Immune modulating compounds from fungi
The present invention relates to compositions comprising polypeptides and polysaccharides. The compositions are in general immune modulating. The invention also discloses methods of producing these compositions using filamentous fungi cultivated in liquid medium. The compositions are useful for example in the treatment of immune compromised conditions.
1. An isolated, aqueous liquid immune stimulating composition comprising a mixture of polysaccharides comprising the monosaccharide units galactose, mannose and glucose,
wherein: the majority of the polysaccharides of the composition have a molecular weight of at least 1,000 Da wherein a first part of said polysaccharides have a molecular weight of less than 1,000,000 Da, wherein a second part of said polysaccharides have a molecular weight of at least 1,000,000 Da, wherein said mixture of polysaccharides comprises the monosaccharides galactose, mannose and glucose in the ratio 1:0.033 to 500:1 to 50, and wherein the composition is produced by a method comprising the steps of;
a) cultivating a fungus of the genus Lentinus in a liquid growth medium under appropriate conditions to provide a suitable chemical and physical environment supporting the growth of a fungus of the genus Lentinus in the liquid growth medium,
b) isolating the composition from said liquid growth medium by one or more size fractionation steps, and
c) retaining said composition for further use.
2. The composition according to claim 1 , wherein the one or more size fractionation steps comprise a method involving ultracentrifugation, ultrafiltration, microfiltration or gel filtration.
3. The composition according to claim 1 , wherein the fungus of the genus Lentinus is Lentinus edodes.
4. The composition according to claim 1 , wherein the majority of the polysaceharides of the composition have a molecular weight of at least 50,000 Da.
5. The composition according to claim 1 , wherein the majority of the polysaccharides of the composition have a molecular weight of at least 100,000 Da.
6. A method of producing a composition according to claim 1 , said method comprising the steps of
a) cultivating a fungus of the genus Lentinus in a liquid growth medium under appropriate conditions to provide a suitable chemical and physical environment supporting the growth of a fungus of the genus Lentinus in a liquid growth medium, and
b) isolating the composition from said liquid growth medium by one or more size fractionation steps and retaining said composition for further use.
7. The method according to claim 6 , wherein said separation is achieved by a method step comprising ultracentrifugation, ultrafiltration, microfiltration or gel filtration.
8. A pharmaceutical composition comprising the composition according to claim 1 and a pharmaceutically acceptable carrier.
9. A method of treatment of an individual
i) diagnosed with an immune compromised condition; and/or
ii) at risk of contracting an immune compromised condition; and/or
iii) recovering from surgery or illness and at risk of contracting an immune compromised condition; and/or
iv) diagnosed with or at risk of contracting acquired immunodeficiency syndrome,
said method comprising the steps of administering to said individual the composition according to claim 1 in an amount effective in treating said immune compromised condition or said syndrome or effective in boosting the immune system of said individual.
10. A kit comprising the composition according to claim 1 and a dosage regime instruction with guidelines for dose and time administration.