serious potential side effects including cardiac, hepatic and blood toxicity, pancreatitis, increased cases of clinical response failure [4] , high prices, lack of production technology in many of the developing endemic countries and prolonged treatment period, and the emergence of new species. There are strong efforts for finding an effective treatment with less side effects and more acceptable for patients. In many studies, oral zinc sulfate has been reported to be effective in the treatment of cutaneous leishmaniasis and Sharquie et al. was the first researcher that has confirmed its effectiveness in acute and chronic Leishmania [5] - [7] and this study was followed by others like Firooz A. et al. [8] . Ketoconazole is a well known antifungal drug that was tried during the 1980s with limited success [9] . So the aim of the present work is to compare the use oral zinc sulfate and oral ketoconazole in the treatment of acute cutaneous leishmaniasis singly and in combination.
2. Patients and Methods
This case controlled, single, blinded, therapeutic study was conducted in the Department of Dermatology and Venereology, Baghdad Teaching Hospital, Medical City, Baghdad, Iraq from January 2015 to July 2015. A total of 75 patients with acute CL were enrolled in this study. A history was taken from each patient regarding the followings: age, gender, address, duration of the lesions and their number, recurrence of the lesion, history of previous therapy, also family history, past medical history, obstetric history regarding the female in reproductive period and past drug history. Formal consent was taken from each patient before starting the therapy. Also, the ethical approval for this study was given by the scientific committee of the Scientific Council of Dermatology and Venereology-Iraqi Board for Medical Specializations.
Close physical examination was performed including site, size and type of the lesion; and regional lymphadenopathy. Patients with the following criteria were excluded from this study: pregnancy, lactating, chronic diseases like diabetes mellitus [10] , patients who received anti-leishmanial treatment either local or systemic.
2.1. Therapeutic Groups
Patients were divided into three groups:
(A) Zinc sulfate group: lesions were treated with oral zincsulfate in a dose of 10 mg/kg. Zincsulfate powder (heptahydrate purified) ZnSO4∙7H2O, M.W.287.54, purchased from THOMAS BAKER Company, India), is made into capsules together with glucose (BDH) as an excipient. The daily dose was calculated according to the body weight, and divided into three equal doses. Patients were instructed to take one capsule every eight hours preferably on an empty stomach. In case of young children, the parents were instructed to open the capsule and dissolve the contents in water.
(B) Ketoconazole group: lesions were treated with oralketoconazole tablet 200 mg twice daily purchased from Pharma International Company, Jordan. At baseline, laboratory tests were obtained including Serum Gamma- Glutamyltransferase (SGGT), Alkaline Phosphatase, ALT, AST, Total Bilirubin (TBL), Prothrombin Time (PT), International Normalization Ratio (INR), and viral hepatitis serology. In children, the dose was 3 mg/kg.
(C) Combination group: the third group of patients received a combination of oral zinc sulfate capsule in a dose of 10 mg/kg and ketoconazole tablet 200 mg twice daily. In addition, SGGT, alkaline phosphatase, ALT, AST, TBL, PT, INR, and viral hepatitis serology were performed.
2.2. Assessment of Cure Rate
Each lesion in the three groups was assessed through detecting the erythema and its diameter. Measuring the diameter of each lesion was carried out by palpation and marking the induration and measuring its diameter with a caliber in cm unit for rounded regular lesions, whereas for irregular lesions the two maximum diameters (length and width) were taken in order to calculate the mean and in ulcerative lesion, the diameter of ulcer was measured, then Sharquie’s modified leishmania score (Table 1) was used to assess the response to therapy. Patients in all three groups were assessed every 2 weeks for 6 weeks and on each visit the lesion parameters were re-assessed to record the degree of the response and to do scoring and to record any local and systemic side effects. Photos were taken for lesions in the same place, fixed illumination and distance using SONY® Cybershop camera W120 super steady 7.5Megapexiel.
Statistical analysis was done using IBM SPSS Statistics version 20. Data will be presented in mean ± S.D. Statistically significant differences (P < 0.05) will be calculated between therapeutic groups by Student t test, ANOVA, TUKEY HSD, and Scheffe.
3. Results
A total of 75 patients with acute CL were included in this study. The gender distribution was almost equal with 38 (51%) males and 37 (49%) females and their ages range from 1 to 80 years with a mean ± SD of 27.89 ± 1.82 years (Table 2). Most patients were of the young age group 31 - 40 (18%), 11 - 20 (17%). All patients in this study had multiple lesions with overall total number of 327.
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Table 1. Sharquie’s modified Leishmania score to assess the objective response to the topical or systemic therapy.
Score 13-16: Mild response. Score 9-12: Moderate response. Score 5-8: Marked response. Score 0-4: Complete response &clearance. Both marked and complete responses are considered as a cure.
