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Homeopathy – cancer – pets – the holistic vet –


We are happy to bring here a published research about the use of Homeopathy Condurango in cancer human patients. We also use it in the treatment of our pets in the clinic.

Post-cancer Treatment with Condurango 30C Shows Amelioration of Benzo[a]pyrene-induced Lung Cancer in Rats Through the Molecular Pathway of Caspa- se-3-mediated Apoptosis Induction

-Anti-lung cancer potential of Condurango 30C in rats-



The present investigation aimed at examining if post-cancer treatment with a potentized homeopathic drug, Condurango 30C, which is generally used to treat oesophageal cancer, could also show an ameliorating effect through apoptosis induction on lung cancer induced by benzo[a]pyrene (BaP) in white rats (Rattus norvegicus).


Lung cancer was induced after four months by chronic feeding of BaP to rats through gavage at a dose of 50 mg/kg body weight for one month. After four months, the lung-cancer-bearing rats were treated with Condurango 30C for the next one (5th), two (5th-6th) and three (5th-7th) months, respectively, and were sacrificed at the corresponding time- points. The ameliorating effect, if any, after Condurango 30C treatment for the various periods was evaluated by using protocols such as histology, scanning electron microscopy (SEM), annexinV-FITC/PI assay, flow cytometry of the apoptosis marker, DNA fragmentation, reverse transcriptase-polymerase chain reaction (RT-PCR), immunohistochemistry, and western blot analyses of lung tissue samples.


Striking recovery of lung tissue to a near normal status was noticed after post-cancerous drug treatment, as evidenced by SEM and histology, especially after one and two months of drug treatment. Data from the annexinV-FITC/PI and DNA fragmentation assays revealed that Condurango 30C could induce apoptosis in cancer cells after post-cancer treatment. A critical analysis of signalling cascade, evidenced through a RT-PCR study, demonstrated up-regulation and down-regulation of different pro- and anti-apoptotic genes, respectively, related to a caspase-3-mediated apoptotic pathway, which was especially discernible after one-month and two- month drug treatments. Correspondingly, Western blot and immunohistochemistry studies confirmed the ameliorative potential of Condurango 30C by its ability to down-regulate the elevated epidermal growth factor receptor (EGFR) expression, a hallmark of lung cancer.


The overall result validated a positive effect of Condurango 30C in ameliorating lung cancer through caspase-3-mediated apoptosis induction and EGFR down-regulation.

Keywords: apoptosis, benzo[a]pyrene (BaP), caspase-3, Condurango 30C, homeopathy, lung cancer

1. Introduction

Lung cancer is a leading cause of death worldwide. Among different types of lung cancers, non-small-cell lung cancer (NSCLC) is the most common type (85%) [1]. Cigarette smoking is the primary cause of lung cancer. Benzo[ a]pyrene (BaP) is a prototype of the polycyclic aromatic hydrocarbons (PAHs) found in cigarette smoke; it induces lung tumors [2]. BaP can increase cell proliferation and DNA adduct formation to induce lung cancer [3]. Surgical resection is the only treatment for patients with stage I or II NSCLC whereas patients with later stages are treated with combinations of surgery, chemotherapy, and radiation therapy, all of which have significant side effects [4].

Apart from conventional therapies, complementary and alternative medicines (CAMs) are now being used to combat cancer because of their lesser toxic side effects [5]. Homeopathic medicines are being used as major alternatives for various ailments, including cancer. Earlier we reported the anti-cancer potentials of different potentized homeopathic drugs like Chelidonium 30C and Lycopodium 30C in ameliorating hepato-carcinogenesis in mice [67] and of Lycopodium 5C and 15C against HeLa cells in vitro[8].

Most anti-cancer therapeutic agents exert their effect by inducing apoptosis, necrosis, and/or autophagy in cancer cells [9]. Apoptosis is characterized by several cellular changes, including formation of plasma membrane blebbing, chromatin condensation and DNA fragmentation. The members of the Bcl-2 family are central regulators of the intrinsic apoptotic pathway that governs mitochondrial outer membrane permeabilization, the release of cytochrome-c, and the activations of apaf-1, caspase-9, -3, and poly (ADP-ribose) polymerase (PARP) [10].

