Immunochemical identification of the mammalian peptide hormone obestatin from tea plant (Camellia sinensis)

Calapoğlu M., Temizyürek İ., İlhan İ., Çiçek E., Kumbul Doğuç D., Şahin U.

PAKISTAN JOURNAL OF PHARMACEUTICAL SCIENCES, vol.36, no.1, pp.199-204, 2023 (SCI-Expanded)


This study determines obestatin-like substances from the young shoots of the tea plant [Camellia sinensis (L.) O. Kuntze (Theaceae)]. Proteins were extracted from the vegetative tea leaves using the QB (Quick Buffer) buffer as an extraction buffer. Obestatin-like substances in tea extract were investigated using an indirect home-made enzyme-linked immunosorbent assay (ELISA). Human obestatin-like immunoreactive substances from tea extract were isolated and characterized by tricine-sodium dodecyl sulfate-polyacrylamide gel electrophoresis (tricine-SDS-PAGE) and immunoblotting techniques. Immunochemical results showed that there are strong human obestatin-like immunoreactive substances (0.048 ± 0.0064 ng/mg protein) in vegetative tea leaves. This finding was completely unexpected since this hormone was considered to be present solely in animals. Furthermore, a single obestatin-like immunoreactive protein band of 13 kDa was identified by tricine-SDS-PAGE and Western blotting of extract of vegetative tea leaf proteins. Present investigation is the first report of presence of obestatin-like immunoreactive substances in plants. It is concluded that obestatin-like bioactive peptides derived from plants can affect gastrointestinal tract structures as endogenous obestatin does and hence play a role in appetite regulation and body weight gain.