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Biomedical Journal of Scientific & Technical Research

March 04, 2020, Volume 26, 5, pp 20291-20293

Mini Review

Mini Review

Inosine Pranobex Enhances Human NK Cell Cytotoxicity in the Treatment of Acute Respiratory Viral Infections Including COVID-19

Jiří Beran*

Author Affiliations

Head Department for Tropical and Travel Medicine, Immunization Institute of Postgraduate Health Education in Prague, Czech Republic

Received: March 09, 2020 | Published: April 01, 2020

Corresponding author: Jiří Beran, Head Department for Tropical and Travel Medicine and Immunization Institute of Postgraduate Health Education in Prague, Director Vaccination and Travel Medicine Centre Tylovo nábřeží 418/6, 500 02 Hradec Králové, Czech Republic

DOI: 10.26717/BJSTR.2020.26.004414

Abstract

The Inosine Pranobex (IP) by stimulating Natural Killers (NK) is effective in the treatment of acute viral respiratory infections and hopefully also against Covid-19. IP is a synthetic compound with immunomodulatory and antiviral properties. It is authorized since 1971 in more than 70 countries worldwide for the treatment of many different viral diseases. In one of the recent studies, the authors proved that the NK cells population increased within 90 min of IP receiving and by Day 5, the level was double. In another study, the authors showed that IP via metabolic activation influences NKG2D ligand induction, leading to increased NKG2D‐dependent target cell immunogenicity. In the past, IP was used to treat measles and measles pneumonia. One of the very old studies was shown that IP treatment of measles was significantly better in the prevention of lethal course of measles infection. In a recent clinical study, we compared the efficacy in subjects with laboratory-confirmed acute respiratory viral infections. Time to resolution (in subgroups) of all influenza-like symptoms between treatment groups was statistically significant with faster clinical improvement in the IP group. The knowledge of IP antiviral activity can be used for the treatment of Covid-19 as an acute viral disease. In the elderly, who are immunosenescenced and for people with a significant chronic disease the standard dose can be 1g (2 tablets)/4 times per day for 7-14 days or 2 days after symptoms resolution.
Keywords: Inosine Pranobex; Natural Killers; Acute Respiratory Viral Infection; Treatment; Covid-19

Mini Review

Clinical and immunological research which was performed during past 5 years can explain the very effective role of Inosine Pranobex (IP) and Natural Killers (NK) in treatment of the majority of viral infections hopefully also against Covid-19 as one of the currently spread acute viral respiratory infection. Inosine pranobex (IP), commonly known as inosine acedoben dimepranol, isoprinosine or methisoprinol, is a synthetic compound with immunomodulatory and antiviral properties. The drug was initially authorized in 1971. IP is currently marketed in more than 70 countries worldwide for the treatment of viral diseases, including subacute sclerosing panencephalitis (SSPE), herpes simplex virus (HSV) and varicella infections, human papillomavirus (HPV), cytomegalovirus and Epstein–Barr virus infections, acute viral respiratory infections, measles, and immunosuppressed states [1]. IP affects via NK almost all the viruses that replicate in the human body. As authors pointed out in their publication, studies with IP demonstrate that the immunomodulatory activity of IP is characterized by enhanced lymphocyte proliferation, cytokine production, and NK cell cytotoxicity [2]. In detail, all the immunomodulatory activity are described in the publication of Slíva [1].

In one of the recent studies [3], the authors proved that after IP administration was an early and durable rise in NK cells. For half the cohort, NK cells increased as a percentage of total peripheral blood lymphocytes within 1.5 h of receiving the IP. By Day 5, all but one of the volunteers displayed higher NK cell percentages, such elevation – effectively a doubling or greater – was maintained at the termination of the study. The IP induced populations were as replete in Granzyme A and Perforin as basal NK cells [3]. The authors of the study [2] show a more detailed influence of the IP on cellular level. They show that exposure of target cells to IP leads to increased expression of multiple NKG2D ligands. They found that IP causes an increase in intracellular concentration of purine nucleotides and tricarboxylic acid (TCA) cycle intermediates and NKG2D ligand induction. The degree of NKG2D ligand induction was functionally significant, leading to increased NKG2D‐dependent target cell immunogenicity. These findings demonstrate that the immunomodulatory properties of IP are due to metabolic activation with NKG2D ligand induction [2]. Approximately 40 years ago when the measles vaccine was not available, IP was used to treat measles, resp. primary measles pneumonia. One of the very old studies was shown that IP treatment of measles was significantly better in the prevention of lethal course of measles infection (Table 1) [4]. Today, such a study cannot be repeated because most children are vaccinated and the number of primary measles pneumonia can be counted on the fingers of one hand in one country in a certain time period. Nevertheless, this information about the treatment of measles and primary measles pneumonia can be also supportive for use in the treatment of complicated cases of Covid-19.

