{"id":8,"date":"2025-01-14T20:46:54","date_gmt":"2025-01-14T20:46:54","guid":{"rendered":"https:\/\/student.wp.odu.edu\/rward009\/?p=8"},"modified":"2025-04-24T19:41:14","modified_gmt":"2025-04-24T19:41:14","slug":"e-portfolio","status":"publish","type":"post","link":"https:\/\/student.wp.odu.edu\/rward009\/2025\/01\/14\/e-portfolio\/","title":{"rendered":"e-Portfolio"},"content":{"rendered":"\n
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I chose this meme because it highlights two important aspects of studying cell biology. First, it emphasizes how much content there truly is beyond the well-known \u201cmitochondria is the powerhouse of the cell\u201d phrase. While that line has become something of a biology clich\u00e9, the meme points out that there\u2019s a much broader and deeper body of knowledge involved. It serves as a reminder that biology isn\u2019t just about memorizing catchphrases\u2014it requires a thorough understanding of complex systems, processes, and interactions within the cell.<\/p>\n\n\n\n

The second reason I felt this meme was fitting is that it captures the effort that goes into preparing for challenging science exams. The quote \u201cYears of academy training wasted!\u201d reflects the frustration that can come when you study intensely, only to find the test covers material you didn\u2019t expect. It\u2019s a relatable feeling for students in any rigorous course, and it highlights how detailed and specific science exams can be. This meme captures the experience of realizing just how much there is to master in a subject like cell biology\u2014and how easy it is to underestimate that until you\u2019re deep in it.<\/p>\n\n\n\n

Literary Deep Dive<\/strong><\/p>\n\n\n\n

Cardiac arrest is a sudden and life-threatening event where the heart stops functioning properly, causing breathing and consciousness to cease almost immediately. In the United States, approximately 356,000 out-of-hospital cardiac arrests occur each year, which accounts for about 0.1% of the population (American Heart Association, 2025). Cardiac arrest is commonly associated with risk factors such as coronary artery disease, arrhythmias, heart failure, hypertension, diabetes, and lifestyle choices like smoking, obesity, and physical inactivity. Unfortunately, the survival rate for out-of-hospital cardiac arrest remains below 10%, making it a critical public health concern (American Heart Association, 2025). A significant complication associated with cardiac arrest is ischemia-reperfusion injury. Ischemia occurs when blood flow to tissues is restricted, depriving cells of oxygen and essential nutrients. When blood flow is restored, known as reperfusion, the sudden influx of oxygen can paradoxically cause additional damage rather than repair. This results from oxidative stress, where reactive oxygen species (ROS) damage cellular structures, particularly mitochondria, leading to potential cell death. The heart is especially vulnerable due to its high energy needs and sensitivity to oxidative damage.<\/p>\n\n\n\n

An emerging area of research aimed at combating ischemia-reperfusion injury is intercellular mitochondrial transfer. This process involves the transfer of healthy mitochondria from donor cells to damaged cells, promoting recovery and restoring cellular function. Mitochondrial transfer can occur through mechanisms such as tunneling nanotubes, microvesicles, or direct cell-to-cell contact (Islam et al., 2012). The concept of mitochondrial transplantation presents a novel approach to repairing damaged cells and enhancing recovery following ischemic injury. The feasibility of mitochondrial transplant lies in the unique characteristics of mitochondria, which possess their own DNA and the ability to replicate independently within cells. Introducing healthy mitochondria to damaged cells could enhance ATP production, reduce oxidative stress, and improve cellular survival. Studies involving heart tissue have shown that transplanted mitochondria can successfully integrate and boost cellular metabolism (Cowan et al., 2020).<\/p>\n\n\n\n

Understanding how cardiac arrest, ischemia-reperfusion injury, and mitochondrial transfer are connected could offer new strategies for treating heart attacks and related conditions. If researchers can establish safe and effective methods for mitochondrial transplantation, it could potentially revolutionize cardiac care by providing a way to promote faster recovery and reduce long-term tissue damage. This innovative approach holds promise for improving survival rates and overall recovery outcomes for patients affected by cardiac arrest and ischemia-related injuries.<\/p>\n\n\n\n