The homeopathic drug Marsdenia condurango(commonly called Condurango) is generally used against esophageal cancer [11]. Dried bark is the main source for Condurango ethanolic extracts. Condurango was first introduced to treat stomach cancer and syphilis in the United States in 1871 [12], but no detailed reports on the efficacy of the homeopathic drug Condurango and its potentized forms for treating neoplastic lung cancer exist. Hence, the present study was undertaken to examine if the potentized form of Condurango, Condurango 30C, could induce apoptotic cell death in BaP-induced lung cancer in rats in vivo.

2. Materials and Methods

2.1. Experimental animals

Inbred healthy white Wistar rats (Rattus norvegicus) weighing between 80 g and 90 g were reared in the animal house of the Department of Zoology, Kalyani University, West Bengal, India, under proper hygienic condition in polypropylene cages (temperature: 24 ± 2℃; humidity: 55 ± 5%; 12-h light/dark cycles) and were allowed free drinking water and basal dietad libitum. Ethical clearance was obtained from the Institutional Ethical Committee, University of Kalyani.

2.2. Study design

A randomized set of 42 rats was used for each time-point. Each set of rats was sub-divided into 7 different groups consisting of 6 rats in each group:

Group 1, Normal: animals received food and waterad libitum without any supplementation,

Group 2, olive-oil fed: animals received normal food and water supplemented with olive oil (solvent of BaP),

Group 3, placebo fed: normal animals received a drug vehicle (30% ethyl alcohol as a placebo) orally once daily for 1, 2 and 3 months, respectively, after cancer development in BaP-fed rats,

Group 4, only drug-treated: normal animals received Condurango 30C orally once daily for 1, 2 and 3 months, respectively, after four months of cancer development,

Group 5, Carcinogen (BaP)-treated: animals received BaP orally 2 days (Tuesday and Friday) a week for 1 month and then a normal diet and water,

Group 6, BaP+placebo-treated: animals received a placebo orally once daily for 1, 2 and 3 months, respectively, after development of lung cancer,

Group 7, BaP+Condurango 30C-treated: animals received Condurango 30C orally once daily for 1, 2 and 3 months, respectively, after development of lung cancer.

The experimental data were collected after 1 (5th ), 2 (6th ) and 3 (7th ) months to investigate the possible efficacy of Condurango 30C. At the ends of the experimental periods, the animals were sacrificed humanely by cervical dislocation.

2.3. Preparations and administrations of BaP and Condurango 30C

BaP (dissolved in olive oil) at a dose of 50 mg/kg body weight was fed to each rat through gavage [4]. Condurango 30C was supplied by Boiron Laboratory, Lyon, France. One ml of Condurango 30C was diluted with 20 ml of double- distilled water to make the stock solution, and each rat was fed 0.06 ml orally from the stock at a time with the aid of a fine pipette [13].

2.4. Scanning electron microscopy (SEM) and histology of lung

Lung samples were fixed with 2.5% glutaraldehyde, dehydrated with graded acetone (50%-100%) and observed by using an S530-Hitachi SEM instrument (Department of University Science Instrumentation Centre, Burdwan University) after gold coating [14]. Formalin-fixed lung sections (5μm) from each group were stained with hematoxylin- eosin double staining [15] and were evaluated by using a light microscope.

2.5. Lung cell perfusion, annexinV-FITC/PI, DNA fragmentation, and caspase-3 activation assays

The lung tissues were minced within 2% Roswell Park Memorial Institute-1640 media (Himedia, India), and the lung epithelial cells were flushed gently using a hypodermic syringe. The media-containing cells were spun down at 1,000 G, and the supernatant-containing lung epithelial cells were used for further study [14].

The rate of apoptosis of the perfused cells (3 x 107 cells/ well) was assessed by using AnnexinV- fluorescein isothiocyanate/ propidium iodide (FITC/PI) through flow cytometry (FACS Callibur, BD Bioscience, USA) [16]. DNA was extracted by using the conventional phenol–chloroform method, was separated in 2% agarose gel and was visualized under an UV transilluminator. Perfused lung cells were incubated with caspase-3 primary and FITC-tagged secondary antibodies (Santa Cruz Biotechnology, USA). Caspase-3 (Cas-3) activity was analyzed by using flow cytometry (Callibur, BD Bioscience, USA).