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Table 2. Showing demographic features in three groups.
In 17 (22.4%) patients, the lesions were ulcerated while in 51 (68.1%) patients, the lesions were non-ulcerated, in six (8%) patients, the lesions were sporotrichoid while satellite lesions were seen in a single patient.
The most frequently affected site was the lower extremities 27 (36%), followed by face 24 (32%), upper limbs 21 (28%) and trunk (4%).
Patients came from different districts of the Baghdad city while others came from areas surrounding Baghdad including 41 (55%) from Alhusainia town. Family history of CL was positive in 56 (64%) of patients.
Group A: (Zinc sulfate)
A total of 24 patients with 77 lesions were included in this group. The mean duration of lesions of CL was 6.9 ± 0.7 weeks with a range of 4 - 12 weeks and the response to therapy was as follow:
In the baseline first visit, the mean Sharquie’s score was (16.000 ± 0.000 SD).
Two weeks after starting therapy: the mean score of response ± SD was 14.66 ± 1.632, this was statistically significant when compared to the first visit (P value ˂ 0.001), (Table 3).
Four weeks after starting therapy: the mean score of response ± SD was 10.91 ± 3.322, this was statistically significant when compared to the first visit, (P value ˂ 0.000), (Table 3).
Six weeks after starting therapy: mean score of response ± SD was 6.458 ± 5.458, it was statistically significant when compared to the first visit (P value ˂ 0.000) (Table 3).
Regarding the percentage of grade of response in each visit during therapy, they were as follow:
Two weeks after starting therapy:
Twenty two (92%) of the treated patients showed mild improvement, 1 (4%) showed moderate response, 1 (4%) showed marked improvement, (Table 4).
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Table 3. The mean and SD of total score within group A, B and C in each visit.
P = P value. *Paired t test was used to compare base line visit with other visits.
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Table 4. Showing grade of response to treatment in group A, B, C.
Four weeks after starting therapy: Eleven (46%) of the treated patients showed mild improvement, 11 (46%) showed moderate response and only 1 (4%) showed complete response, (Table 4).
Six weeks after starting therapy:
Mild response was seen in 6 (25%) of patients, moderate response in 4 (12%), marked response in 1 (4%) patient while complete response in 13 (58%) patients and so the cure rate was (60%), (Table 4).
Wet and dry lesions responded equally well on this treatment. Apart from gastric upset, nausea and vomiting no appreciable side effects were noted. After healing, the scar was minimal or absent but post inflammatory hyperpigmentation was noted in all patients.
Group B: (Ketoconazole)
A total of 24 patients with 105 lesions were included in this group. The mean duration of lesions of CL was 6.5 ± 0.8weeks with a range of 4 - 12 weeks and the response was as follow:
In the baseline first visit the mean score of response ± SD was (16.000 ± 0.000), (Table 3).
Two weeks after starting therapy: the mean score of response ± SD was 15.00 ± 0.000, this was statistically significant when compared to the first visit (P value ˂ 0.001), (Table 3).
Four weeks after starting therapy: mean score of response ± SD was 13.35 ± 1.886; this was statistically significant when compared to the first visit, P value ˂ 0.001, (Table 3).
Six weeks after starting therapy: mean score of response ± SD was 8.208 ± 3.787, it was statistically significant when compared to the first visit (P value ˂ 0.000), (Table 3).
Regarding the percentage of grade of response in each visit during therapy, were as follow:
Two weeks after starting therapy: Twenty four (100%) of the patient showed only mild improvement (Table 4).
Four weeks after starting therapy: Fifteen (63%) showed mild response and 9 (38%) showed moderate response, (Table 4).
Six weeks after starting therapy: Twelve (50%) of the patients showed mild response 6 (25%) showed marked response, and 6 (25%) showed complete response, this makes the cure rate 12 (50%), (Table 4).
Wet and dry lesions responded equally with this treatment. Four (5%) patients suffered from fatigue. After healing, the scar was minimal while post inflammatory hyperpigmentation was noticed in all patients.
Group C: Combination
A total of 27 patients with 143 lesions were included in this group. The mean duration of lesions of CL was 7.00 ± 0.75 weeks with a range of 4 - 12 weeks and the response was as follow:
In the baseline first visit the mean score of response ± SD was (16.000 ± 0.000), (Table 3).
Two weeks after starting therapy: the mean score of response ± SD was 11.740 ± 2.395; this was statistically significant when compared to the first visit (P value < 0.000), (Table 3).
Four weeks after starting therapy: mean score of response ± SD was 6.481 ± 3.501; this was statistically significant when compared to the first visit, (P value < 0.000), (Table 3).
Six weeks after starting therapy: mean score of response ± SD was 2.074 ± 2.302, it was statistically significant when compared to the first visit (P value < 0.000), (Table 3), (Figure 1).