Table 1: Analysis of 200 hospitalised children and half of them treated with IP for measles infection.

Note: IP treatment 100mg/kg/weight is statistically significant (0.05 < p < 0.025) in prevention of lethal course of measles

Figure 1: Faster improvement in subjects in the Inosine pranobex (IP) group compared with subjects in the placebo group. Note: Time to resolution was the total number of days from randomisation to the first instance at which all influenza-like symptoms had a score of 0

In the subgroup analysis, for subjects, less than 50 years of age without related ongoing disease, the difference in time to resolution of all influenza-like symptoms between treatment groups was statistically significant (p = 0.050) and showed faster improvement in subjects in the IP group compared with subjects in the placebo group (Figure 1) [8]. The novel clinical and laboratory findings of IP activity can be in this context used as a treatment option (off-label in some countries) for at least some cases of infection during the current pandemic of Covid-19 with standard treatment schedule for young and otherwise healthy people 1g (2 tablets)/3 times per day up to 50 tablets. In the elderly, who are immunosenescenced and for people with a significant chronic disease the standard dose can be increased to 1g (2 tablets)/4 times per day for 7-14 days or 2 days after symptoms resolution. It is obvious that boosting phenotypically competent NK cells in healthy individuals supports the IP’s indicated benefit in conditions associated with any acute viral respiratory infection and reinforces the potential for uplift where immune performance may be compromised [3,8].

References

Mini Review

Inosine Pranobex Enhances Human NK Cell Cytotoxicity in the Treatment of Acute Respiratory Viral Infections Including COVID-19

Jiří Beran*

Author Affiliations

Head Department for Tropical and Travel Medicine, Immunization Institute of Postgraduate Health Education in Prague, Czech Republic

Received: March 09, 2020 | Published: April 01, 2020

Corresponding author: Jiří Beran, Head Department for Tropical and Travel Medicine and Immunization Institute of Postgraduate Health Education in Prague, Director Vaccination and Travel Medicine Centre Tylovo nábřeží 418/6, 500 02 Hradec Králové, Czech Republic

DOI: 10.26717/BJSTR.2020.26.004414

Abstract

The Inosine Pranobex (IP) by stimulating Natural Killers (NK) is effective in the treatment of acute viral respiratory infections and hopefully also against Covid-19. IP is a synthetic compound with immunomodulatory and antiviral properties. It is authorized since 1971 in more than 70 countries worldwide for the treatment of many different viral diseases. In one of the recent studies, the authors proved that the NK cells population increased within 90 min of IP receiving and by Day 5, the level was double. In another study, the authors showed that IP via metabolic activation influences NKG2D ligand induction, leading to increased NKG2D‐dependent target cell immunogenicity. In the past, IP was used to treat measles and measles pneumonia. One of the very old studies was shown that IP treatment of measles was significantly better in the prevention of lethal course of measles infection. In a recent clinical study, we compared the efficacy in subjects with laboratory-confirmed acute respiratory viral infections. Time to resolution (in subgroups) of all influenza-like symptoms between treatment groups was statistically significant with faster clinical improvement in the IP group. The knowledge of IP antiviral activity can be used for the treatment of Covid-19 as an acute viral disease. In the elderly, who are immunosenescenced and for people with a significant chronic disease the standard dose can be 1g (2 tablets)/4 times per day for 7-14 days or 2 days after symptoms resolution.
Keywords: Inosine Pranobex; Natural Killers; Acute Respiratory Viral Infection; Treatment; Covid-19