2.6. Preparation of lung and liver tissue homogenates and semi-quantitative reverse transcriptase-polymerase chain reaction (RT-PCR)

Lung and liver tissues were homogenized, and homogenates were collected after centrifugation [16]. Total RNA was extracted from each lung by using trizol (Himedia, India), and expressions of different apoptotic genes were analyzed by using semi-quantitative RT-PCR [17]. The primer sequences are presented in (Table (Table1)1) The band intensities were analyzed densitometrically by using Image J software (Germany).

Table. 1

Primer names and sequences
Primer names Primer sequences

2.7. Localization of protein distribution by immunohistochemistry and analysis of protein expression by using a Western blot

An immunohistochemical study was performed [18] with caspase-3 and epidermal growth factor receptor (EGFR) primary antibodies and HRP-conjugated secondary antibodies (Santa Cruz Biotechnology, USA). Haematoxylin was used to counterstain for observation under a light microscope (Leica, Germany).

The expressions of EGFR and PARP1 were analyzed by using Western blots [16]. The band intensities were analyzed densitometrically by using Image J software (Germany).

2.8. Statistical analysis

Data were analyzed, and the significance of the differences between the mean values was determined by using the one-way analysis of variance (ANOVA) with Fisher’s least significant difference (LSD) post-hoc tests with the SPSS 14 software (SPSS Inc, Chicago, IL, USA). Statistical significance was considered at *P< 0.05.

3. Results

3.1. SEM and histology of lung

The typical tissue arrangement was observed in the normal lung, but architectural distortion of the pulmonary microvasculature with narrow alveolar spaces was observed in a cancerous lung, which gradually increased with time. Noticeably, alveolar spaces gradually became broader, specifically at the 5th and the 6th month fixation intervals of drug treatment, thus indicating the tissue damage-repair activity of Condurango 30C (Fig (Fig11 A, B, C).

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Scanning electron microscopy of rat lungs of different groups [(A) and (B)]. (A) [200X] (i) and (B) [500X] (viii) – untreated control group with regular tissue rearrangement, (A) [200X] (ii)-(iv) and (B) [500X] (ix)-(xi) – BaP-induced cancerous groups at 5th, 6th and 7th month intervals, respectively, where alveolar spaces were narrowing, (A) [200X] (v)-(vii) and (B) [500X] (xii)-(xiv) – Condurango-30C-treated groups at 5th, 6th and 7th month intervals, respectively. (C) Histological sections of rat lungs (40X): (i) normal lung section, (ii)-(iv) BaP-induced lung sections at 5th, 6th and 7th months and (v)-(vii) Condurango-30C-treated lung sections at 5th, 6th and 7th month intervals, respectively.

3.2. AnnexinV-FITC/PI assay

Apoptotic cell death is accompanied by surface exposure of phosphatidylserine (PS) in the plasma membrane, which can be detected by using AnnexinV. Fig Fig22 A-1 reveals a time-dependent increase of apoptosis, especially at the 5th and the 6th month fixation intervals. Percentages of cells are shown in Fig. Fig.22 A-2 table. Standard deviations (Fig. 2A-3) of early and late apoptosis clearly demonstrate the percentages of cells that undergo apoptosis.

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(A-1) Flow cytometric analysis of perfused lung cells by using annexin V-FITC/PI. (i) normal, (ii)-(iv) BaP-induced lung cancer at 5th, 6th and 7th month intervals (Cancer1, Cancer2, Cancer3) and (v)-(vii) BaP+Condurango 30C treated groups at 5th, 6th and 7th month intervals (30_1, 30_2, 30_3), respectively. Live cells are denoted as `Live’, early apoptosis is denoted by `Early’, late apoptosis is signified by `Late’ and PI positive cells (dead cells) is denoted by Q1. FL1H- filter of annexin V -FITC and FL2H- filter of PI. Table (2A-2) and graphical representation (2A-3) below give the apoptosis percentages. (B) DNA fragmentation of rat lung DNA of different groups. (i) Fragmented DNA (L3) occurred after Condurango- 30C treatment at 5th month interval, whereas cancerous DNA sample (L2) became slightly smeared. (ii) Representation of the increase in the DNA fragmentation (L5) after Condurango-30C treatment at the 6th month interval, whereas the cancerous DNA (L4) showed increased smearing. (iii) A slight decrease in the DNA fragmentation (L7) after Condurango-30C treatment with increased smearing of cancerous DNA (L6) at the 7th month interval. L1- is normal DNA.