The research by Hayashida et al. (2023) provides strong evidence that mitochondria can be successfully transplanted into brain cells after cardiac arrest and remain functional. The researchers first tested this by measuring ATP production, which is essential for cellular energy. Freshly isolated mitochondria produced significantly more ATP than frozen-thawed mitochondria or vehicle controls (Figure 2A), showing that they maintained metabolic activity. In addition, the membrane potential of the mitochondria, an important marker of mitochondrial health, was higher in the fresh-mito group. This was shown using JC-1 dye, where a greater percentage of mitochondria showed red fluorescence, indicating they were energized and intact (Figure 2B). These results confirm that freshly isolated mitochondria remain active and viable after transplantation.<\/p>\n\n\n\n

Importantly, this mitochondrial functionality translated into better recovery after cardiac arrest. The animals that received fresh mitochondria had a significantly higher survival rate in the 72 hours following cardiac arrest compared to the other two groups (Figure 3A). Neurological function was also better preserved in these animals, as shown by higher Neurological Function Scores (Figure 3B). Since brain injury is a major consequence of cardiac arrest, this improvement suggests that the mitochondria helped protect or restore neural tissue. These findings support previous research indicating that mitochondrial therapy may reduce damage and enhance recovery after ischemic events (McCully et al., 2016).<\/p>\n\n\n\n

Fresh mitochondrial transplantation also helped normalize several important physiological markers. Arterial lactate levels were lower after resuscitation in the fresh-mito group (Figure 4A), which suggests improved oxygen delivery and cellular metabolism. Lung water content, a measure of pulmonary edema, was also significantly reduced in animals treated with fresh mitochondria (Figure 4B), indicating less injury to the lungs. Together, these findings point to improved tissue recovery and reduced reperfusion damage in multiple organs.<\/p>\n\n\n\n

Cardiac function was another key area of improvement. The left ventricular ejection fraction was preserved in the fresh-mito group (Figure 4C), showing that the heart was pumping more effectively compared to the other groups. Blood pH was more stable in this group as well (Figure 5A), suggesting better acid\u2013base balance. Glucose levels, which tend to spike during metabolic stress, were also more regulated in the fresh-mito group (Figure 5C). While there was no major difference in mean arterial pressure between the groups (Figure 4D), blood flow to the brain was significantly better in the animals that received fresh mitochondria (Figure 7B). Since adequate blood flow to the brain is essential for recovery, this likely contributed to the improved neurological outcomes.<\/p>\n\n\n\n

To determine whether the transplanted mitochondria persisted in the body, the researchers looked at gene expression in the brain and spleen 72 hours after cardiac arrest. They found that genes involved in mitochondrial fusion, such as Opa1, Mfn1, and Mfn2, increased in the fresh-mito group (Figures 6C and 6D). This suggests that the new mitochondria not only remained present but also influenced the cellular environment by promoting mitochondrial repair and network remodeling. These changes may help explain the longer-term benefits observed in organ function and survival (Hayashida et al., 2023; Chan, 2020).<\/p>\n\n\n\n

A major finding from the study is that frozen mitochondria were much less effective. They produced significantly less ATP, showed weaker membrane potential, and had no significant impact on survival or organ function (Figure 2). Even when treated with a chemical to try to restore their activity (CCCP), frozen mitochondria remained ineffective. This is consistent with other studies showing that freeze-thaw cycles damage mitochondrial membranes and impair function (Liu et al., 2021). The results clearly indicate that freshly isolated mitochondria are required for successful transplantation and therapeutic benefit.<\/p>\n\n\n\n

In summary, Hayashida et al. (2023) demonstrate that mitochondrial transplantation using fresh mitochondria can significantly improve outcomes after cardiac arrest. The mitochondria remain functional, support energy production, and contribute to better survival, brain function, and overall physiological health. They even persist in tissues and help promote recovery at the molecular level, while frozen mitochondria, lose their therapeutic ability. This research highlights the promise of mitochondrial transplantation as a potential treatment for ischemic injury and offers insight into the conditions necessary for its success.<\/p>\n\n\n\n

References<\/strong><\/p>\n\n\n\n

American Heart Association. (2025). Heart Disease and Stroke Statistics\u20142025 Update<\/em>. American Heart Association. Retrieved from https:\/\/www.heart.org<\/p>\n\n\n\n

