Introducing Wound Healing Assays in the Undergraduate Biology Laboratory Using Ibidi Plates.

The wound healing assay is a simple and inexpensive method that allows researchers to experimentally mimic cell growth and migration leading to wound healing. In this assay, a wound is created on a monolayer of cultured mammalian cells and cell migration is monitored. Micrographs are captured at regular intervals during the duration of the experiment. These microscopy images are analyzed to compare cell migration and wound closure under different conditions. Introduction of different cytotoxic treatments into a wound healing assay can provide information as to whether a particular drug or compound of interest has the ability to affect cell migration. This type of analysis is important when assessing the ability of a particular cancer cell line to display invasive and metastatic behaviors. One of the challenges of this assay is to create the original wound in a way that is consistent across plates or treatments, facilitating comparisons across experimental groups. This is a particular challenge when using the wound healing assay in the context of an undergraduate biology class to expose students to a distinct form of mammalian cell culture and help them apply scientific knowledge and research skills. We found an easy way to overcome this obstacle by using ibidi plates. In this article, we provide a simple protocol to use ibidi plates and HeLa cells to set up wound healing assays. This laboratory exercise allows undergraduate students to utilize different skills developed through cell culture experience, such as growing, treating, and imaging mammalian cells.

Introducing Mammalian Cell Culture and Cell Viability Techniques in the Undergraduate Biology Laboratory.

Undergraduate students learn about mammalian cell culture applications in introductory biology courses. However, laboratory modules are rarely designed to provide hands-on experience with mammalian cells or teach cell culture techniques, such as trypsinization and cell counting. Students are more likely to learn about cell culture using bacteria or yeast, as they are typically easier to grow, culture, and manipulate given the equipment, tools, and environment of most undergraduate biology laboratories. In contrast, the utilization of mammalian cells requires a dedicated biological safety cabinet and rigorous antiseptic techniques. For this reason, we have devised a laboratory module and method herein that familiarizes students with common cell culture procedures, without the use of a sterile hood or large cell culture facility. Students design and perform a time-efficient inquiry-based cell viability experiment using HeLa cells and tools that are readily available in an undergraduate biology laboratory. Students will become familiar with common techniques such as trypsinizing cells, cell counting with a hemocytometer, performing serial dilutions, and determining cell viability using trypan blue dye. Additionally, students will work with graphing software to analyze their data and think critically about the mechanism of death on a cellular level. Two different adaptations of this inquiry-based lab are presented-one for non-biology majors and one for biology majors. Overall, these laboratories aim to expose students to mammalian cell culture and basic techniques and help them to conceptualize their application in scientific research.