3.3. DNA fragmentation

DNA-smearing was found in cancerous lung samples at the three-month time point. However, a gradual increase in DNA fragmentation was observed in drug-treated groups, especially at the 5th and the 6th month intervals, indicating the cells’ journey towards apoptosis (Fig (Fig22 B).

3.4. Caspase-3 activation

Fig Fig33 A shows an increased level of caspase-3 after post-cancerous-drug treatment, specifically at the 5th and the 6th month intervals, which may suggest that a time-bound action of the drug to increase the caspase-3 activation in cancerous lungs remains maximal, at least, in the first two-month interval, to trigger apoptosis. The standard deviation of the caspase-3 activation (Fig (Fig33 B) supports the conclusion stated above.

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Evaluation of caspase-3 activation by flow cytometric analysis: (A) (i) normal, (ii)-(iv) BaP-induced lung cancers at 5th, 6th and 7th month intervals, and (v)-(vii) BaP+Condurango-30C-treated groups at 5th, 6th and 7th month intervals, respectively. M1 denotes the percentage of cells showing caspase-3 activation. (B) Standard deviations are represented graphically.

3.5. Semi-quantitative RT-PCR and localization of protein distribution by immunohistochemistry

RT-PCR results confirmed a significant difference in the expressions of different pro- and anti-apoptotic genes between normal and cancerous and between cancerous and drug-treated groups, especially at the 5th and the 6th month time points. (Fig (Fig44 A, B, C). Appearance of caspase-3, indicated by black spots in drug treated sections, demonstrated caspase-3-mediated apoptosis induction, especially at the 5th and the 6th month intervals (Fig (Fig55 A).

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RT-PCR analysis of different pro- and anti-apoptotic genes: (A) L1-normal, L2-cancer, L3-Condurango-30C treatment (after 5th month); (B) L1-normal, L4-cancer, L5- Condurango-30C treatment (after 6th month) and the histograms of relative band intensities of RT-PCR bands; (C) L1-normal, L6-cancer, L7-Condurango-30C treatment (after 7th month) and histograms of relative band intensities of RT-PCR bands. The results shown in histograms are the averages ± SDs; n = 6. Significance * P< 0.05 normal vs. cancer (5th(A), 6th(B) & 7th(C) month intervals) and normal vs. Condurango-30C treatment (5th, 6th& 7th month intervals), † P< 0.05 cancer (5th, 6th& 7th month intervals) vs Condurango-30C treatment (5th, 6th& 7th month intervals).

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Immunohistochemical studies of (A) caspase-3 and (B) EGFR: (A) (i) normal lung section, (ii)-(iv) BaP-induced lung sections at 5th, 6th and 7th month intervals, respectively, where caspase-3 expression was not found, (v)-(vii) Condurango-30C- treated lung sections at 5th, 6th and 7th month intervals, respectively, where the caspase-3 localization was found, especially at 5th and 6th month intervals, indicated by black spots with arrows; (B) (i) normal lung section, (ii)-(iv) BaP induced lung sections at 5th, 6th and 7th month intervals, respectively, where EGFR over-expression was clearly visible (denoted by black spots with arrows), and (v)-(vii) Condurango-30C-treated lung sections at 5th, 6th and 7th month intervals, respectively, where the downregulation of EGFR was found, especially at 5th and 6th month time-points.

EGFR is normally over-expressed in 80% NSCLC [19]. Figure 5B clearly shows a decreased level of EGFR expression after drug treatment, especially at the 5th and the 6th months, but a dramatic increase at the 7th month, indicating that the drug did not ameliorate cancerous progression during the last month interval, possibly due to excessive growth of lung tumors.

3.6. Protein expression by-Western blot

We found a more decreased expression of EGFR in drug-treated lung proteins than in cancerous samples, especially at the 5th and the 6th month fixation intervals, which supported the immunohistochemical data. Thus, Condurango 30C further proved to have anti-EGFR activity in NSCLC by inhibiting uncontrolled cell growth (Figs. 6A, B, C).

The increased expression of PARP1 is indicative of cells undergoing apoptosis (Fig (Fig6)A,6)A, B, C). At the 6th month interval of drug treatment, although the PARP1 expression was slightly low, formation of PARP1 cleavage further supported the apoptosis-inducing activity of the drugin vivo.