Cowan, D. B., Emani, S. M., & McCully, J. D. (2020). Mitochondrial transplantation for ischemia\/reperfusion injury. Nature Reviews Cardiology, 17<\/em>(6), 375\u2013388. https:\/\/doi.org\/10.1038\/s41569-020-0374-6<\/p>\n\n\n\n

Islam, M. N., Das, S. R., Emin, M. T., Wei, M., Sun, L., Westphalen, K., … & Bhattacharya, J. (2012). Mitochondrial transfer from bone-marrow-derived stromal cells to pulmonary alveoli protects against acute lung injury. Nature Medicine, 18<\/em>(5), 759-765. https:\/\/doi.org\/10.1038\/nm.2736<\/a><\/p>\n\n\n\n

Hayashida, K., Nishikimi, M., Watanabe, H., Fukuda, S., Takahashi, T., Kuwahira, I., … & Yamada, Y. (2023). Transplanted mitochondria after cardiac arrest enhance survival and neurological function by improving brain and systemic metabolism. BMC Medicine, 21<\/em>, 48. https:\/\/doi.org\/10.1186\/s12916-023-02759-0<\/p>\n\n\n\n

McCully, J. D., Levitsky, S., del Nido, P. J., & Cowan, D. B. (2016). Mitochondrial transplantation for therapeutic use. Clinical and Translational Medicine, 5<\/em>(1), 16. https:\/\/doi.org\/10.1186\/s40169-016-0094-1<\/p>\n\n\n\n

Chan, D. C. (2020). Mitochondrial dynamics and its involvement in disease. Annual Review of Pathology: Mechanisms of Disease, 15<\/em>, 235\u2013259. https:\/\/doi.org\/10.1146\/annurev-pathmechdis-012419-032711Liu, C. S., Cheng, W. L., Lee, C. F., Ma, Y. S., Lin, Y. F., & Wei, Y. H. (2021). Oxidative damage and mitochondrial DNA mutations in human cells after freeze-thaw cycles. Free Radical Biology and Medicine, 172<\/em>, 205\u2013213. https:\/\/doi.org\/10.1016\/j.freeradbiomed.2021.06.021<\/p>\n\n\n\n

End of Term Reflection<\/strong><\/p>\n\n\n\n

One thing I took away from this cell biology class was how it helped me better connect biology and biochemistry. Before, I understood the two subjects separately, but this course showed me how closely they work together. For example, when we covered enzymes and cell signaling, it helped me understand similar topics in my biochemistry class, like how reactions and pathways actually work in the body. It made things feel more connected and less like just separate sets of facts to memorize. As a biochemistry major, that connection is really important because it helps me see how the chemistry I study applies to real biological systems. This class gave me a better foundation and helped me feel more confident moving forward in my studies.<\/p>\n","protected":false},"excerpt":{"rendered":"

I chose this meme because it highlights two important aspects of studying cell biology. First, it emphasizes how much content there truly is beyond the well-known \u201cmitochondria is the powerhouse of the cell\u201d phrase. While that line has become something… Continue Reading →<\/a><\/p>\n","protected":false},"author":30290,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","wds_primary_category":3},"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/student.wp.odu.edu\/rward009\/wp-json\/wp\/v2\/posts\/8"}],"collection":[{"href":"https:\/\/student.wp.odu.edu\/rward009\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/student.wp.odu.edu\/rward009\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/student.wp.odu.edu\/rward009\/wp-json\/wp\/v2\/users\/30290"}],"replies":[{"embeddable":true,"href":"https:\/\/student.wp.odu.edu\/rward009\/wp-json\/wp\/v2\/comments?post=8"}],"version-history":[{"count":5,"href":"https:\/\/student.wp.odu.edu\/rward009\/wp-json\/wp\/v2\/posts\/8\/revisions"}],"predecessor-version":[{"id":29,"href":"https:\/\/student.wp.odu.edu\/rward009\/wp-json\/wp\/v2\/posts\/8\/revisions\/29"}],"wp:attachment":[{"href":"https:\/\/student.wp.odu.edu\/rward009\/wp-json\/wp\/v2\/media?parent=8"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/student.wp.odu.edu\/rward009\/wp-json\/wp\/v2\/categories?post=8"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/student.wp.odu.edu\/rward009\/wp-json\/wp\/v2\/tags?post=8"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}