Calf Thymus Polypeptide Restrains the Growth of Colorectal Tumor via Regulating the Intestinal Microbiota-Mediated Immune Function

Lanzhou Li; Chenfei Zhao; Fange Kong; Yi-Cong Li; Chunxia Wang; Shanshan Chen; Hor-Yue Tan; Yang Liu; Di Wang

doi:10.3389/fphar.2022.898906

Calf Thymus Polypeptide Restrains the Growth of Colorectal Tumor via Regulating the Intestinal Microbiota-Mediated Immune Function

Front Pharmacol. 2022 May 19:13:898906. doi: 10.3389/fphar.2022.898906. eCollection 2022.

Authors

Lanzhou Li^{1

2}, Chenfei Zhao¹, Fange Kong¹, Yi-Cong Li¹, Chunxia Wang¹, Shanshan Chen², Hor-Yue Tan³, Yang Liu¹, Di Wang^{1

2}

Affiliations

¹ Engineering Research Center of Chinese Ministry of Education for Edible and Medicinal Fungi, Jilin Agricultural University, Changchun, China.
² School of Life Sciences, Jilin University, Changchun, China.
³ Centre for Chinese Herbal Medicine Drug Development, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.

Abstract

Calf thymus polypeptide (CTP), with a molecular mass of <10 kDa, is prepared from the thymus of less than 30-day-old newborn cattle. In the present study, the inhibitory function of CTP in colorectal cancer (CRC) was investigated in B6/JGpt-Apc ^em1Cin(MinC) /Gpt (Apc ^Min/+) mice. CTP hampered tumor development and enhanced the ratio of CD3e^-NK1.1⁺ cells by 113.0% and CD3e⁺CD28⁺ cells by 84.7% in the peripheral blood of Apc ^Min/+ mice. CTP improved the richness, diversity, and evenness of the intestinal microbiota of Apc ^Min/+ mice, particularly by regulating the abundance of immune-related microorganisms. CTP effectively regulated the expression of immune-related cytokines, such as interleukin (IL)-2 (15.19% increment), IL-12 (17.47% increment), and transforming growth factor (TGF)-β (11.19% reduction). Additionally, it enhanced the levels of CD4 and CD8, as well as the ratio of helper T lymphocytes (Th)1/Th2 in the spleen and tumors of Apc ^Min/+ mice. In CTP-treated mice, reduced levels of programmed death-1 (PD-1), programmed cell death-ligand 1 (PD-L1), cytotoxic T lymphocyte-associated antigen 4 (CTLA4), activated nuclear factor of activated T cells 1 (NFAT1), and nuclear factor κB (NF-κB) p65 signaling were noted. Collectively, the anti-CRC effect of CTP is related to the modulation of intestinal microbiota-mediated immune function, which provides a reference for CTP as a therapeutic drug or a combination drug used in CRC treatment in a clinical setting.

Keywords: NK cells; T cells; calf thymus polypeptide; colorectal cancer; interleukin-2; intestinal microbiota.