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Western blot analyses of PARP1 and EGFR. (A) L1-normal, L2-cancer, and L3-Condurango-30C-treated (after 5th month). (B) L4-cancer and L5-Condurango-30C-treated (after 6th month). (C) L6-cancer and L7-Condurango-30C-treated (after 7th month). The relative band intensities shown in the histograms are averages ± SDs; n = 6. Significance * P< 0.05 normal vs. cancer (5th(A), 6th(B) & 7th(C) month intervals) and normal vs. Condurango-30C treatment (5th, 6th& 7th month intervals); P< 0.05 cancer (5th, 6th& 7th month intervals) vs. Condurango-30C treatment (5th, 6th& 7th month intervals).

4. Discussion

The ultra-highly-diluted remedies, particularly those exceeding Avogadro’s limit, have been claimed [20] to have beneficial and curative effects against disease/disease symptoms. Therefore, the positive effects against cancer found in this study are very important. Further, the remedy demonstrates sufficient efficacy when administered after the complete development of cancer in an animal model.

The hallmark of most anti-cancer drugs is the induction of apoptosis in cancer cells, which are otherwise immortal and ever-growing in nature. However, most anti-cancer drugs used in orthodox therapy are highly toxic and have undesirable side effects, largely precluding their use in all cancer patients. Therefore, any drug that can be used in a low and tolerable dose without any side-effects is highly sought in cancer therapy because it can also be used as a supportive therapy if needed. Herein lies the novelty of this ultra-highly-diluted remedy that also demonstrated an unquestionable ability to induce apoptosis in cancer cells with positive recovery of cancerous lungs back to their near normal states in rats, particularly at the 5th and the 6th month intervals. The present study seems to be the first one that convincingly demonstrates the anticancer potentials of Condurango 30C in BaP-induced lung cancer in rats through a multitude of scientific protocols. The recovery due to post-treatment with Condurango 30C in this study was quite remarkable.

One of the hallmarks of apoptosis is internucleosomal DNA breakdown or fragmentation. Formation of DNA laddering suggested the ability of Condurango 30C to induce apoptosis, which was further supported by AnnexinV- FITC/PI dual staining data, especially at the 5th and the 6th month fixation intervals. Multiple apoptotic stimuli trigger caspase-3 activation, which initiates and executes apoptosis. Our experimental data support the activation of caspase-3 based on flow cytometry, RT-PCR and immunohistochemical analysis after post-cancerous drug treatment, and represent a positive signal towards caspase-3-mediated apoptosis. The key events involved in caspase-3-mediated apoptosis are up-regulation of Bax and down-regulation of Bcl2 [21]. Increased and decreased expressions of Bax and Bcl2, respectively, lead to loss of mitochondrial membrane potential (MMP), which induces apoptosis via cytochrome-c release. RT-PCR analysis indicates decreased Bcl2 and increased Bax levels after treatment with Condurango 30C, especially at the 5th and the 6th month intervals. Furthermore, Condurango 30C treatment leads to the activation of cytochrome-c, caspase-3, caspase-9, apaf-1 and PARP1, especially at the 5th and the 6th month intervals. PARP1 is important to trigger apoptosis in the caspase-3-mediated pathway. Increased levels of PARP1 were found at the 5th and the 6th month fixation intervals, especially the formation of PARP1 cleavage at the 6th month, depicting further that the cells were undergoing apoptosis.

EGFR expression was found to be elevated in cells undergoing proliferative activities, particularly during development of a lung tumor [19]. However, in this study, Condurango 30C inhibited EGFR expression at the 5th and the 6th month of post-cancerous treatment, further lending support to its anti-proliferative activity.

5. Conclusion

Thus, Condurango 30C activated a caspase-3-dependent apoptotic pathway in BaP-induced lung cancer in rats, validating the hypothesis of Khuda-Bukhsh [22 – 23] that potentized homeopathic drugs could act at the molecular level of gene expression as a very probable means to remove disease symptoms.


This work was financially supported by a grant to Prof. Khuda-Bukhsh, Department of Zoology, University of Kalyani, and by Boiron Laboratory, Lyon, France. The authors are thankful to Dr. Chakraborty, University Burdwan, for the SEM measurements and Dr. Mallick, Application Scientist, University of Calcutta, for his guidance during FACS.


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