molecules Review Plant-Based Indole Alkaloids: A Comprehensive Overview from a Pharmacological Perspective Faisal Omar 1, Abu Montakim Tareq 1 , Ali M. Alqahtani 2 , Kuldeep Dhama 3 , Mohammed Abu Sayeed 1,*, Talha Bin Emran 4,* and Jesus Simal-Gandara 5,* 1 Department of Pharmacy, International Islamic University Chittagong, Chittagong 4318, Bangladesh;
[email protected] (F.O.);
[email protected] (A.M.T.) 2 Department of Pharmacology, College of Pharmacy, King Khalid University, Abha 62529, Saudi Arabia;
[email protected] 3 Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, Uttar Pradesh, India;
[email protected] 4 Department of Pharmacy, BGC Trust University Bangladesh, Chittagong 4381, Bangladesh 5 Nutrition and Bromatology Group, Department of Analytical and Food Chemistry, Faculty of Food Science and Technology, University of Vigo—Ourense Campus, E32004 Ourense, Spain * Correspondence:
[email protected] (M.A.S.);
[email protected] (T.B.E.);
[email protected] (J.S.-G.); Tel.: +88-0-167-041-9435 (M.A.S.); +88-0-181-994-2214 (T.B.E.); +34-988-387000 (J.S.-G.) Abstract: Plant-based indole alkaloids are very rich in pharmacological activities, and the indole nu- cleus is considered to contribute greatly to these activities. This review’s fundamental objective is to summarize the pharmacological potential of indole alkaloids that have been derived from plants and provide a detailed evaluation of their established pharmacological activities, which may contribute to Citation: Omar, F.; Tareq, A.M.; identifying new lead compounds. The study was performed by searching various scientific databases, Alqahtani, A.M.; Dhama, K.; Sayeed, including Springer, Elsevier, ACS Publications, Taylor and Francis, Thieme, Wiley Online Library, M.A.; Emran, T.B.; Simal-Gandara, J.