Regarding the percentage of grade of response in each visit during therapy, were as follow:
Two weeks after starting therapy: Twenty (74%) of the patients showed mild response, and 7 (26%) showed moderate response (Table 4).
Four weeks after starting therapy: One (4%) showed complete clearance, 13 (48%) showed marked response (Table 4).
Six weeks after starting therapy: one patient was mildly improved, 7 (26%) showed marked response and 19 (70%) of the patients showed complete response and most of the lesions were completely healed and thus the cure rate was (96%), (Table 4). Both wet and dry lesions responded similarly. There was minimal scarring but post-inflammatory was seen in all patients. In all groups, smear for Leishmania parasite were negative when taken from healed lesions. Ketocanazole had been used in the study both in single and in combination in 51 patients, during therapy there was no clinical signs and symptoms of systemic side effects. Laboratory tests showed liver enzyme elevation in 4% of patients in the combination group after one month of treatment, this does not need stopping the treatment then the laboratory tests return to normal value after one month.
4. Comparison between Groups
In comparison between zinc sulfate and combination therapy regarding the percentage of grade of response, there was no significant statistical difference at 2 week (P value = 0.402) but there was significant statistical
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Figure 1. Showing the decline in the mean score after 6 weeks of therapy.
difference at 4 weeks (P value = 0.000). While at six weeks after starting therapy, there was statistical significant difference of (P value = 0.04) (Table 4).
The comparison between ketoconazole and combination group regarding the percentage of grade of response, there were significant statistical differences at 2 weeks (P value = 0.038), 4 weeks (P value = 0.000) and 6 weeks (P value = 0.000) (Table 4).
Regarding the complete response following 6 weeks of starting therapy, it was strongly higher in the combination group 19 (70%) than zinc sulfate group 13 (58%) and ketoconazole Group 6 (25%).
There was a statistically significant difference between groups as determined by one-way ANOVA (F = 9.389, P = 0.000). A Tukey post-hoc test revealed that the time to complete cure at six weeks was statistically significantly lower after taking combination treatment (P = 0.000) course compared to the ketoconazole course and zinc sulfate course (P = 0.04). There were no statistically significant differences between the zinc sulfate and ketoconazole groups (P = 0.146), (Table 4).When the three groups were correlated, all of them showed a marked reduction in the score response but the best one was the combination therapy (Figures 1-4).
5. Discussion
Cutaneous leishmaniasis is a self healing disease, however, spontaneous cure may take several months or even years leaving an ugly scar, hence therapy aims to shorten the duration of lesions and prevent physical and mental scarring [11] .
While systemic treatment for CL is often advised when there are multiple lesions, more than five, or larger than 5 cm2 or lesions near critical areas like the eye or in children who could not be controlled during injection or in patients who refuse local treatment or when resistance to topical treatment is found [19] . The current recommended systemic treatment, which has been in use since 1950s, is parentally administered Pentavalent antimonial compounds. Although, it is effective but they are expensive and may cause serious side effects [11] . Other systemic drugs that were used in treatment of CL like oral allopurinol [20] , amphotericin B [21] , rifampicin [22] , antifungal agent [23] , trimethoprim [24] , levamisole [25] , dapson [26] , and chloroquine [27] .
Thus, the ideal therapy should be rapidly effective, easily administered, non-costly, available at all times, and should have minimal side effects [28] .
Zinc sulfate, elemental or in its various forms (salts), has been used as a therapeutic modality for centuries. Zinc, alone or as an adjuvant, has been found useful in many dermatological infections owing to its modulating actions on macrophage and neutrophil functions, natural killer cell/phagocytic activity, and various inflammatory
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Figure 2. (a) A 45-year-old man with CL before treatment; (b) The same patient after 6 weeks of treatment with (ketoconazole and zinc sulfate).
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Figure 3. (a) A 17-year-old female with CL before treatment; (b) The same patient after 6 weeks of treatment with (ketoconazole and zinc sulfate).
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Figure 4. (a) A 30-year-old female with CL before treatment; (b) The same patient after 6 weeks of treatment with (ketoconazole and zinc sulfate).
cytokines. It is used in the treatment of viral wart [29] , leprosy [30] , acne vulgaris [31] , erosive pustuler psoriasis [32] , seborroeic dermatitis [33] . Zinc also directly affects the enzymatic system of Leishmania parasite [34] , as well as it has the ability of protein precipitation [27] . Zinc is an intracellular signal molecule that plays an important role in improving the function of macrophages, dendrocytes and monocytes and cell-mediated immunity that are in turn effective in body defense against Leishmania [34] . Moreover, zinc is involved in the determination of structural properties of molecules concerned with connection and entry of Leishmania into white blood cells [35] . Zinc also serves as a catalyst for enzymes responsible for DNA replication, gene transcription and RNA and protein synthesis. At the cellular level, zinc is critical for cell survival and affects signal transduction, transcription and replication [36] [37] . In the present work, the cure rate of zinc sulfate group was (60%). Several clinical trials have been conducted by Sharquie et al to evaluate the effect of oral zinc sulfate in treatment of cutaneous leishmaniasis. Their results showed that the rate of cure in the group receiving oral zinc sulfate with 10mg/kg/day dose for 28.3 ± 1.4 days was (96.6%) [5] . While in the present work, the cure rate was 60% within six weeks of therapy and this was statistically significantly different (P value ˂ 0.000). The difference between these two studies could be attributed to different Sharquie’s scores used as the Sharquie’s modified Leishmania sore is more objective than the previous semi objective old Sharquie’s leishmania score [5] .
Ketoconazole is an antifungal drug that interferes with the fungal synthesis of ergosterol, a constituent of fungal cell membranes, as well as certain enzymes. As with all azole antifungal agents, ketoconazole works principally by inhibiting the enzyme cytochrome P450 14-alpha-demethylase (P45014DM) and thus block ergosterol synthesis [38] . Moreover, ketoconazole has an antibacterial effect that coincides with its greater inhibition of the biosynthesis of C-55 isoprenoid alcohol and vitamin K. The phosphorylated derivative of C-55 isoprenoid alcohol has functional importance in the biosynthesis of bacterial cell wall and membrane polymers, and the menaquinone vitamin K plays a role in the electron transport of Gram-positive bacteria. The reduced synthesis of these vital compounds may contribute to the antibacterial activity of ketoconazole [39] . Also it has an anti-inflammatory potential suggested by the known inhibitory effect of ketoconazole on 5-lipoxygenase activity and seems comparable to that of weak steroids [40] . In present study, the cure rate after six weeks oral ketoconazole was 50% which was lower than Alsaleh et al. study [41] , from Kuwait who used a higher oral dose 600 mg/day ketoconazole with cure 60% and oral 800 mg/day ketoconazole with cure rate 66.7% at the end of six weeks of treatment [41] . This diversity of cure rate could be explained by the higher dose of ketoconazole and the different scoring system.
Although single therapies, using oral zinc sulfateor oral ketoconazole, have given a good satisfactory result, yet it encourages us to conduct a study using a combination of both drugs to see whether they have a synergetic or a summation effect. Accordingly, the combination therapy gave a cure rate of 96% and using Tuckey HSD test suggests that this combination hasa synergistic effect.
The cure rate of combination therapy, in the present study was 96% which was comparable with intralesional sodium stiboglugonate with a cure rate reaching to 94% with one or 2 injections [42] , but sodium stiboglugonateis expensive, not available, difficult in storage, and painful [11] . In comparison with azithromycin the cure rate was 85% in a dose (500 - 1000 mg/d, for 2 or 10 days per month, and a maximum of 4 months of treatment [43] . A comparison with dapsone, a study in Kuwait showed that oral dapson (100 - 150 mg daily) gives 43.8% cure rate as monotherapy which is too low when compared with present study [44] . In Saudi Arabia, fluconazole (200 mg/d for 6 weeks) at the 3-month follow-up the cure rate was 59% but this drug is also expensive and the cure rate is too low [45] , but comparable with oral ketoconazole (50%) used in the present work.
The therapeutic use of combination of zinc sulfate and ketoconazole provide a solution for the rapid development of resistance and drug to drug interaction in currently new emerging antifungal drugs, they work in a synergistic way by:
1) The blockage of ergosterol biosynthesis done by ketoconazole could be enhanced by the use of zinc sulfate [38] .
2) Antileishmania activity of ketocanazole by its ability to disrupt protozoa membrane transport by blocking the proton pump could be enhanced by the use of zinc sulfate [33] .
3) The anti leishmanial effect of zinc by inhibiting the enzymes that are important for the parasite carbohydrate metabolism and virulence [36] [37] , also the increase in intracelluar zinc content of cells results in cell death, G1 and G2/M cell cycle arrest and increased apoptotic fraction [46] . All This could be enhanced by ketoconazole.
Oral zinc sulfate or oral ketoconazole can be used in combination with topical therapy like topical 25% zinc sulfate solution [47] or topical 25% podophyllin [16] in order to have a higher cure rate.
6. Conclusion
In conclusion, the present work has proven that using oral zinc sulfate or oral ketoconazole drugs can give satisfactory results while the combination of both drugs gives a high cure rate of (96%) in patients with CL. We suggest making a combination tablet of zinc sulfate and ketoconazole to be used in the treatment of CL.
Disclosure
This study was an independent study and not funded by any drug companies.
NOTES
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*Corresponding author.